AS568

Red SAE J1926 ORB hydraulic fittings with black AS568 900-series boss O-Rings seated on the straight-thread studs

SAE J1926 ORB Boss O-Rings: AS568 900-Series Sizes That Actually Seal the Port

What SAE J1926 O-Ring Boss fittings need from the seal: AS568-901…932 boss O-Rings, how they differ from NPT and JIC, materials, install tips, and a Boss-only size chart.

Black rubber O-Ring with round cord cross-section measured by digital calipers on a printed size chart

The Master O-Ring Size Chart: What It Shows, Why It Helps, and Who It Is For

A practical guide to the handbook Master O-Ring Size Chart: multi-standard sizing, nearest-match search, tolerances, back-up rings, and who gets the most from it.

How to Measure an O-Ring With Your Phone: Inside Olypsys® Measurement Accuracy

How Olypsys® measures O-Rings with a smartphone, what actually drives its accuracy, and why gasket measurement is right around the corner.

Backup Ring Size Chart

AS568 back-up ring size chart: dash numbers with ID, width, height, and contour dimensions for high-pressure extrusion protection.

O-Ring Groove Calculator

Free O-Ring groove calculator. Pick a gland type and an AS568 dash number and get groove depth, width, corner radius, lead-in chamfer, squeeze, and gland fill.

O-Ring Groove & Gland Dimension Charts

The complete O-Ring groove reference: interactive gland dimension charts for radial, face, dovetail, hydraulic, pneumatic, and floating styles, plus squeeze, fill, extrusion, finish, and install chamfer guides.

How to Measure an O-Ring

How to measure O-Ring ID and cross-section with calipers, pi-tape, size cones, slide gauges, and lab vision systems, and why we recommend Olypsys® first.

Master O-Ring Size Chart

Filterable multi-standard O-Ring size chart, search by ID or cross-section across AS568, ISO, JIS, BS, DIN and more.

O-Ring Size Charts & Standards (AS568 & Metric)

AS568 and metric O-Ring size charts, dash numbers, groove design, and how to measure an existing seal.

O-Ring Weight Calculator

Free O-Ring weight calculator. Enter an AS568 dash number or your own inside diameter and cross-section, pick a compound, and get weight per piece, per thousand, and pieces per pound.