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O-RINGS An O-Ring is a loop of elastomer with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. O-Rings are one of the most common seals used in machine design because they are inexpensive and easy to make, reliable and have simple mounting requirements. TH E R EF ER S TO D UR O M ET ER . SS A R D NE M A TE R IA L H
Siz ing
O-Rings are denoted using a numbering (ID) system that references an Inside Diameter (CS). n and Cross Sectio are Be careful in measuring O-Rings that damaged or stretched from removal.
FRONT VIEW
SIDE VIEW
CROSS SECTION
Cross Cross
Section
Section
(CS)
Flash
(CS)
.005" max. typical
Consider using an O-Ring cone, found on page 86, for measuring.
Inside
Inside
Diameter
Diameter
(ID)
(ID)
Flash .003" max. typical
Outside
Cross section is also commonly . referred to as the O-Ring's width
Diameter (OD)
O-RIN G SEAL TYPES MALE SEAL
MALE SEAL
An O-Ring is installed in a groove that is machined into the Outside Diameter (OD) of the “piston.” The piston and the installed O-Ring are then inserted into the bore. The O-Ring seals radially.
FEMALE SEAL
FACE SEAL
FEMALE SEAL
An O-Ring is installed in a groove that is machined into the ID of the bore. The rod in then inserted into the bore through the O-Ring. The O-Ring seals radially.
FACE SEAL
An O-Ring is installed in a groove that is machined into a flat face around a hole. A second flat face then seals against the O-Ring. The O-Ring seals axially.
Several O-Ring seal types exist. Listed here are the most common.
SPECIAL O-RING SEAL TYPES
Spe cia l Or der Quad / x-Rings Square Rings Back Up Rings
900 Series:
Straight Thread Tube Fitting Bosses 900 Series O-Rings are also known as Boss Seals. These O-Rings are primarily used for hydraulic tubing and straight threads to create a seal under compression.
All manufacturer names and numbers are for cross reference identification purposes only. In no way are we implying that our parts were made by the manufacturers listed. Prices, materials, dimensions, tolerances, designs and grades subject to change without notice. © Huyett 2022
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REVISED 05-22