Value Collection ZMSCH90269 O-ring Dash 269 Buna-n 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90269 is a Dash 269 Buna-N (Nitrile Butadiene Rubber) O-ring designed for static and dynamic sealing applications in industrial, plumbing, and fluid-handling systems. It measures 8.75 inches inside diameter, 9 inches outside diameter, and 0.125 inches thick with a round cross section. The 90 durometer hardness rating places it in the extra-hard category, making it well-suited for high-pressure sealing where extrusion resistance is critical. Rated for service from -40 degrees F to 250 degrees F, this O-ring is compatible with petroleum-based fluids and hydraulic oils. Installation is performed by licensed plumbers, pipefitters, millwrights, and industrial maintenance technicians.

This O-ring is used in residential and commercial applications where large-diameter seals are required, including pump housings, valve bodies, cylinder heads, filter housings, and pipe flanges. Buna-N material is the most widely used O-ring elastomer in fluid-power and petroleum-service environments. Its excellent compression set resistance and tear and abrasion resistance make it a standard choice for demanding sealing points. Sold in packages of 10, this SKU is practical for service contractors who maintain multiple units or require spares on hand. It meets SAE and MIL-Spec standards.

Key Features

• Buna-N (Nitrile) elastomer with excellent resistance to petroleum products and hydraulic fluids
• 90 durometer extra-hard rating for high-pressure extrusion resistance
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross section, 0.125 inches thick, Dash 269 standard sizing
• Meets SAE and MIL-Spec standards
• Sold in packages of 10 with a minimum order quantity of 1 package

Compatibility

Compatible with petroleum products and petroleum-based hydraulic fluids. Designed as an OEM-style replacement or maintenance seal for large-diameter O-ring grooves requiring a Dash 269 cross-section profile. Not recommended for exposure to ozone, direct sunlight during storage, or electrical equipment that generates ozone.

Installation Notes

Installation is typically performed by licensed plumbers, pipefitters, or industrial maintenance technicians. Depressurize and drain the system fully before removing the old seal and installing the replacement O-ring. Lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to prevent tearing during assembly. Do not store Buna-N O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure degrade the elastomer.