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HERCULES 95A DUROMETER URETHANE BACKUP RING

Alternate Part Numbers Alternate Part Number C1BV30, 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

Product Questions & Answers

what exactly is a backup ring used for in a hydraulic setup, and why would i need one made out of urethane?

Question by: Wayne H on Dec 30, 2025, 2:24 PM

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.

Answer by: Customer Support on Jan 1, 2026, 6:01 AM

What's the hardness on these urethane backup rings?

Question by: Dwayne W on Sep 11, 2025, 2:11 PM

They're made from 95A durometer urethane, which should give you a good balance of flexibility and resistance to wear.

Answer by: Customer Support on Sep 13, 2025, 6:54 AM