History of BS 1806
AS568 Size Chart
Master O-Ring Size Chart
BS 1806 is the British imperial O-Ring dash system. In practice it tracks the same family
of sizes as AS568 , which is why UK and US spares often interchange when the dash matches.
Jump:
0xx series
1xx series
2xx series
3xx series
4xx series
9xx series
Additional BS 1806 sizes
6.99 mm CS sizes Dash codes follow the AS568-style series. Cross-check AS568 when the print uses either name.
492 sizes · BS 1806
0xx series 50 sizes
BS 1806 0xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -001 BS1806-001 1/32 1/32 0.029 ±.004 0.040 ±.003 0.109 0.74 ±0.10 1.02 ±0.08 2.78 -002 BS1806-002 3/64 3/64 0.042 ±.004 0.050 ±.003 0.142 1.07 ±0.10 1.27 ±0.08 3.61 -003 BS1806-003 1/16 1/16 0.056 ±.004 0.060 ±.003 0.176 1.42 ±0.10 1.52 ±0.08 4.46 -004 BS1806-004 5/64 1/16 0.070 ±.005 0.070 ±.003 0.210 1.78 ±0.13 1.78 ±0.08 5.34 -005 BS1806-005 3/32 1/16 0.101 ±.005 0.070 ±.003 0.241 2.57 ±0.13 1.78 ±0.08 6.13 -006 BS1806-006 1/8 1/16 0.114 ±.005 0.070 ±.003 0.254 2.90 ±0.13 1.78 ±0.08 6.46 -007 BS1806-007 5/32 1/16 0.145 ±.005 0.070 ±.003 0.285 3.68 ±0.13 1.78 ±0.08 7.24 -008 BS1806-008 3/16 1/16 0.176 ±.005 0.070 ±.003 0.316 4.47 ±0.13 1.78 ±0.08 8.03 -009 BS1806-009 7/32 1/16 0.208 ±.005 0.070 ±.003 0.348 5.28 ±0.13 1.78 ±0.08 8.84 -010 BS1806-010 1/4 1/16 0.239 ±.005 0.070 ±.003 0.379 6.07 ±0.13 1.78 ±0.08 9.63 -011 BS1806-011 5/16 1/16 0.301 ±.005 0.070 ±.003 0.441 7.65 ±0.13 1.78 ±0.08 11.21 -012 BS1806-012 3/8 1/16 0.364 ±.005 0.070 ±.003 0.504 9.25 ±0.13 1.78 ±0.08 12.81 -013 BS1806-013 7/16 1/16 0.426 ±.005 0.070 ±.003 0.566 10.82 ±0.13 1.78 ±0.08 14.38 -014 BS1806-014 1/2 1/16 0.489 ±.005 0.070 ±.003 0.629 12.42 ±0.13 1.78 ±0.08 15.98 -015 BS1806-015 9/16 1/16 0.551 ±.007 0.070 ±.003 0.691 14.00 ±0.18 1.78 ±0.08 17.56 -016 BS1806-016 5/8 1/16 0.614 ±.009 0.070 ±.003 0.754 15.60 ±0.23 1.78 ±0.08 19.16 -017 BS1806-017 11/16 1/16 0.676 ±.009 0.070 ±.003 0.816 17.17 ±0.23 1.78 ±0.08 20.73 -018 BS1806-018 3/4 1/16 0.739 ±.009 0.070 ±.003 0.879 18.77 ±0.23 1.78 ±0.08 22.33 -019 BS1806-019 13/16 1/16 0.801 ±.009 0.070 ±.003 0.941 20.35 ±0.23 1.78 ±0.08 23.91 -020 BS1806-020 7/8 1/16 0.864 ±.009 0.070 ±.003 1.004 21.95 ±0.23 1.78 ±0.08 25.51 -021 BS1806-021 15/16 1/16 0.926 ±.009 0.070 ±.003 1.066 23.52 ±0.23 1.78 ±0.08 27.08 -022 BS1806-022 1 1/16 0.989 ±.010 0.070 ±.003 1.129 25.12 ±0.25 1.78 ±0.08 28.68 -023 BS1806-023 1-1/16 1/16 1.051 ±.010 0.070 ±.003 1.191 26.70 ±0.25 1.78 ±0.08 30.26 -024 BS1806-024 1-1/8 1/16 1.114 ±.010 0.070 ±.003 1.254 28.30 ±0.25 1.78 ±0.08 31.86 -025 BS1806-025 1-3/16 1/16 1.176 ±.011 0.070 ±.003 1.316 29.87 ±0.28 1.78 ±0.08 33.43 -026 BS1806-026 1-1/4 1/16 1.239 ±.011 0.070 ±.003 1.379 31.47 ±0.28 1.78 ±0.08 35.03 -027 BS1806-027 1-5/16 1/16 1.301 ±.011 0.070 ±.003 1.441 33.05 ±0.28 1.78 ±0.08 36.61 -028 BS1806-028 1-3/8 1/16 1.364 ±.013 0.070 ±.003 1.504 34.65 ±0.33 1.78 ±0.08 38.21 -029 BS1806-029 1-1/2 1/16 1.489 ±.013 0.070 ±.003 1.629 37.82 ±0.33 1.78 ±0.08 41.38 -030 BS1806-030 1-5/8 1/16 1.614 ±.013 0.070 ±.003 1.754 41.00 ±0.33 1.78 ±0.08 44.56 -031 BS1806-031 1-3/4 1/16 1.739 ±.015 0.070 ±.003 1.879 44.17 ±0.38 1.78 ±0.08 47.73 -032 BS1806-032 1-7/8 1/16 1.864 ±.015 0.070 ±.003 2.004 47.35 ±0.38 1.78 ±0.08 50.91 -033 BS1806-033 2 1/16 1.989 ±.018 0.070 ±.003 2.129 50.52 ±0.46 1.78 ±0.08 54.08 -034 BS1806-034 2-1/8 1/16 2.114 ±.018 0.070 ±.003 2.254 53.70 ±0.46 1.78 ±0.08 57.26 -035 BS1806-035 2-1/4 1/16 2.239 ±.018 0.070 ±.003 2.379 56.87 ±0.46 1.78 ±0.08 60.43 -036 BS1806-036 2-3/8 1/16 2.364 ±.018 0.070 ±.003 2.504 60.05 ±0.46 1.78 ±0.08 63.61 -037 BS1806-037 2-1/2 1/16 2.489 ±.018 0.070 ±.003 2.629 63.22 ±0.46 1.78 ±0.08 66.78 -038 BS1806-038 2-5/8 1/16 2.614 ±.020 0.070 ±.003 2.754 66.40 ±0.51 1.78 ±0.08 69.96 -039 BS1806-039 2-3/4 1/16 2.739 ±.020 0.070 ±.003 2.879 69.57 ±0.51 1.78 ±0.08 73.13 -040 BS1806-040 2-7/8 1/16 2.864 ±.020 0.070 ±.003 3.004 72.75 ±0.51 1.78 ±0.08 76.31 -041 BS1806-041 3 1/16 2.989 ±.024 0.070 ±.003 3.129 75.92 ±0.61 1.78 ±0.08 79.48 -042 BS1806-042 3-1/4 1/16 3.239 ±.024 0.070 ±.003 3.379 82.27 ±0.61 1.78 ±0.08 85.83 -043 BS1806-043 3-1/2 1/16 3.489 ±.024 0.070 ±.003 3.629 88.62 ±0.61 1.78 ±0.08 92.18 -044 BS1806-044 3-3/4 1/16 3.739 ±.027 0.070 ±.003 3.879 94.97 ±0.69 1.78 ±0.08 98.53 -045 BS1806-045 4 1/16 3.989 ±.027 0.070 ±.003 4.129 101.32 ±0.69 1.78 ±0.08 104.88 -046 BS1806-046 4-1/4 1/16 4.239 ±.030 0.070 ±.003 4.379 107.67 ±0.76 1.78 ±0.08 111.23 -047 BS1806-047 4-1/2 1/16 4.489 ±.030 0.070 ±.003 4.629 114.02 ±0.76 1.78 ±0.08 117.58 -048 BS1806-048 4-3/4 1/16 4.739 ±.030 0.070 ±.003 4.879 120.37 ±0.76 1.78 ±0.08 123.93 -049 BS1806-049 5 1/16 4.989 ±.037 0.070 ±.003 5.129 126.72 ±0.94 1.78 ±0.08 130.28 -050 BS1806-050 5-1/4 1/16 5.239 ±.037 0.070 ±.003 5.379 133.07 ±0.94 1.78 ±0.08 136.63
1xx series 77 sizes
BS 1806 1xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -102 BS1806-102 1/16 3/32 0.049 ±.005 0.103 ±.003 0.255 1.24 ±0.13 2.62 ±0.08 6.48 -103 BS1806-103 3/32 3/32 0.081 ±.005 0.103 ±.003 0.287 2.06 ±0.13 2.62 ±0.08 7.30 -104 BS1806-104 1/8 3/32 0.112 ±.005 0.103 ±.003 0.318 2.84 ±0.13 2.62 ±0.08 8.08 -105 BS1806-105 5/32 3/32 0.143 ±.005 0.103 ±.003 0.349 3.63 ±0.13 2.62 ±0.08 8.87 -106 BS1806-106 3/16 3/32 0.174 ±.005 0.103 ±.003 0.380 4.42 ±0.13 2.62 ±0.08 9.66 -107 BS1806-107 7/32 3/32 0.206 ±.005 0.103 ±.003 0.412 5.23 ±0.13 2.62 ±0.08 10.47 -108 BS1806-108 1/4 3/32 0.237 ±.005 0.103 ±.003 0.443 6.02 ±0.13 2.62 ±0.08 11.26 -109 BS1806-109 5/16 3/32 0.299 ±.005 0.103 ±.003 0.505 7.59 ±0.13 2.62 ±0.08 12.83 -110 BS1806-110 3/8 3/32 0.362 ±.005 0.103 ±.003 0.568 9.19 ±0.13 2.62 ±0.08 14.43 -111 BS1806-111 7/16 3/32 0.424 ±.005 0.103 ±.003 0.630 10.77 ±0.13 2.62 ±0.08 16.01 -112 BS1806-112 1/2 3/32 0.487 ±.005 0.103 ±.003 0.693 12.37 ±0.13 2.62 ±0.08 17.61 -113 BS1806-113 9/16 3/32 0.549 ±.007 0.103 ±.003 0.755 13.94 ±0.18 2.62 ±0.08 19.18 -114 BS1806-114 5/8 3/32 0.612 ±.009 0.103 ±.003 0.818 15.54 ±0.23 2.62 ±0.08 20.78 -115 BS1806-115 11/16 3/32 0.674 ±.009 0.103 ±.003 0.880 17.12 ±0.23 2.62 ±0.08 22.36 -116 BS1806-116 3/4 3/32 0.737 ±.009 0.103 ±.003 0.943 18.72 ±0.23 2.62 ±0.08 23.96 -117 BS1806-117 13/16 3/32 0.799 ±.010 0.103 ±.003 1.005 20.30 ±0.25 2.62 ±0.08 25.54 -118 BS1806-118 7/8 3/32 0.862 ±.010 0.103 ±.003 1.068 21.89 ±0.25 2.62 ±0.08 27.13 -119 BS1806-119 15/16 3/32 0.924 ±.010 0.103 ±.003 1.130 23.47 ±0.25 2.62 ±0.08 28.71 -120 BS1806-120 1 3/32 0.987 ±.010 0.103 ±.003 1.193 25.07 ±0.25 2.62 ±0.08 30.31 -121 BS1806-121 1-1/16 3/32 1.049 ±.010 0.103 ±.003 1.255 26.64 ±0.25 2.62 ±0.08 31.88 -122 BS1806-122 1-1/8 3/32 1.112 ±.010 0.103 ±.003 1.318 28.24 ±0.25 2.62 ±0.08 33.48 -123 BS1806-123 1-3/16 3/32 1.174 ±.012 0.103 ±.003 1.380 29.82 ±0.30 2.62 ±0.08 35.06 -124 BS1806-124 1-1/4 3/32 1.237 ±.012 0.103 ±.003 1.443 31.42 ±0.30 2.62 ±0.08 36.66 -125 BS1806-125 1-5/16 3/32 1.299 ±.012 0.103 ±.003 1.505 32.99 ±0.30 2.62 ±0.08 38.23 -126 BS1806-126 1-3/8 3/32 1.362 ±.012 0.103 ±.003 1.568 34.59 ±0.30 2.62 ±0.08 39.83 -127 BS1806-127 1-7/16 3/32 1.424 ±.012 0.103 ±.003 1.630 36.17 ±0.30 2.62 ±0.08 41.41 -128 BS1806-128 1-1/2 3/32 1.487 ±.012 0.103 ±.003 1.693 37.77 ±0.30 2.62 ±0.08 43.01 -129 BS1806-129 1-9/16 3/32 1.549 ±.015 0.103 ±.003 1.755 39.34 ±0.38 2.62 ±0.08 44.58 -130 BS1806-130 1-5/8 3/32 1.612 ±.015 0.103 ±.003 1.818 40.94 ±0.38 2.62 ±0.08 46.18 -131 BS1806-131 1-11/16 3/32 1.674 ±.015 0.103 ±.003 1.880 42.52 ±0.38 2.62 ±0.08 47.76 -132 BS1806-132 1-3/4 3/32 1.737 ±.015 0.103 ±.003 1.943 44.12 ±0.38 2.62 ±0.08 49.36 -133 BS1806-133 1-13/16 3/32 1.799 ±.015 0.103 ±.003 2.005 45.69 ±0.38 2.62 ±0.08 50.93 -134 BS1806-134 1-7/8 3/32 1.862 ±.015 0.103 ±.003 2.068 47.30 ±0.38 2.62 ±0.08 52.54 -135 BS1806-135 1-15/16 3/32 1.925 ±.017 0.103 ±.003 2.131 48.90 ±0.43 2.62 ±0.08 54.14 -136 BS1806-136 2 3/32 1.987 ±.017 0.103 ±.003 2.193 50.47 ±0.43 2.62 ±0.08 55.71 -137 BS1806-137 2-1/16 3/32 2.050 ±.017 0.103 ±.003 2.256 52.07 ±0.43 2.62 ±0.08 57.31 -138 BS1806-138 2-1/8 3/32 2.112 ±.017 0.103 ±.003 2.318 53.64 ±0.43 2.62 ±0.08 58.88 -139 BS1806-139 2-3/16 3/32 2.175 ±.017 0.103 ±.003 2.381 55.25 ±0.43 2.62 ±0.08 60.49 -140 BS1806-140 2-1/4 3/32 2.237 ±.017 0.103 ±.003 2.443 56.82 ±0.43 2.62 ±0.08 62.06 -141 BS1806-141 2-5/16 3/32 2.300 ±.020 0.103 ±.003 2.506 58.42 ±0.51 2.62 ±0.08 63.66 -142 BS1806-142 2-3/8 3/32 2.362 ±.020 0.103 ±.003 2.568 59.99 ±0.51 2.62 ±0.08 65.23 -143 BS1806-143 2-7/16 3/32 2.425 ±.020 0.103 ±.003 2.631 61.60 ±0.51 2.62 ±0.08 66.84 -144 BS1806-144 2-1/2 3/32 2.487 ±.020 0.103 ±.003 2.693 63.17 ±0.51 2.62 ±0.08 68.41 -145 BS1806-145 2-9/16 3/32 2.550 ±.020 0.103 ±.003 2.756 64.77 ±0.51 2.62 ±0.08 70.01 -146 BS1806-146 2-5/8 3/32 2.612 ±.020 0.103 ±.003 2.818 66.34 ±0.51 2.62 ±0.08 71.58 -147 BS1806-147 2-11/16 3/32 2.675 ±.022 0.103 ±.003 2.881 67.95 ±0.56 2.62 ±0.08 73.19 -148 BS1806-148 2-3/4 3/32 2.737 ±.022 0.103 ±.003 2.943 69.52 ±0.56 2.62 ±0.08 74.76 -149 BS1806-149 2-13/16 3/32 2.800 ±.022 0.103 ±.003 3.006 71.12 ±0.56 2.62 ±0.08 76.36 -150 BS1806-150 2-7/8 3/32 2.862 ±.022 0.103 ±.003 3.068 72.69 ±0.56 2.62 ±0.08 77.93 -151 BS1806-151 3 3/32 2.987 ±.024 0.103 ±.003 3.193 75.87 ±0.61 2.62 ±0.08 81.11 -152 BS1806-152 3-1/4 3/32 3.237 ±.024 0.103 ±.003 3.443 82.22 ±0.61 2.62 ±0.08 87.46 -153 BS1806-153 3-1/2 3/32 3.487 ±.024 0.103 ±.003 3.693 88.57 ±0.61 2.62 ±0.08 93.81 -154 BS1806-154 3-3/4 3/32 3.737 ±.028 0.103 ±.003 3.943 94.92 ±0.71 2.62 ±0.08 100.16 -155 BS1806-155 4 3/32 3.987 ±.028 0.103 ±.003 4.193 101.27 ±0.71 2.62 ±0.08 106.51 -156 BS1806-156 4-1/4 3/32 4.237 ±.030 0.103 ±.003 4.443 107.62 ±0.76 2.62 ±0.08 112.86 -157 BS1806-157 4-1/2 3/32 4.487 ±.030 0.103 ±.003 4.693 113.97 ±0.76 2.62 ±0.08 119.21 -158 BS1806-158 4-3/4 3/32 4.737 ±.030 0.103 ±.003 4.943 120.32 ±0.76 2.62 ±0.08 125.56 -159 BS1806-159 5 3/32 4.987 ±.035 0.103 ±.003 5.193 126.67 ±0.89 2.62 ±0.08 131.91 -160 BS1806-160 5-1/4 3/32 5.237 ±.035 0.103 ±.003 5.443 133.02 ±0.89 2.62 ±0.08 138.26 -161 BS1806-161 5-1/2 3/32 5.487 ±.035 0.103 ±.003 5.693 139.37 ±0.89 2.62 ±0.08 144.61 -162 BS1806-162 5-3/4 3/32 5.737 ±.035 0.103 ±.003 5.943 145.72 ±0.89 2.62 ±0.08 150.96 -163 BS1806-163 6 3/32 5.987 ±.035 0.103 ±.003 6.193 152.07 ±0.89 2.62 ±0.08 157.31 -164 BS1806-164 6-1/4 3/32 6.237 ±.040 0.103 ±.003 6.443 158.42 ±1.02 2.62 ±0.08 163.66 -165 BS1806-165 6-1/2 3/32 6.487 ±.040 0.103 ±.003 6.693 164.77 ±1.02 2.62 ±0.08 170.01 -166 BS1806-166 6-3/4 3/32 6.737 ±.040 0.103 ±.003 6.943 171.12 ±1.02 2.62 ±0.08 176.36 -167 BS1806-167 7 3/32 6.987 ±.040 0.103 ±.003 7.193 177.47 ±1.02 2.62 ±0.08 182.71 -168 BS1806-168 7-1/4 3/32 7.237 ±.045 0.103 ±.003 7.443 183.82 ±1.14 2.62 ±0.08 189.06 -169 BS1806-169 7-1/2 3/32 7.487 ±.045 0.103 ±.003 7.693 190.17 ±1.14 2.62 ±0.08 195.41 -170 BS1806-170 7-3/4 3/32 7.737 ±.045 0.103 ±.003 7.943 196.52 ±1.14 2.62 ±0.08 201.76 -171 BS1806-171 8 3/32 7.987 ±.045 0.103 ±.003 8.193 202.87 ±1.14 2.62 ±0.08 208.11 -172 BS1806-172 8-1/4 3/32 8.237 ±.050 0.103 ±.003 8.443 209.22 ±1.27 2.62 ±0.08 214.46 -173 BS1806-173 8-1/2 3/32 8.487 ±.050 0.103 ±.003 8.693 215.57 ±1.27 2.62 ±0.08 220.81 -174 BS1806-174 8-3/4 3/32 8.737 ±.050 0.103 ±.003 8.943 221.92 ±1.27 2.62 ±0.08 227.16 -175 BS1806-175 9 3/32 8.987 ±.050 0.103 ±.003 9.193 228.27 ±1.27 2.62 ±0.08 233.51 -176 BS1806-176 9-1/4 3/32 9.237 ±.055 0.103 ±.003 9.443 234.62 ±1.40 2.62 ±0.08 239.86 -177 BS1806-177 9-1/2 3/32 9.487 ±.055 0.103 ±.003 9.693 240.97 ±1.40 2.62 ±0.08 246.21 -178 BS1806-178 9-3/4 3/32 9.737 ±.055 0.103 ±.003 9.943 247.32 ±1.40 2.62 ±0.08 252.56
2xx series 84 sizes
BS 1806 2xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -201 BS1806-201 3/16 1/8 0.171 ±.005 0.139 ±.004 0.449 4.34 ±0.13 3.53 ±0.10 11.40 -202 BS1806-202 1/4 1/8 0.234 ±.005 0.139 ±.004 0.512 5.94 ±0.13 3.53 ±0.10 13.00 -203 BS1806-203 5/16 1/8 0.296 ±.005 0.139 ±.004 0.574 7.52 ±0.13 3.53 ±0.10 14.58 -204 BS1806-204 3/8 1/8 0.359 ±.005 0.139 ±.004 0.637 9.12 ±0.13 3.53 ±0.10 16.18 -205 BS1806-205 7/16 1/8 0.421 ±.005 0.139 ±.004 0.699 10.69 ±0.13 3.53 ±0.10 17.75 -206 BS1806-206 1/2 1/8 0.484 ±.005 0.139 ±.004 0.762 12.29 ±0.13 3.53 ±0.10 19.35 -207 BS1806-207 9/16 1/8 0.546 ±.007 0.139 ±.004 0.824 13.87 ±0.17 3.53 ±0.10 20.93 -208 BS1806-208 5/8 1/8 0.609 ±.009 0.139 ±.004 0.887 15.47 ±0.23 3.53 ±0.10 22.53 -209 BS1806-209 11/16 1/8 0.671 ±.009 0.139 ±.004 0.949 17.04 ±0.23 3.53 ±0.10 24.10 -210 BS1806-210 3/4 1/8 0.734 ±.010 0.139 ±.004 1.012 18.64 ±0.25 3.53 ±0.10 25.70 -211 BS1806-211 13/16 1/8 0.796 ±.010 0.139 ±.004 1.074 20.22 ±0.25 3.53 ±0.10 27.28 -212 BS1806-212 7/8 1/8 0.859 ±.010 0.139 ±.004 1.137 21.82 ±0.25 3.53 ±0.10 28.88 -213 BS1806-213 15/16 1/8 0.921 ±.010 0.139 ±.004 1.199 23.39 ±0.25 3.53 ±0.10 30.45 -214 BS1806-214 1 1/8 0.984 ±.010 0.139 ±.004 1.262 25.00 ±0.25 3.53 ±0.10 32.06 -215 BS1806-215 1-1/16 1/8 1.046 ±.010 0.139 ±.004 1.324 26.57 ±0.25 3.53 ±0.10 33.63 -216 BS1806-216 1-1/8 1/8 1.109 ±.012 0.139 ±.004 1.387 28.17 ±0.30 3.53 ±0.10 35.23 -217 BS1806-217 1-3/16 1/8 1.171 ±.012 0.139 ±.004 1.449 29.74 ±0.30 3.53 ±0.10 36.80 -218 BS1806-218 1-1/4 1/8 1.234 ±.012 0.139 ±.004 1.512 31.34 ±0.30 3.53 ±0.10 38.40 -219 BS1806-219 1-5/16 1/8 1.296 ±.012 0.139 ±.004 1.574 32.92 ±0.30 3.53 ±0.10 39.98 -220 BS1806-220 1-3/8 1/8 1.359 ±.012 0.139 ±.004 1.637 34.52 ±0.30 3.53 ±0.10 41.58 -221 BS1806-221 1-7/16 1/8 1.421 ±.012 0.139 ±.004 1.699 36.09 ±0.30 3.53 ±0.10 43.15 -222 BS1806-222 1-1/2 1/8 1.484 ±.015 0.139 ±.004 1.762 37.69 ±0.38 3.53 ±0.10 44.75 -223 BS1806-223 1-5/8 1/8 1.609 ±.015 0.139 ±.004 1.887 40.87 ±0.38 3.53 ±0.10 47.93 -224 BS1806-224 1-3/4 1/8 1.734 ±.015 0.139 ±.004 2.012 44.04 ±0.38 3.53 ±0.10 51.10 -225 BS1806-225 1-7/8 1/8 1.859 ±.018 0.139 ±.004 2.137 47.22 ±0.46 3.53 ±0.10 54.28 -226 BS1806-226 2 1/8 1.984 ±.018 0.139 ±.004 2.262 50.39 ±0.46 3.53 ±0.10 57.45 -227 BS1806-227 2-1/8 1/8 2.109 ±.018 0.139 ±.004 2.387 53.57 ±0.46 3.53 ±0.10 60.63 -228 BS1806-228 2-1/4 1/8 2.234 ±.020 0.139 ±.004 2.512 56.74 ±0.50 3.53 ±0.10 63.80 -229 BS1806-229 2-3/8 1/8 2.359 ±.020 0.139 ±.004 2.637 59.92 ±0.50 3.53 ±0.10 66.98 -230 BS1806-230 2-1/2 1/8 2.484 ±.020 0.139 ±.004 2.762 63.09 ±0.50 3.53 ±0.10 70.15 -231 BS1806-231 2-5/8 1/8 2.609 ±.020 0.139 ±.004 2.887 66.27 ±0.50 3.53 ±0.10 73.33 -232 BS1806-232 2-3/4 1/8 2.734 ±.024 0.139 ±.004 3.012 69.44 ±0.61 3.53 ±0.10 76.50 -233 BS1806-233 2-7/8 1/8 2.859 ±.024 0.139 ±.004 3.137 72.62 ±0.61 3.53 ±0.10 79.68 -234 BS1806-234 3 1/8 2.984 ±.024 0.139 ±.004 3.262 75.79 ±0.61 3.53 ±0.10 82.85 -235 BS1806-235 3-1/8 1/8 3.109 ±.024 0.139 ±.004 3.387 78.97 ±0.61 3.53 ±0.10 86.03 -236 BS1806-236 3-1/4 1/8 3.234 ±.024 0.139 ±.004 3.512 82.14 ±0.61 3.53 ±0.10 89.20 -237 BS1806-237 3-3/8 1/8 3.359 ±.024 0.139 ±.004 3.637 85.32 ±0.61 3.53 ±0.10 92.38 -238 BS1806-238 3-1/2 1/8 3.484 ±.024 0.139 ±.004 3.762 88.49 ±0.61 3.53 ±0.10 95.55 -239 BS1806-239 3-5/8 1/8 3.609 ±.028 0.139 ±.004 3.887 91.67 ±0.71 3.53 ±0.10 98.73 -240 BS1806-240 3-3/4 1/8 3.734 ±.028 0.139 ±.004 4.012 94.84 ±0.71 3.53 ±0.10 101.90 -241 BS1806-241 3-7/8 1/8 3.859 ±.028 0.139 ±.004 4.137 98.02 ±0.71 3.53 ±0.10 105.08 -242 BS1806-242 4 1/8 3.984 ±.028 0.139 ±.004 4.262 101.19 ±0.71 3.53 ±0.10 108.25 -243 BS1806-243 4-1/8 1/8 4.109 ±.028 0.139 ±.004 4.387 104.37 ±0.71 3.53 ±0.10 111.43 -244 BS1806-244 4-1/4 1/8 4.234 ±.030 0.139 ±.004 4.512 107.54 ±0.76 3.53 ±0.10 114.60 -245 BS1806-245 4-3/8 1/8 4.359 ±.030 0.139 ±.004 4.637 110.72 ±0.76 3.53 ±0.10 117.78 -246 BS1806-246 4-1/2 1/8 4.484 ±.030 0.139 ±.004 4.762 113.89 ±0.76 3.53 ±0.10 120.95 -247 BS1806-247 4-5/8 1/8 4.609 ±.030 0.139 ±.004 4.887 117.07 ±0.76 3.53 ±0.10 124.13 -248 BS1806-248 4-3/4 1/8 4.734 ±.030 0.139 ±.004 5.012 120.24 ±0.76 3.53 ±0.10 127.30 -249 BS1806-249 4-7/8 1/8 4.859 ±.035 0.139 ±.004 5.137 123.42 ±0.89 3.53 ±0.10 130.48 -250 BS1806-250 5 1/8 4.984 ±.035 0.139 ±.004 5.262 126.59 ±0.89 3.53 ±0.10 133.65 -251 BS1806-251 5-1/8 1/8 5.109 ±.035 0.139 ±.004 5.387 129.77 ±0.89 3.53 ±0.10 136.83 -252 BS1806-252 5-1/4 1/8 5.234 ±.035 0.139 ±.004 5.512 132.94 ±0.89 3.53 ±0.10 140.00 -253 BS1806-253 5-3/8 1/8 5.359 ±.035 0.139 ±.004 5.637 136.12 ±0.89 3.53 ±0.10 143.18 -254 BS1806-254 5-1/2 1/8 5.484 ±.035 0.139 ±.004 5.762 139.29 ±0.89 3.53 ±0.10 146.35 -255 BS1806-255 5-5/8 1/8 5.609 ±.035 0.139 ±.004 5.887 142.47 ±0.89 3.53 ±0.10 149.53 -256 BS1806-256 5-3/4 1/8 5.734 ±.035 0.139 ±.004 6.012 145.65 ±0.89 3.53 ±0.10 152.71 -257 BS1806-257 5-7/8 1/8 5.859 ±.035 0.139 ±.004 6.137 148.82 ±0.89 3.53 ±0.10 155.88 -258 BS1806-258 6 1/8 5.984 ±.035 0.139 ±.004 6.262 151.99 ±0.89 3.53 ±0.10 159.05 -259 BS1806-259 6-1/4 1/8 6.234 ±.040 0.139 ±.004 6.512 158.34 ±1.02 3.53 ±0.10 165.40 -260 BS1806-260 6-1/2 1/8 6.484 ±.040 0.139 ±.004 6.762 164.69 ±1.02 3.53 ±0.10 171.75 -261 BS1806-261 6-3/4 1/8 6.734 ±.040 0.139 ±.004 7.012 171.04 ±1.02 3.53 ±0.10 178.10 -262 BS1806-262 7 1/8 6.984 ±.040 0.139 ±.004 7.262 177.39 ±1.02 3.53 ±0.10 184.45 -263 BS1806-263 7-1/4 1/8 7.234 ±.045 0.139 ±.004 7.512 183.74 ±1.14 3.53 ±0.10 190.80 -264 BS1806-264 7-1/2 1/8 7.484 ±.045 0.139 ±.004 7.762 190.09 ±1.14 3.53 ±0.10 197.15 -265 BS1806-265 7-3/4 1/8 7.734 ±.045 0.139 ±.004 8.012 196.44 ±1.14 3.53 ±0.10 203.50 -266 BS1806-266 8 1/8 7.984 ±.045 0.139 ±.004 8.262 202.79 ±1.14 3.53 ±0.10 209.85 -267 BS1806-267 8-1/4 1/8 8.234 ±.050 0.139 ±.004 8.512 209.14 ±1.27 3.53 ±0.10 216.20 -268 BS1806-268 8-1/2 1/8 8.484 ±.050 0.139 ±.004 8.762 215.49 ±1.27 3.53 ±0.10 222.55 -269 BS1806-269 8-3/4 1/8 8.734 ±.050 0.139 ±.004 9.012 221.84 ±1.27 3.53 ±0.10 228.90 -270 BS1806-270 9 1/8 8.984 ±.050 0.139 ±.004 9.262 228.19 ±1.27 3.53 ±0.10 235.25 -271 BS1806-271 9-1/4 1/8 9.234 ±.055 0.139 ±.004 9.512 234.54 ±1.40 3.53 ±0.10 241.60 -272 BS1806-272 9-1/2 1/8 9.484 ±.055 0.139 ±.004 9.762 240.89 ±1.40 3.53 ±0.10 247.95 -273 BS1806-273 9-3/4 1/8 9.734 ±.055 0.139 ±.004 10.012 247.24 ±1.40 3.53 ±0.10 254.30 -274 BS1806-274 10 1/8 9.984 ±.055 0.139 ±.004 10.262 253.59 ±1.40 3.53 ±0.10 260.65 -275 BS1806-275 10-1/2 1/8 10.484 ±.065 0.139 ±.004 10.762 266.29 ±1.40 3.53 ±0.10 273.35 -276 BS1806-276 11 1/8 10.984 ±.065 0.139 ±.004 11.262 278.99 ±1.65 3.53 ±0.10 286.05 -277 BS1806-277 11-1/2 1/8 11.484 ±.065 0.139 ±.004 11.762 291.69 ±1.65 3.53 ±0.10 298.75 -278 BS1806-278 12 1/8 11.984 ±.065 0.139 ±.004 12.262 304.39 ±1.65 3.53 ±0.10 311.45 -279 BS1806-279 13 1/8 12.984 ±.065 0.139 ±.004 13.262 329.79 ±1.65 3.53 ±0.10 336.85 -280 BS1806-280 14 1/8 13.984 ±.065 0.139 ±.004 14.262 355.19 ±1.65 3.53 ±0.10 362.25 -281 BS1806-281 15 1/8 14.984 ±.065 0.139 ±.004 15.262 380.59 ±1.65 3.53 ±0.10 387.65 -282 BS1806-282 16 1/8 15.955 ±.075 0.139 ±.004 16.233 405.26 ±1.91 3.53 ±0.10 412.32 -283 BS1806-283 17 1/8 16.955 ±.080 0.139 ±.004 17.233 430.66 ±2.03 3.53 ±0.10 437.72 -284 BS1806-284 18 1/8 17.955 ±.085 0.139 ±.004 18.233 456.06 ±2.16 3.53 ±0.10 463.12
3xx series 87 sizes
BS 1806 3xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -309 BS1806-309 7/16 3/16 0.412 ±.005 0.210 ±.005 0.832 10.46 ±0.13 5.33 ±0.13 21.12 -310 BS1806-310 1/2 3/16 0.475 ±.005 0.210 ±.005 0.895 12.07 ±0.13 5.33 ±0.13 22.73 -311 BS1806-311 9/16 3/16 0.537 ±.007 0.210 ±.005 0.957 13.64 ±0.18 5.33 ±0.13 24.30 -312 BS1806-312 5/8 3/16 0.600 ±.009 0.210 ±.005 1.020 15.24 ±0.23 5.33 ±0.13 25.90 -313 BS1806-313 11/16 3/16 0.662 ±.009 0.210 ±.005 1.082 16.81 ±0.23 5.33 ±0.13 27.47 -314 BS1806-314 3/4 3/16 0.725 ±.010 0.210 ±.005 1.145 18.42 ±0.25 5.33 ±0.13 29.08 -315 BS1806-315 13/16 3/16 0.787 ±.010 0.210 ±.005 1.207 19.99 ±0.25 5.33 ±0.13 30.65 -316 BS1806-316 7/8 3/16 0.850 ±.010 0.210 ±.005 1.270 21.59 ±0.25 5.33 ±0.13 32.25 -317 BS1806-317 15/16 3/16 0.912 ±.010 0.210 ±.005 1.332 23.16 ±0.25 5.33 ±0.13 33.82 -318 BS1806-318 1 3/16 0.975 ±.010 0.210 ±.005 1.395 24.77 ±0.25 5.33 ±0.13 35.43 -319 BS1806-319 1-1/16 3/16 1.037 ±.010 0.210 ±.005 1.457 26.34 ±0.25 5.33 ±0.13 37.00 -320 BS1806-320 1-1/8 3/16 1.100 ±.012 0.210 ±.005 1.520 27.94 ±0.30 5.33 ±0.13 38.60 -321 BS1806-321 1-3/16 3/16 1.162 ±.012 0.210 ±.005 1.582 29.51 ±0.30 5.33 ±0.13 40.17 -322 BS1806-322 1-1/4 3/16 1.225 ±.012 0.210 ±.005 1.645 31.12 ±0.30 5.33 ±0.13 41.78 -323 BS1806-323 1-5/16 3/16 1.287 ±.012 0.210 ±.005 1.707 32.69 ±0.30 5.33 ±0.13 43.35 -324 BS1806-324 1-3/8 3/16 1.350 ±.012 0.210 ±.005 1.770 34.29 ±0.30 5.33 ±0.13 44.95 -325 BS1806-325 1-1/2 3/16 1.475 ±.015 0.210 ±.005 1.895 37.47 ±0.38 5.33 ±0.13 48.13 -326 BS1806-326 1-5/8 3/16 1.600 ±.015 0.210 ±.005 2.020 40.64 ±0.38 5.33 ±0.13 51.30 -327 BS1806-327 1-3/4 3/16 1.725 ±.015 0.210 ±.005 2.145 43.82 ±0.38 5.33 ±0.13 54.48 -328 BS1806-328 1-7/8 3/16 1.850 ±.015 0.210 ±.005 2.270 46.99 ±0.38 5.33 ±0.13 57.65 -329 BS1806-329 2 3/16 1.975 ±.018 0.210 ±.005 2.395 50.17 ±0.46 5.33 ±0.13 60.83 -330 BS1806-330 2-1/8 3/16 2.100 ±.018 0.210 ±.005 2.520 53.34 ±0.46 5.33 ±0.13 64.00 -331 BS1806-331 2-1/4 3/16 2.225 ±.018 0.210 ±.005 2.645 56.52 ±0.46 5.33 ±0.13 67.18 -332 BS1806-332 2-3/8 3/16 2.350 ±.018 0.210 ±.005 2.770 59.69 ±0.46 5.33 ±0.13 70.35 -333 BS1806-333 2-1/2 3/16 2.475 ±.020 0.210 ±.005 2.895 62.87 ±0.51 5.33 ±0.13 73.53 -334 BS1806-334 2-5/8 3/16 2.600 ±.020 0.210 ±.005 3.020 66.04 ±0.51 5.33 ±0.13 76.70 -335 BS1806-335 2-3/4 3/16 2.725 ±.020 0.210 ±.005 3.145 69.22 ±0.51 5.33 ±0.13 79.88 -336 BS1806-336 2-7/8 3/16 2.850 ±.020 0.210 ±.005 3.270 72.39 ±0.51 5.33 ±0.13 83.05 -337 BS1806-337 3 3/16 2.975 ±.024 0.210 ±.005 3.395 75.57 ±0.61 5.33 ±0.13 86.23 -338 BS1806-338 3-1/8 3/16 3.100 ±.024 0.210 ±.005 3.520 78.74 ±0.61 5.33 ±0.13 89.40 -339 BS1806-339 3-1/4 3/16 3.225 ±.024 0.210 ±.005 3.645 81.92 ±0.61 5.33 ±0.13 92.58 -340 BS1806-340 3-3/8 3/16 3.350 ±.024 0.210 ±.005 3.770 85.09 ±0.61 5.33 ±0.13 95.75 -341 BS1806-341 3-1/2 3/16 3.475 ±.024 0.210 ±.005 3.895 88.27 ±0.61 5.33 ±0.13 98.93 -342 BS1806-342 3-5/8 3/16 3.600 ±.028 0.210 ±.005 4.020 91.44 ±0.71 5.33 ±0.13 102.10 -343 BS1806-343 3-3/4 3/16 3.725 ±.028 0.210 ±.005 4.145 94.62 ±0.71 5.33 ±0.13 105.28 -344 BS1806-344 3-7/8 3/16 3.850 ±.028 0.210 ±.005 4.270 97.79 ±0.71 5.33 ±0.13 108.45 -345 BS1806-345 4 3/16 3.975 ±.028 0.210 ±.005 4.395 100.97 ±0.71 5.33 ±0.13 111.63 -346 BS1806-346 4-1/8 3/16 4.100 ±.028 0.210 ±.005 4.520 104.14 ±0.71 5.33 ±0.13 114.80 -347 BS1806-347 4-1/4 3/16 4.225 ±.030 0.210 ±.005 4.645 107.32 ±0.76 5.33 ±0.13 117.98 -348 BS1806-348 4-3/8 3/16 4.350 ±.030 0.210 ±.005 4.770 110.49 ±0.76 5.33 ±0.13 121.15 -349 BS1806-349 4-1/2 3/16 4.475 ±.030 0.210 ±.005 4.895 113.67 ±0.76 5.33 ±0.13 124.33 -350 BS1806-350 4-5/8 3/16 4.600 ±.030 0.210 ±.005 5.020 116.84 ±0.76 5.33 ±0.13 127.50 -351 BS1806-351 4-3/4 3/16 4.725 ±.030 0.210 ±.005 5.145 120.02 ±0.76 5.33 ±0.13 130.68 -352 BS1806-352 4-7/8 3/16 4.850 ±.030 0.210 ±.005 5.270 123.19 ±0.76 5.33 ±0.13 133.85 -353 BS1806-353 5 3/16 4.975 ±.037 0.210 ±.005 5.395 126.37 ±0.94 5.33 ±0.13 137.03 -354 BS1806-354 5-1/8 3/16 5.100 ±.037 0.210 ±.005 5.520 129.54 ±0.94 5.33 ±0.13 140.20 -355 BS1806-355 5-1/4 3/16 5.225 ±.037 0.210 ±.005 5.645 132.72 ±0.94 5.33 ±0.13 143.38 -356 BS1806-356 5-3/8 3/16 5.350 ±.037 0.210 ±.005 5.770 135.89 ±0.94 5.33 ±0.13 146.55 -357 BS1806-357 5-1/2 3/16 5.475 ±.037 0.210 ±.005 5.895 139.07 ±0.94 5.33 ±0.13 149.73 -358 BS1806-358 5-5/8 3/16 5.600 ±.037 0.210 ±.005 6.020 142.24 ±0.94 5.33 ±0.13 152.90 -359 BS1806-359 5-3/4 3/16 5.725 ±.037 0.210 ±.005 6.145 145.42 ±0.94 5.33 ±0.13 156.08 -360 BS1806-360 5-7/8 3/16 5.850 ±.037 0.210 ±.005 6.270 148.59 ±0.94 5.33 ±0.13 159.25 -361 BS1806-361 6 3/16 5.975 ±.037 0.210 ±.005 6.395 151.77 ±0.94 5.33 ±0.13 162.43 -362 BS1806-362 6-1/4 3/16 6.225 ±.040 0.210 ±.005 6.645 158.12 ±1.02 5.33 ±0.13 168.78 -363 BS1806-363 6-1/2 3/16 6.475 ±.040 0.210 ±.005 6.895 164.47 ±1.02 5.33 ±0.13 175.13 -364 BS1806-364 6-3/4 3/16 6.725 ±.040 0.210 ±.005 7.145 170.82 ±1.02 5.33 ±0.13 181.48 -365 BS1806-365 7 3/16 6.975 ±.040 0.210 ±.005 7.395 177.17 ±1.02 5.33 ±0.13 187.83 -366 BS1806-366 7-1/4 3/16 7.225 ±.045 0.210 ±.005 7.645 183.52 ±1.14 5.33 ±0.13 194.18 -367 BS1806-367 7-1/2 3/16 7.475 ±.045 0.210 ±.005 7.895 189.87 ±1.14 5.33 ±0.13 200.53 -368 BS1806-368 7-3/4 3/16 7.725 ±.045 0.210 ±.005 8.145 196.22 ±1.14 5.33 ±0.13 206.88 -369 BS1806-369 8 3/16 7.975 ±.045 0.210 ±.005 8.395 202.57 ±1.14 5.33 ±0.13 213.23 -370 BS1806-370 8-1/4 3/16 8.225 ±.050 0.210 ±.005 8.645 208.92 ±1.27 5.33 ±0.13 219.58 -371 BS1806-371 8-1/2 3/16 8.475 ±.050 0.210 ±.005 8.895 215.27 ±1.27 5.33 ±0.13 225.93 -372 BS1806-372 8-3/4 3/16 8.725 ±.050 0.210 ±.005 9.145 221.62 ±1.27 5.33 ±0.13 232.28 -373 BS1806-373 9 3/16 8.975 ±.050 0.210 ±.005 9.395 227.97 ±1.27 5.33 ±0.13 238.63 -374 BS1806-374 9-1/4 3/16 9.225 ±.055 0.210 ±.005 9.645 234.32 ±1.40 5.33 ±0.13 244.98 -375 BS1806-375 9-1/2 3/16 9.475 ±.055 0.210 ±.005 9.895 240.67 ±1.40 5.33 ±0.13 251.33 -376 BS1806-376 9-3/4 3/16 9.725 ±.055 0.210 ±.005 10.145 247.02 ±1.40 5.33 ±0.13 257.68 -377 BS1806-377 10 3/16 9.975 ±.055 0.210 ±.005 10.395 253.37 ±1.40 5.33 ±0.13 264.03 -378 BS1806-378 10-1/2 3/16 10.475 ±.060 0.210 ±.005 10.895 266.07 ±1.52 5.33 ±0.13 276.73 -379 BS1806-379 11 3/16 10.975 ±.060 0.210 ±.005 11.395 278.77 ±1.52 5.33 ±0.13 289.43 -380 BS1806-380 11-1/2 3/16 11.475 ±.065 0.210 ±.005 11.895 291.47 ±1.65 5.33 ±0.13 302.13 -381 BS1806-381 12 3/16 11.975 ±.065 0.210 ±.005 12.395 304.17 ±1.65 5.33 ±0.13 314.83 -382 BS1806-382 13 3/16 12.975 ±.065 0.210 ±.005 13.395 329.57 ±1.65 5.33 ±0.13 340.23 -383 BS1806-383 14 3/16 13.975 ±.070 0.210 ±.005 14.395 354.97 ±1.78 5.33 ±0.13 365.63 -384 BS1806-384 15 3/16 14.975 ±.070 0.210 ±.005 15.395 380.37 ±1.78 5.33 ±0.13 391.03 -385 BS1806-385 16 3/16 15.955 ±.075 0.210 ±.005 16.375 405.26 ±1.91 5.33 ±0.13 415.92 -386 BS1806-386 17 3/16 16.955 ±.080 0.210 ±.005 17.375 430.66 ±2.03 5.33 ±0.13 441.32 -387 BS1806-387 18 3/16 17.955 ±.085 0.210 ±.005 18.375 456.06 ±2.16 5.33 ±0.13 466.72 -388 BS1806-388 19 3/16 18.955 ±.090 0.210 ±.005 19.375 481.41 ±2.29 5.33 ±0.13 492.07 -389 BS1806-389 20 3/16 19.955 ±.095 0.210 ±.005 20.375 506.81 ±2.41 5.33 ±0.13 517.47 -390 BS1806-390 21 3/16 20.955 ±.095 0.210 ±.005 21.375 532.21 ±2.41 5.33 ±0.13 542.87 -391 BS1806-391 22 3/16 21.955 ±.100 0.210 ±.005 22.375 557.61 ±2.54 5.33 ±0.13 568.27 -392 BS1806-392 23 3/16 22.940 ±.105 0.210 ±.005 23.360 582.68 ±2.67 5.33 ±0.13 593.34 -393 BS1806-393 24 3/16 23.940 ±.110 0.210 ±.005 24.360 608.08 ±2.79 5.33 ±0.13 618.74 -394 BS1806-394 25 3/16 24.940 ±.115 0.210 ±.005 25.360 633.48 ±2.92 5.33 ±0.13 644.14 -395 BS1806-395 26 3/16 25.940 ±.120 0.210 ±.005 26.360 658.88 ±3.05 5.33 ±0.13 669.54
4xx series 76 sizes
BS 1806 4xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -400 BS1806-400 — — 1.350 ±.014 0.275 ±.006 1.900 34.29 ±0.35 6.99 ±0.15 48.27 -401 BS1806-401 — — 1.475 ±.014 0.275 ±.006 2.025 37.47 ±0.35 6.99 ±0.15 51.45 -402 BS1806-402 — — 1.600 ±.014 0.275 ±.006 2.150 40.64 ±0.35 6.99 ±0.15 54.62 -403 BS1806-403 — — 1.725 ±.014 0.275 ±.006 2.275 43.82 ±0.35 6.99 ±0.15 57.80 -404 BS1806-404 — — 1.850 ±.014 0.275 ±.006 2.400 46.99 ±0.35 6.99 ±0.15 60.97 -405 BS1806-405 — — 1.975 ±.016 0.275 ±.006 2.525 50.17 ±0.40 6.99 ±0.15 64.15 -406 BS1806-406 — — 2.100 ±.016 0.275 ±.006 2.650 53.34 ±0.40 6.99 ±0.15 67.32 -407 BS1806-407 — — 2.225 ±.016 0.275 ±.006 2.775 56.52 ±0.40 6.99 ±0.15 70.50 -408 BS1806-408 — — 2.350 ±.016 0.275 ±.006 2.900 59.69 ±0.40 6.99 ±0.15 73.67 -409 BS1806-409 — — 2.475 ±.016 0.275 ±.006 3.025 62.87 ±0.40 6.99 ±0.15 76.85 -410 BS1806-410 — — 2.600 ±.016 0.275 ±.006 3.150 66.04 ±0.40 6.99 ±0.15 80.02 -411 BS1806-411 — — 2.725 ±.016 0.275 ±.006 3.275 69.22 ±0.40 6.99 ±0.15 83.20 -412 BS1806-412 — — 2.850 ±.016 0.275 ±.006 3.400 72.39 ±0.40 6.99 ±0.15 86.37 -413 BS1806-413 — — 2.975 ±.016 0.275 ±.006 3.525 75.57 ±0.40 6.99 ±0.15 89.55 -414 BS1806-414 — — 3.100 ±.016 0.275 ±.006 3.650 78.74 ±0.40 6.99 ±0.15 92.72 -415 BS1806-415 — — 3.225 ±.020 0.275 ±.006 3.775 81.92 ±0.50 6.99 ±0.15 95.90 -416 BS1806-416 — — 3.350 ±.020 0.275 ±.006 3.900 85.09 ±0.50 6.99 ±0.15 99.07 -417 BS1806-417 — — 3.475 ±.020 0.275 ±.006 4.025 88.27 ±0.50 6.99 ±0.15 102.25 -418 BS1806-418 — — 3.600 ±.020 0.275 ±.006 4.150 91.44 ±0.50 6.99 ±0.15 105.42 -419 BS1806-419 — — 3.725 ±.020 0.275 ±.006 4.275 94.62 ±0.50 6.99 ±0.15 108.60 -420 BS1806-420 — — 3.850 ±.020 0.275 ±.006 4.400 97.79 ±0.50 6.99 ±0.15 111.77 -421 BS1806-421 — — 3.975 ±.020 0.275 ±.006 4.525 100.97 ±0.50 6.99 ±0.15 114.95 -422 BS1806-422 — — 4.100 ±.020 0.275 ±.006 4.650 104.14 ±0.50 6.99 ±0.15 118.12 -423 BS1806-423 — — 4.225 ±.020 0.275 ±.006 4.775 107.32 ±0.50 6.99 ±0.15 121.30 -424 BS1806-424 — — 4.350 ±.020 0.275 ±.006 4.900 110.49 ±0.50 6.99 ±0.15 124.47 -425 BS1806-425 4-1/2 1/4 4.475 ±.033 0.275 ±.006 5.025 113.67 ±0.84 6.99 ±0.15 127.65 -426 BS1806-426 4-5/8 1/4 4.600 ±.033 0.275 ±.006 5.150 116.84 ±0.84 6.99 ±0.15 130.82 -427 BS1806-427 4-3/4 1/4 4.725 ±.033 0.275 ±.006 5.275 120.02 ±0.84 6.99 ±0.15 134.00 -428 BS1806-428 4-7/8 1/4 4.850 ±.033 0.275 ±.006 5.400 123.19 ±0.84 6.99 ±0.15 137.17 -429 BS1806-429 5 1/4 4.975 ±.037 0.275 ±.006 5.525 126.37 ±0.94 6.99 ±0.15 140.35 -430 BS1806-430 5-1/8 1/4 5.100 ±.037 0.275 ±.006 5.650 129.54 ±0.94 6.99 ±0.15 143.52 -431 BS1806-431 5-1/4 1/4 5.225 ±.037 0.275 ±.006 5.775 132.72 ±0.94 6.99 ±0.15 146.70 -432 BS1806-432 5-3/8 1/4 5.350 ±.037 0.275 ±.006 5.900 135.89 ±0.94 6.99 ±0.15 149.87 -433 BS1806-433 5-1/2 1/4 5.475 ±.037 0.275 ±.006 6.025 139.07 ±0.94 6.99 ±0.15 153.05 -434 BS1806-434 5-5/8 1/4 5.600 ±.037 0.275 ±.006 6.150 142.24 ±0.94 6.99 ±0.15 156.22 -435 BS1806-435 5-3/4 1/4 5.725 ±.037 0.275 ±.006 6.275 145.42 ±0.94 6.99 ±0.15 159.40 -436 BS1806-436 5-7/8 1/4 5.850 ±.037 0.275 ±.006 6.400 148.59 ±0.94 6.99 ±0.15 162.57 -437 BS1806-437 6 1/4 5.975 ±.037 0.275 ±.006 6.525 151.77 ±0.94 6.99 ±0.15 165.75 -438 BS1806-438 6-1/4 1/4 6.225 ±.040 0.275 ±.006 6.775 158.12 ±1.02 6.99 ±0.15 172.10 -439 BS1806-439 6-1/2 1/4 6.475 ±.040 0.275 ±.006 7.025 164.47 ±1.02 6.99 ±0.15 178.45 -440 BS1806-440 6-3/4 1/4 6.725 ±.040 0.275 ±.006 7.275 170.82 ±1.02 6.99 ±0.15 184.80 -441 BS1806-441 7 1/4 6.975 ±.040 0.275 ±.006 7.525 177.17 ±1.02 6.99 ±0.15 191.15 -442 BS1806-442 7-1/4 1/4 7.225 ±.045 0.275 ±.006 7.775 183.52 ±1.14 6.99 ±0.15 197.50 -443 BS1806-443 7-1/2 1/4 7.475 ±.045 0.275 ±.006 8.025 189.87 ±1.14 6.99 ±0.15 203.85 -444 BS1806-444 7-3/4 1/4 7.725 ±.045 0.275 ±.006 8.275 196.22 ±1.14 6.99 ±0.15 210.20 -445 BS1806-445 8 1/4 7.975 ±.045 0.275 ±.006 8.525 202.57 ±1.14 6.99 ±0.15 216.55 -446 BS1806-446 8-1/2 1/4 8.475 ±.055 0.275 ±.006 9.025 215.27 ±1.40 6.99 ±0.15 229.25 -447 BS1806-447 9 1/4 8.975 ±.055 0.275 ±.006 9.525 227.97 ±1.40 6.99 ±0.15 241.95 -448 BS1806-448 9-1/2 1/4 9.475 ±.055 0.275 ±.006 10.025 240.67 ±1.40 6.99 ±0.15 254.65 -449 BS1806-449 10 1/4 9.975 ±.055 0.275 ±.006 10.525 253.37 ±1.40 6.99 ±0.15 267.35 -450 BS1806-450 10-1/2 1/4 10.475 ±.060 0.275 ±.006 11.025 266.07 ±1.52 6.99 ±0.15 280.05 -451 BS1806-451 11 1/4 10.975 ±.060 0.275 ±.006 11.525 278.77 ±1.52 6.99 ±0.15 292.75 -452 BS1806-452 11-1/2 1/4 11.475 ±.060 0.275 ±.006 12.025 291.47 ±1.52 6.99 ±0.15 305.45 -453 BS1806-453 12 1/4 11.975 ±.060 0.275 ±.006 12.525 304.17 ±1.52 6.99 ±0.15 318.15 -454 BS1806-454 12-1/2 1/4 12.475 ±.060 0.275 ±.006 13.025 316.87 ±1.52 6.99 ±0.15 330.85 -455 BS1806-455 13 1/4 12.975 ±.060 0.275 ±.006 13.525 329.57 ±1.52 6.99 ±0.15 343.55 -456 BS1806-456 13-1/2 1/4 13.457 ±.070 0.275 ±.006 14.007 342.27 ±1.78 6.99 ±0.15 356.25 -457 BS1806-457 14 1/4 13.975 ±.070 0.275 ±.006 14.525 354.97 ±1.78 6.99 ±0.15 368.95 -458 BS1806-458 14-1/2 1/4 14.475 ±.070 0.275 ±.006 15.025 367.67 ±1.78 6.99 ±0.15 381.65 -459 BS1806-459 15 1/4 14.975 ±.070 0.275 ±.006 15.525 380.37 ±1.78 6.99 ±0.15 394.35 -460 BS1806-460 15-1/2 1/4 15.475 ±.070 0.275 ±.006 16.025 393.07 ±1.78 6.99 ±0.15 407.05 -461 BS1806-461 16 1/4 15.955 ±.075 0.275 ±.006 16.505 405.26 ±1.91 6.99 ±0.15 419.24 -462 BS1806-462 16-1/2 1/4 16.455 ±.075 0.275 ±.006 17.005 417.96 ±1.91 6.99 ±0.15 431.94 -463 BS1806-463 17 1/4 16.955 ±.080 0.275 ±.006 17.505 430.66 ±2.03 6.99 ±0.15 444.64 -464 BS1806-464 17-1/2 1/4 17.455 ±.085 0.275 ±.006 18.005 443.36 ±2.16 6.99 ±0.15 457.34 -465 BS1806-465 18 1/4 17.955 ±.085 0.275 ±.006 18.505 456.06 ±2.16 6.99 ±0.15 470.04 -466 BS1806-466 18-1/2 1/4 18.455 ±.085 0.275 ±.006 19.005 468.76 ±2.16 6.99 ±0.15 482.74 -467 BS1806-467 19 1/4 18.955 ±.090 0.275 ±.006 19.505 481.46 ±2.29 6.99 ±0.15 495.44 -468 BS1806-468 19-1/2 1/4 19.455 ±.090 0.275 ±.006 20.005 494.16 ±2.29 6.99 ±0.15 508.14 -469 BS1806-469 20 1/4 19.955 ±.095 0.275 ±.006 20.505 506.86 ±2.41 6.99 ±0.15 520.84 -470 BS1806-470 21 1/4 20.955 ±.095 0.275 ±.006 21.505 532.26 ±2.41 6.99 ±0.15 546.24 -471 BS1806-471 22 1/4 21.955 ±.100 0.275 ±.006 22.505 557.66 ±2.54 6.99 ±0.15 571.64 -472 BS1806-472 23 1/4 22.940 ±.105 0.275 ±.006 23.490 582.68 ±2.67 6.99 ±0.15 596.66 -473 BS1806-473 24 1/4 23.940 ±.110 0.275 ±.006 24.490 608.08 ±2.79 6.99 ±0.15 622.06 -474 BS1806-474 25 1/4 24.940 ±.115 0.275 ±.006 25.490 633.48 ±2.92 6.99 ±0.15 647.46 -475 BS1806-475 26 1/4 25.940 ±.120 0.275 ±.006 26.490 658.88 ±3.05 6.99 ±0.15 672.86
9xx series 2 sizes
BS 1806 9xx series size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -902 BS1806-902 — — 0.239 ±.006 0.064 ±.003 0.367 6.07 ±0.15 1.63 ±0.08 9.33 -903 BS1806-903 — — 0.301 ±.006 0.064 ±.003 0.429 7.65 ±0.15 1.63 ±0.08 10.91
Additional BS 1806 sizes 108 sizes
BS 1806 Additional BS 1806 sizes size table Dash Code Nom ID Nom CS ID (in) CS (in) OD (in) ID (mm) CS (mm) OD (mm) -517 BS1806-517 — — 1.428 ±.014 0.070 ±.003 1.568 36.27 ±0.35 1.78 ±0.08 39.83 -519 BS1806-519 — — 1.553 ±.014 0.070 ±.003 1.693 39.45 ±0.35 1.78 ±0.08 43.01 -532 BS1806-532 — — 3.110 ±.016 0.070 ±.003 3.250 78.99 ±0.40 1.78 ±0.08 82.55 -534 BS1806-534 — — 3.360 ±.020 0.070 ±.003 3.500 85.34 ±0.50 1.78 ±0.08 88.90 -536 BS1806-536 — — 3.610 ±.020 0.070 ±.003 3.750 91.69 ±0.50 1.78 ±0.08 95.25 -538 BS1806-538 — — 3.860 ±.020 0.070 ±.003 4.000 98.04 ±0.50 1.78 ±0.08 101.60 -540 BS1806-540 — — 4.110 ±.020 0.070 ±.003 4.250 104.39 ±0.50 1.78 ±0.08 107.95 -542 BS1806-542 — — 4.360 ±.020 0.070 ±.003 4.500 110.74 ±0.50 1.78 ±0.08 114.30 -544 BS1806-544 — — 4.610 ±.020 0.070 ±.003 4.750 117.09 ±0.50 1.78 ±0.08 120.65 -546 BS1806-546 — — 4.860 ±.028 0.070 ±.003 5.000 123.44 ±0.70 1.78 ±0.08 127.00 -548 BS1806-548 — — 5.095 ±.028 0.070 ±.003 5.235 129.41 ±0.70 1.78 ±0.08 132.97 -550 BS1806-550 — — 5.345 ±.028 0.070 ±.003 5.485 135.76 ±0.70 1.78 ±0.08 139.32 -551 BS1806-551 — — 5.470 ±.028 0.070 ±.003 5.610 138.94 ±0.70 1.78 ±0.08 142.50 -552 BS1806-552 — — 5.595 ±.028 0.070 ±.003 5.735 142.11 ±0.70 1.78 ±0.08 145.67 -553 BS1806-553 — — 5.720 ±.028 0.070 ±.003 5.860 145.29 ±0.70 1.78 ±0.08 148.85 -554 BS1806-554 — — 5.845 ±.028 0.070 ±.003 5.985 148.46 ±0.70 1.78 ±0.08 152.02 -555 BS1806-555 — — 5.970 ±.028 0.070 ±.003 6.110 151.64 ±0.70 1.78 ±0.08 155.20 -556 BS1806-556 — — 6.095 ±.028 0.070 ±.003 6.235 154.81 ±0.70 1.78 ±0.08 158.37 -557 BS1806-557 — — 6.220 ±.028 0.070 ±.003 6.360 157.99 ±0.70 1.78 ±0.08 161.55 -558 BS1806-558 — — 6.345 ±.028 0.070 ±.003 6.485 161.16 ±0.70 1.78 ±0.08 164.72 -559 BS1806-559 — — 6.470 ±.028 0.070 ±.003 6.610 164.34 ±0.70 1.78 ±0.08 167.90 -560 BS1806-560 — — 6.695 ±.028 0.070 ±.003 6.835 170.05 ±0.70 1.78 ±0.08 173.61 -561 BS1806-561 — — 6.720 ±.028 0.070 ±.003 6.860 170.69 ±0.70 1.78 ±0.08 174.25 -562 BS1806-562 — — 6.845 ±.028 0.070 ±.003 6.985 173.86 ±0.70 1.78 ±0.08 177.42 -606 BS1806-606 — — 0.070 ±.006 0.040 ±.003 0.150 1.78 ±0.15 1.02 ±0.08 3.82 -607 BS1806-607 — — 0.100 ±.006 0.040 ±.003 0.180 2.54 ±0.15 1.02 ±0.08 4.58 -610 BS1806-610 — — 0.266 ±.006 0.070 ±.003 0.406 6.76 ±0.15 1.78 ±0.08 10.32 -611 BS1806-611 — — 0.344 ±.006 0.070 ±.003 0.484 8.74 ±0.15 1.78 ±0.08 12.30 -613 BS1806-613 — — 0.391 ±.006 0.103 ±.004 0.597 9.93 ±0.15 2.62 ±0.09 15.17 -614 BS1806-614 — — 0.469 ±.008 0.103 ±.004 0.675 11.91 ±0.20 2.62 ±0.09 17.15 -615 BS1806-615 — — 0.516 ±.008 0.103 ±.004 0.722 13.11 ±0.20 2.62 ±0.09 18.35 -616 BS1806-616 — — 0.594 ±.008 0.103 ±.004 0.800 15.09 ±0.20 2.62 ±0.09 20.33 -617 BS1806-617 — — 0.703 ±.008 0.103 ±.004 0.909 17.86 ±0.20 2.62 ±0.09 23.10 -618 BS1806-618 — — 1.016 ±.010 0.139 ±.004 1.294 25.81 ±0.25 3.53 ±0.10 32.87 -619 BS1806-619 — — 2.937 ±.016 0.210 ±.005 3.357 74.61 ±0.40 5.33 ±0.13 85.27 -620 BS1806-620 — — 3.141 ±.016 0.210 ±.005 3.561 79.78 ±0.40 5.33 ±0.13 90.44 -621 BS1806-621 — — 3.531 ±.020 0.210 ±.005 3.951 89.69 ±0.50 5.33 ±0.13 100.35 -622 BS1806-622 — — 3.937 ±.020 0.210 ±.005 4.357 100.00 ±0.50 5.33 ±0.13 110.66 -623 BS1806-623 — — 4.313 ±.020 0.210 ±.005 4.733 109.54 ±0.50 5.33 ±0.13 120.20 -624 BS1806-624 — — 4.516 ±.020 0.275 ±.006 5.066 114.71 ±0.50 6.99 ±0.15 128.69 -625 BS1806-625 — — 4.906 ±.028 0.275 ±.006 5.456 124.61 ±0.70 6.99 ±0.15 138.59 -626 BS1806-626 — — 5.297 ±.028 0.275 ±.006 5.847 134.54 ±0.70 6.99 ±0.15 148.52 -627 BS1806-627 — — 6.281 ±.028 0.275 ±.006 6.831 159.54 ±0.70 6.99 ±0.15 173.52 -628 BS1806-628 — — 6.563 ±.028 0.275 ±.006 7.113 166.70 ±0.70 6.99 ±0.15 180.68 -640 BS1806-640 — — 2.924 ±.016 0.103 ±.004 3.130 74.27 ±0.40 2.62 ±0.09 79.51 -641 BS1806-641 — — 3.049 ±.016 0.103 ±.004 3.255 77.44 ±0.40 2.62 ±0.09 82.68 -642 BS1806-642 — — 3.174 ±.020 0.103 ±.004 3.380 80.62 ±0.50 2.62 ±0.09 85.86 -643 BS1806-643 — — 3.299 ±.020 0.103 ±.004 3.505 83.79 ±0.50 2.62 ±0.09 89.03 -644 BS1806-644 — — 6.100 ±.028 0.210 ±.005 6.520 154.94 ±0.70 5.33 ±0.13 165.60 -645 BS1806-645 — — 6.350 ±.028 0.210 ±.005 6.770 161.29 ±0.70 5.33 ±0.13 171.95 -646 BS1806-646 — — 6.600 ±.028 0.210 ±.005 7.020 167.64 ±0.70 5.33 ±0.13 178.30 -647 BS1806-647 — — 6.850 ±.028 0.210 ±.005 7.270 173.99 ±0.70 5.33 ±0.13 184.65 -648 BS1806-648 — — 12.225 ±.047 0.275 ±.006 12.775 310.52 ±1.20 6.99 ±0.15 324.50 -649 BS1806-649 — — 12.725 ±.047 0.275 ±.006 13.275 323.22 ±1.20 6.99 ±0.15 337.20 -650 BS1806-650 — — 13.225 ±.047 0.275 ±.006 13.775 335.92 ±1.20 6.99 ±0.15 349.90 -801 BS1806-801 — — 0.125 ±.006 0.070 ±.003 0.265 3.18 ±0.15 1.78 ±0.08 6.74 -802 BS1806-802 — — 0.187 ±.006 0.070 ±.003 0.327 4.75 ±0.15 1.78 ±0.08 8.31 -803 BS1806-803 — — 0.250 ±.006 0.070 ±.003 0.390 6.35 ±0.15 1.78 ±0.08 9.91 -804 BS1806-804 — — 0.313 ±.006 0.070 ±.003 0.453 7.94 ±0.15 1.78 ±0.08 11.50 -806 BS1806-806 — — 0.437 ±.008 0.070 ±.003 0.577 11.10 ±0.20 1.78 ±0.08 14.66 -807 BS1806-807 — — 0.500 ±.008 0.103 ±.004 0.706 12.70 ±0.20 2.62 ±0.09 17.94 -809 BS1806-809 — — 0.625 ±.008 0.103 ±.004 0.831 15.88 ±0.20 2.62 ±0.09 21.12 -810 BS1806-810 — — 0.687 ±.008 0.103 ±.004 0.893 17.45 ±0.20 2.62 ±0.09 22.69 -812 BS1806-812 — — 0.812 ±.010 0.103 ±.004 1.018 20.62 ±0.25 2.62 ±0.09 25.86 -813 BS1806-813 — — 0.875 ±.010 0.103 ±.004 1.081 22.23 ±0.25 2.62 ±0.09 27.47 -814 BS1806-814 — — 0.937 ±.010 0.103 ±.004 1.143 23.80 ±0.25 2.62 ±0.09 29.04 -824 BS1806-824 — — 1.563 ±.014 0.139 ±.004 1.841 39.70 ±0.35 3.53 ±0.10 46.76 -825 BS1806-825 — — 1.625 ±.014 0.139 ±.004 1.903 41.28 ±0.35 3.53 ±0.10 48.34 -826 BS1806-826 — — 1.687 ±.014 0.139 ±.004 1.965 42.85 ±0.35 3.53 ±0.10 49.91 -827 BS1806-827 — — 1.750 ±.014 0.139 ±.004 2.028 44.45 ±0.35 3.53 ±0.10 51.51 -828 BS1806-828 — — 1.813 ±.014 0.139 ±.004 2.091 46.04 ±0.35 3.53 ±0.10 53.10 -829 BS1806-829 — — 1.875 ±.014 0.139 ±.004 2.153 47.63 ±0.35 3.53 ±0.10 54.69 -830 BS1806-830 — — 1.937 ±.014 0.139 ±.004 2.215 49.20 ±0.35 3.53 ±0.10 56.26 -831 BS1806-831 — — 2.000 ±.016 0.139 ±.004 2.278 50.80 ±0.40 3.53 ±0.10 57.86 -832 BS1806-832 — — 2.063 ±.016 0.139 ±.004 2.341 52.39 ±0.40 3.53 ±0.10 59.45 -833 BS1806-833 — — 2.125 ±.016 0.139 ±.004 2.403 53.98 ±0.40 3.53 ±0.10 61.04 -834 BS1806-834 — — 2.187 ±.016 0.139 ±.004 2.465 55.55 ±0.40 3.53 ±0.10 62.61 -835 BS1806-835 — — 2.250 ±.016 0.139 ±.004 2.528 57.15 ±0.40 3.53 ±0.10 64.21 -836 BS1806-836 — — 2.313 ±.016 0.139 ±.004 2.591 58.74 ±0.40 3.53 ±0.10 65.80 -837 BS1806-837 — — 2.375 ±.016 0.139 ±.004 2.653 60.33 ±0.40 3.53 ±0.10 67.39 -838 BS1806-838 — — 2.437 ±.016 0.139 ±.004 2.715 61.90 ±0.40 3.53 ±0.10 68.96 -839 BS1806-839 — — 2.500 ±.016 0.139 ±.004 2.778 63.50 ±0.40 3.53 ±0.10 70.56 -840 BS1806-840 — — 2.563 ±.016 0.139 ±.004 2.841 65.10 ±0.40 3.53 ±0.10 72.16 -841 BS1806-841 — — 2.625 ±.016 0.139 ±.004 2.903 66.68 ±0.40 3.53 ±0.10 73.74 -842 BS1806-842 — — 2.687 ±.016 0.139 ±.004 2.965 68.25 ±0.40 3.53 ±0.10 75.31 -843 BS1806-843 — — 2.750 ±.016 0.139 ±.004 3.028 69.85 ±0.40 3.53 ±0.10 76.91 -844 BS1806-844 — — 2.813 ±.016 0.139 ±.004 3.091 71.44 ±0.40 3.53 ±0.10 78.50 -845 BS1806-845 — — 2.875 ±.016 0.139 ±.004 3.153 73.03 ±0.40 3.53 ±0.10 80.09 -846 BS1806-846 — — 2.937 ±.016 0.139 ±.004 3.215 74.60 ±0.40 3.53 ±0.10 81.66 -860 BS1806-860 — — 4.625 ±.020 0.210 ±.005 5.045 117.48 ±0.50 5.33 ±0.13 128.14 -861 BS1806-861 — — 4.750 ±.028 0.210 ±.005 5.170 120.65 ±0.70 5.33 ±0.13 131.31 -862 BS1806-862 — — 4.875 ±.028 0.210 ±.005 5.295 123.83 ±0.70 5.33 ±0.13 134.49 -863 BS1806-863 — — 5.000 ±.028 0.210 ±.005 5.420 127.00 ±0.70 5.33 ±0.13 137.66 -864 BS1806-864 — — 5.125 ±.028 0.210 ±.005 5.545 130.18 ±0.70 5.33 ±0.13 140.84 -865 BS1806-865 — — 5.250 ±.028 0.210 ±.005 5.670 133.35 ±0.70 5.33 ±0.13 144.01 -866 BS1806-866 — — 5.375 ±.028 0.210 ±.005 5.795 136.53 ±0.70 5.33 ±0.13 147.19 -867 BS1806-867 — — 5.500 ±.028 0.210 ±.005 5.920 139.70 ±0.70 5.33 ±0.13 150.36 -868 BS1806-868 — — 5.625 ±.028 0.210 ±.005 6.045 142.88 ±0.70 5.33 ±0.13 153.54 -869 BS1806-869 — — 5.750 ±.028 0.210 ±.005 6.170 146.05 ±0.70 5.33 ±0.13 156.71 -870 BS1806-870 — — 5.875 ±.028 0.210 ±.005 6.295 149.23 ±0.70 5.33 ±0.13 159.89 -872 BS1806-872 — — 6.125 ±.028 0.275 ±.006 6.675 155.58 ±0.70 6.99 ±0.15 169.56 -874 BS1806-874 — — 6.375 ±.028 0.275 ±.006 6.925 161.93 ±0.70 6.99 ±0.15 175.91 -876 BS1806-876 — — 6.625 ±.028 0.275 ±.006 7.175 168.28 ±0.70 6.99 ±0.15 182.26 -878 BS1806-878 — — 6.875 ±.028 0.275 ±.006 7.425 174.63 ±0.70 6.99 ±0.15 188.61 -880 BS1806-880 — — 7.125 ±.035 0.275 ±.006 7.675 180.98 ±0.90 6.99 ±0.15 194.96 -882 BS1806-882 — — 7.375 ±.035 0.275 ±.006 7.925 187.33 ±0.90 6.99 ±0.15 201.31 -884 BS1806-884 — — 7.625 ±.035 0.275 ±.006 8.175 193.68 ±0.90 6.99 ±0.15 207.66 -886 BS1806-886 — — 7.875 ±.035 0.275 ±.006 8.425 200.03 ±0.90 6.99 ±0.15 214.01
6.99 mm CS sizes 8 sizes
Other size charts History and explanation of BS 1806 What BS 1806 is BS 1806 standardized imperial O-Ring sizes for British industry using dash identification
similar to the US aerospace system that became AS568.
Why it overlaps AS568 Global aerospace and hydraulics pushed inch sizes toward one common geometry. BS 1806 and
AS568 share most dash families, so a -214 on a British legacy print is usually the same
target as AS568-214. Always confirm ID/CS if the revision is old or the bag marking is unclear.
BS 1806 vs BS 4518 BS 1806 - imperial dashes (this page)BS 4518 - metric ID × CSUsing this chart Find the dash series, confirm dimensions, then specify compound. Prefer the
AS568 chart when the print already says AS568.
