Manufactured by Hercules Sealing Products, this 95A durometer urethane backup ring is designed to prevent extrusion of primary seals in hydraulic and pneumatic cylinder applications. The 95A Shore A hardness rating indicates a firm, resilient urethane compound well-suited for use in dynamic sealing environments where pressure and movement place stress on adjacent seals.
The Hercules 95A Durometer Urethane Backup Ring is commonly paired with O-rings or other elastomeric seals to extend service life and maintain sealing integrity under pressure. Urethane construction offers good resistance to abrasion and wear, making it a practical choice for demanding linear actuator and cylinder assemblies.
SKU: 575-319
Supplier Part Number (MPN): 575-319
Alternate Part Numbers: C1BV30, MI-01810983, MINO-00407Q30753
Loading related products…
Specifications
Alternate Part Numbers
Alternate Part NumberC1BV30, Alternate Part Number MI-01810983, Alternate Part Number MINO-00407Q30753
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Supplier Part Number
575-319
Product Weight
0.01 lbs
Product Questions & Answers (2)
Question by: Wayne H on Dec 30, 2025, 2:24 PM
what exactly is a backup ring used for in a hydraulic setup, and why would i need one made out of urethane?
Answer by: Customer Support on Jan 1, 2026, 6:01 AM
Backup rings sit behind a primary seal to keep it from extruding into the clearance gap under pressure. Without one, a softer seal can get pinched or pushed out of its groove over time, especially in high-pressure applications. Urethane at 95A durometer is a firm, tough material that holds its shape well and resists that kind of deformation, making it a solid choice when you need extra support behind your main seal in hydraulic systems.
Question by: Dwayne W on Sep 11, 2025, 2:11 PM
What's the hardness on these urethane backup rings?
Answer by: Customer Support on Sep 13, 2025, 6:54 AM
They're made from 95A durometer urethane, which should give you a good balance of flexibility and resistance to wear.
