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 This calculator allows you to find the recommended O-Ring inner diameter and range of cross section diameters that will fit a given gland size and tolerance range in a radial seal.
Inputs
 Bore diameter, Bd: mm cm in Bore Tolerance, Btol: mm cm in Groove Diameter, Gd: mm cm in Groove Tolerance, Gtol: mm cm in O-Ring maximum compression, Cmax: % O-Ring minimum compression, Cmin: % O-Ring cross-section diameter tolerance, CStol: mm cm in
 Max. cross-section diameter (excl. tol.), CSmax: 0.068  in mm cm in Min. cross-section diameter (excl. tol.), CSmin: 0.065  in Your input CS tolerance, CStol: 0.003  in Industry-recommended CS tolerance: 0.003  in Recommended O-Ring inner diameter, IDrec: 0.392  in Suggested groove width, GW: 0.103  in

Equations Behind the Calculator
 This calculator implements the following two equations to determine the bounds on the cross-section diameter CS, The recommended tolerance is based on the cross-section diameter, and is found from the following table:
 Cross Section Diameter (inch) Recommended Tolerance(inch) CS < 0.104 0.003 0.104 < CS < 0.139 0.004 0.139 < CS < 0.210 0.005 0.210 < CS < 0.275 0.006 0.275 < CS 0.008
 The recommended inner diameter is found by stretching the O-Ring circumference by 2% over the minimum Groove Diameter, The suggested groove width follows from, More information is provided on the Design Guideline page.
Glossary
Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.