O-rings used for sealing straight-thread tube fittings on a boss. The standard sizes for o-rings include 20 sizes used to seal straight-thread tube fittings on a boss. A boss is a ± cylindrical projection on a casting or forging. The end of that projection is machined to provide a flat, smooth. 0.30 surface for sealing.

Technical Handbook O-rings The following tables list approximately 2000 O-ring sizes in order by inside diameter. These O-ring sizes correspond to US Standard AS568, British Standard, Swedish, as well as many common metric sizes according to DIN and ISO standards. Most of these sizes are readily available from ERIKS stock in:

Standard O-Ring Sizing Chart O-Ring Size # Actual I.D. Inches Actual C.S. Inches Nominal Reference I.D. Nominal Reference C.S. Nominal

(b) This chart provides dimensions for standard (AN) shrinkage materials ONLY. These correspond to AS568A dimensions. O-rings manufactured out of compounds with different shrinkage rates (other than AN) will produce slightly different dimensions

Full-size representations of our Standard Size O-Rings are displayed. This new version has more O-Rings illustrated, including Precision Associates’ own extended stan-dards. We debut our latest innovation with this publication - 5/32” nominal cross section O-Rings.

Common Metric O-Rings Sizes Tolerances var y by use, please see our tolerance pages. Thousands of non-standard sizes are available in stock or can be made within a few weeks typically without tooling fees so no need to settle for a less than optimal fit. Size CS (IN) ID (IN) OD (IN) CS (MM) ID (MM) OD (MM) 0.5X1.3 0.020 0.051 0.091 0.50 1.30 2.30

o-ring size chart and installation data as-568a series nominal size actual dimensions i.d. o.d. width i.d. tol. w. tol.-001 1/32 3/32 1/32 .029±.004 .040+.003-001 1/2 1/16 1/8 1/32 .070±.004 .040±.003-002 3/64 9/64 3/64 .042±.004 .050±.003-003 1/16 3/16 1/16 .056±.004 .060±.003-004 5/64 13/64 1/16 .070±.005 .070±.003

This standard identifies O-Ring sizes by the ID x C/S, and may be followed by a letter indicating the quality level (N - normal quality; S - special quality), and a code indicating the rubberpolymer and IRHD hardness.

O-Rings manufactured out of compounds with different shrinkage rates (other than AN) will produce slightly different dimensions and tolerances.

Contact us today: 800.275.9006 [email protected] visit us at www.amesrubberonline.com ARM O-Ring Size Chart Standard O-ring Size Chart 2- I.D. O.D. W I.D. W I.D. W