O-Ring Size Search
Search standard o-ring sizes across AS568, ISO 3601, Metric, and JIS B2401 standards. Enter a part number, dimension, or use the filters below to find your size. Click any result to view full specifications and request a quote directly from Wayne Rubber.
Need a custom o-ring size or non-standard compound?
Wayne Rubber manufactures custom o-rings to your exact specifications in any of our 12+ elastomer compounds.
About O-Ring Standards
AS568 Standard
The Aerospace Standard 568 is the primary o-ring sizing standard used in the United States. Maintained by SAE International, AS568 defines o-ring sizes in inches across four dash series: -0XX (1.78mm CS), -1XX (2.62mm CS), -2XX (3.53mm CS), -3XX (5.33mm CS), and -4XX (6.99mm CS). AS568 sizes are the most widely stocked and commonly specified in North American industrial applications.
ISO 3601 Standard
ISO 3601 is the international metric o-ring sizing standard used throughout Europe, Asia, and global supply chains. Dimensions are specified in millimeters. ISO 3601 is divided into four parts covering fluid power seals, general applications, quality acceptance criteria, and dimensional inspection. ISO sizes are essential for metric engineering applications and international OEM specifications.
Metric O-Ring Sizes
Metric o-rings follow a simple ID x CS millimeter designation (e.g. 20×3 means 20mm inside diameter, 3mm cross section). Metric sizes are widely used in European hydraulic and pneumatic systems, industrial machinery, and fluid power applications. Wayne Rubber can supply metric o-rings in all standard cross sections from 1.0mm to 7.0mm.
JIS B2401 Standard
The Japanese Industrial Standard JIS B2401 defines o-ring sizes used in Japanese-manufactured equipment. JIS sizes are organized into P-series (piston seals), G-series (general purpose), and V-series (vacuum applications). JIS o-rings are commonly required for Japanese automotive, hydraulic, and industrial equipment maintenance and OEM supply.
O-Ring Materials Available from Wayne Rubber
Wayne Rubber manufactures o-rings in all standard elastomer compounds. Material selection depends on your operating environment, chemical exposure, and temperature requirements.
- Nitrile (NBR) — oil and fuel resistance
- EPDM — water, steam, and weather
- FKM — high temp and chemical
- Silicone — food grade and extreme temps
- Neoprene (CR) — general purpose
- HNBR — high heat oil resistance
Not sure which material is right for your o-ring application? Use our chemical resistance guide to identify compatible compounds based on your fluid exposure and temperature requirements.