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HERCULES URETHANE BACKUP Ring 90A DUROMETER

Description & Features

This Hercules Sealing Products backup ring is made from 90A durometer urethane, providing reliable support and preventing extrusion in demanding hydraulic applications.

The HERCULES URETHANE BACKUP Ring 90A DUROMETER is designed to withstand high pressures and maintain sealing integrity. It is suitable for use with various hydraulic fluids and is compatible with standard groove dimensions.

SKU: 575-352

Supplier Part Number (MPN): 575-352

Alternate Part Numbers: C1BV61, MI-01263798, MINO-00407X80424

Specifications

Alternate Part Numbers Alternate Part Number C1BV61, Alternate Part Number MI-01263798, Alternate Part Number MINO-00407X80424	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Supplier Part Number 575-352	Product Weight 0.01 lbs

Product Questions & Answers (1)

Question by: Freddie A on Aug 7, 2025, 7:13 PM

backup ring like this one, is the 90A durometer rating gonna hold up in a standard hydraulic cylinder without extruding under pressure?

Answer by: Customer Support on Aug 9, 2025, 6:21 AM

90A durometer urethane is a pretty firm material, which is exactly what you want in a backup ring. Its whole job is to keep the primary seal from pushing into the clearance gap under pressure. Urethane at that hardness handles that role well in typical hydraulic cylinder applications without cold-flowing or deforming the way softer materials tend to.