How to Measure
Click on the images below for more information.
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||Measurements for a typical U-seal|
|Measurements for a typical wiper||Measurements for a typical piston cup|
|Measurements for a typical V-packing set|
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