Measuring

How to Measure

Click on the images below for more information.

Seal Dimensions

Key: I.D. = Inside Diameter   O.D. = Outside Diameter   H = Height   C/S = Cross Section = (O.D. - I.D.)/2

Measurements for a typical O-ring

O-Ring Measurements

Measurements for a typical U-seal

U-Seal Measurements

Measurements for a typical wiper

Wiper Measurements

Measurements for a typical piston cup

Piston Cup Measurements

Measurements for a typical V-packing set

V-Packing Set Measurements
Metal Dimensions

Wiper Key:

R = Rod - Wiper I.D.

Dw = Groove Diameter - Wiper O.D.

Ww = Groove Width - Wiper Heel Height

Rod Seal Key:

R = Rod - Rod Seal I.D.

Dr = Groove Diameter - Rod Seal O.D.

Wr = Groove Width - Rod Seal Height

Gland Seal (usually an O-ring) Key:

Dg = Groove Diameter - Gland Seal I.D.

Wg = Groove Width - Gland Seal Cross Section

Piston Seal Key:

B = Bore - Piston Seal O.D.

Dp = Groove Diameter - Piston Seal I.D.

Wp = Groove Width - Piston Seal Height

Measurements for a typical cylinder

Cylinder Measurements