There are three Dimensions that you need in order to obtain the perfectly sized O-Ring for your application. These are the Outside Diameter (OD) 

Any O-Ring Size USA AS568 O-Rings, 2- Parker O-Rings, Japanese JIS O-Rings, Metric O-Rings, BS British BS1806 O-Rings. Custom O-Ring Sizes Typically Without Tooling or Set Up Fees with Rush Delivery options O-Ring Technical References O-Ring Material Selection Reference Guides Popular O-Ring Material Comparison Guide FFKM Kalrez® O-Rings Material

Metric O-ring MM dimensions sizes. Millions of metric and custom o-rings in stock by O-Rings West. CCR Registered, ITAR Registered, Cage Code: 1LFP5, PPAP Reports, Conflict Minerals Compliant SAE, ASTM and Military Specifications ISO 9001: Compliant. Call 425-967-5732 1-888-722-2602. Fax

O-Ring Standard Size AS 568A, BS 4518, GB/T 3452.1, JIS B 2401, Metric, Swedish SMS 1586 Of the many kinds of sealing technology available in products manufacturing and machine design, the use of the o-ring is perhaps the most common and extensive.

O‑ring Sizes: Standard and Metric O‑ring Sizes: Standard and Metric O‑ring Sizes: Standard Size Nominal Size Nominal Size inches inches ID Width

KOOTANS 1200Pcs Nitrile Rubber O Ring Kit 24 Sizes O Rings Assortment Kit Set Sealing Washer NBR Metric o-Ring Assortment for Plum , Gas, Automotive and 

O-Ring Size Chart Dimensions Browse in-depth charts on o-ring and sealing product sizes to find the right seal for your application. View Guide O-Ring Tolerances Guide View inside diameter and cross section tolerance levels for o-rings in different size measurements. View Guide O-Ring Gland Design Guide Groove design is critical to o-ring success.

O-Ring Size Chart Dimensions Browse in-depth charts on o-ring and sealing product sizes to find the right seal for your application. View Guide O-Ring Tolerances Guide View inside diameter and cross section tolerance levels for o-rings in different size measurements. View Guide O-Ring Gland Design Guide Groove design is critical to o-ring success.

O-Ring Size Chart Dimensions Browse in-depth charts on o-ring and sealing product sizes to find the right seal for your application. View Guide O-Ring Tolerances Guide View inside diameter and cross section tolerance levels for o-rings in different size measurements. View Guide O-Ring Gland Design Guide Groove design is critical to o-ring success.

Depending on the size, this measurement could be in millimeters or inches. Step 2 Measure the Cross-Section. The cross-section, or CS, is the width or thickness of the seal. The best way to measure this is with a vernier caliper. Place the o-ring in the caliper without squeezing it to get this measurement.

Japanese Industrial Standard for o-ring sizes. This standard, often referred to as “Japanese Metrics.” JIS B 2401 Size Chart View Size Chart IS0 6149 ISO 6149 specifies o-rings designed