O-Ring Glossary

AF: Air Force
AMS: Aerospace Material Specification
AN: Air Force-Navy
AS-568A: Aerospace Standard Uniform Dash Numbering system for O-rings Clearance
Diametral:The difference in diameters of two surfaces to be sealed
Cross-Sectional Dia (C/S): One half the difference between the ID and OD of an O-ring (W)
Dynamic Seal: An application where an O-ring is to seal two parts which are in motion
Elongation: Percent of stretch before breaking
Extrusion: The extension, under pressure, of a portion of an O-ring into the clearance between mating parts
Face Seal: An application where an O-ring seals in a plane perpendicular to its axis
Flash: Excess rubber left around an O-ring at mold parting lines
Gland: Seal assembly, including O-ring, groove and contacting surfaces
Groove: The recess into which an O-ring is fitted
Hardness: Property usually measured with a Shore A Durometer. A reading of 40 is soft, 90 is hard
ID: The inside diameter of an O-ring
MIL: Military
Modulus: Stress at 100% elongation
MS: Military Standard
OD: The outside diameter of an O-ring
SAE: Society of Automotive Engineers
Seal: An O-ring that prevents fluid flow Set, Compression: Permanent distortion of an O-ring after compression
Squeeze: Cross-sectional compression of an O-ring
Static Seal: An O-ring designed to function between parts having no relative motion, a gasket
Tensile: The pulling strength before breaking, measured in pounds per square inch
W: The cross-sectional diameter of an O-ring(C/S)

Hypalon® and Viton® are registered trademarks of DuPont® Dow Elastomers.

About Monroe

Experience

Over 60 years of manufacturing experience to best serve our customers

Read More >>

Capabilities

Monroe provides custom manufacturing solutions to clients throughout the world

Read More >>

Values

Our knowledge, customer service & processes are structured to reduce delivery times, improve quality & cut costs

Read More >>

Commitment

Monroe is committed to customer satisfaction, we strive for continuous improvement in our products and our people.

Read More >>

The information contained in this website is for general information purposes only. The information is provided by Monroe Engineering, LLC, Inc. (Monroe) and while we endeavour to keep the information up-to-date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk. All users should evaluate product suitability for each intended application of that product under actual use conditions. In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from this information.

How can we help? Submit an RFQ