Crafted for durability and reliability, the Hercules Urethane Backup Ring 90A Durometer is an essential component in hydraulic systems. Made from high-quality urethane material, this backup ring offers excellent resistance to wear and tear, ensuring long-lasting performance in demanding industrial environments. It is specifically designed to prevent extrusion and maintain seal integrity under high pressure, making it ideal for use in hydraulic cylinders and pumps.
The 90A durometer hardness rating provides a balance between flexibility and strength, enhancing the ring's ability to function effectively under varying pressure conditions. This product is compatible with a wide range of hydraulic fluids, ensuring versatility across different applications. It is an indispensable element for maintaining system efficiency and reducing downtime in industrial machinery.
SKU: 575-123
Supplier Part Number (MPN): 575-123
Alternate Part Numbers: C1BU22, MI-01260148, MINO-00407X80014
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Specifications
Alternate Part Numbers
Alternate Part NumberC1BU22, Alternate Part Number MI-01260148, Alternate Part Number MINO-00407X80014
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Supplier Part Number
575-123
Product Weight
0.01 lbs
Product Questions & Answers (1)
Question by: Clint R on Dec 17, 2025, 8:56 AM
backup ring like this one, is the 90A durometer pretty standard for hydraulic cylinder work, or is that on the stiffer side?
Answer by: Customer Support on Dec 18, 2025, 9:08 AM
90A puts it on the firmer end of the urethane range, which is actually what you want for backup ring duty. Softer materials tend to extrude under pressure, and a backup ring's whole job is to keep the primary seal from getting pushed into the hardware gap. Urethane at 90A holds its shape well under load, so it's a solid choice for hydraulic cylinder applications where extrusion resistance matters.
