eFunda: Radial O-Ring Selector

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, B_d:
Bore Tolerance, B_tol:
Groove Diameter, G_d:
Groove Tolerance, G_tol:
O-Ring maximum compression, C_max:		%
O-Ring minimum compression, C_min:		%
O-Ring cross-section diameter tolerance, CS_tol:

Answers

Max. cross-section diameter (excl. tol.), CS_max:	0.068 in
Min. cross-section diameter (excl. tol.), CS_min:	0.065 in
Your input CS tolerance, CS_tol:	0.003 in
Industry-recommended CS tolerance:	0.003 in
Recommended O-Ring inner diameter, ID_rec:	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