Value Collection ZMSCH90253 O-ring Dash 253 Buna-n

Product Description

The VALUE COLLECTION ZMSCH90253 is a Dash 253 Buna-N (Nitrile Butadiene Rubber) O-ring sized at 5.375 inches inside diameter, 5.625 inches outside diameter, and 0.125 inches thick. Rated at 90 durometer (Extra Hard), this round cross-section seal is engineered for static and dynamic sealing applications in systems that involve petroleum-based fluids. It operates across a temperature range of -40 degrees F to 250 degrees F, making it suitable for a wide range of industrial, HVAC, plumbing, and hydraulic service environments. Licensed tradespeople and maintenance professionals install this seal type as a standard consumable during equipment overhaul, pump service, and valve maintenance.

This O-ring is intended for use in applications where petroleum product exposure is present, including hydraulic systems, fuel handling equipment, and oil-based lubrication circuits. The Buna-N compound provides excellent resistance to petroleum products along with strong compression set performance and good tear and abrasion resistance. It conforms to SAE and MIL-Spec standards, making it appropriate for both commercial and light industrial service. This part is sold in a package quantity of 25 with a minimum order quantity of 1 package.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material with excellent petroleum product resistance
• 90 durometer Extra Hard rating for demanding sealing applications
• Operating range from -40 degrees F to 250 degrees F
• Conforms to SAE and MIL-Spec standards
• Round cross-section Dash 253 profile — 5.375 inches ID, 5.625 inches OD, 0.125 inches thick
• Sold in a pack of 25 units

Compatibility

Compatible with petroleum-based products and fluids. Designed as an OEM-style replacement or service seal for hydraulic, fuel, oil, and related systems requiring a Dash 253 Buna-N O-ring. Not recommended for use with ozone-generating equipment or in direct sunlight storage environments. Not FDA approved.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, hydraulic technicians, or HVAC mechanics depending on the application. Power down or depressurize the system completely before removing the old seal. Clean the groove and mating surfaces before seating the new O-ring to prevent debris-related leaks or extrusion damage. Avoid stretching the O-ring excessively during installation, and do not store unused seals near motors, electrical equipment, or direct sunlight, as ozone and UV exposure degrade Buna-N material.