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90A Durometer Urethane Back-Up Rings -011 Dash Size, Per Pack

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Description & Features

These 90A Durometer Urethane Back-Up Rings provide reliable extrusion resistance in hydraulic applications. Molded from high-quality 90A durometer urethane, these back-up rings are designed for easy installation, stretching for placement and quickly returning to their original size. Each pack contains ten back-up rings, sized to correspond with standard O-Ring dimensions.

These Hercules Sealing Products back-up rings are suitable for use in systems with operating temperatures from -65°F to 220°F. These -011 dash size rings are identified by catalog number C1BT73 and alternate part number C1BT73.

SKU: 575-011

Supplier Part Number (MPN): 575-011

Alternate Part Numbers: C1BT73

Specifications

Brand
HERCULES® SEALING PRODUCTS
Dash Size
11
Durometer
95A
Inside Diameter
0.31 in
Material
Urethane
Series
575 Series
Suitable For Use With
Hydraulic and Pneumatic Cylinders
System of Measurement
Imperial

Product Questions & Answers (2)

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Question by: Lyle S on Oct 31, 2025, 10:05 AM
these back-up rings stretch for install and then snap back to size? just want to make sure i ain't gotta fight 'em into place on the job
Answer by: Customer Support on Nov 1, 2025, 8:08 PM
That's how they work. The urethane material lets you stretch them over for installation, and they return to their original shape pretty quickly once in place. Makes the job a good bit easier than dealing with rigid backup rings that need special tools or heating to fit.
Question by: Duane H on Nov 30, 2025, 5:59 PM
So, these back-up rings...they go *behind* the o-rings, right? Just tryna make sure I get it right before I order.
Answer by: Customer Support on Dec 2, 2025, 2:44 PM
That's exactly right. These back-up rings are designed to be installed behind O-rings to prevent extrusion in high-pressure applications.

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