Value Collection ZMSCH90263 Nbr O-ring Dash 263

Product Description

The VALUE COLLECTION ZMSCH90263 is a Dash 263 O-ring made from Nitrile Butadiene Rubber (Buna-N), designed for static and dynamic sealing applications across industrial, plumbing, and fluid-handling systems. It measures 7.25 inches inside diameter and 7.5 inches outside diameter, with a cross-section thickness of 0.125 inches. The compound is rated at 90 durometer, placing it in the extra-hard hardness range. The operating temperature window runs from -40 degrees F to 250 degrees F. Buna-N is the most widely used O-ring elastomer in the trade, valued for its strong resistance to petroleum-based fluids, good compression set performance, and solid tear and abrasion resistance.

This O-ring is suited for use in hydraulic systems, pneumatic assemblies, pumps, pipe flanges, valves, and general fluid-sealing applications where petroleum products are present. Its large diameter makes it appropriate for shaft seals, large-bore fittings, and tank or housing cover seals in both residential and commercial installations. Plumbers, pipefitters, industrial maintenance techs, and HVAC mechanics working on oil-bearing systems will encounter this size in equipment cover gaskets and pump seal assemblies. Each package contains 10 O-rings.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material with excellent resistance to petroleum products and hydraulic fluids
• Extra-hard 90 durometer rating provides high resistance to extrusion under pressure
• Wide temperature range from -40 degrees F to 250 degrees F suits demanding thermal cycles
• Round cross-section profile conforms to standard Dash 263 O-ring groove dimensions
• Meets SAE and MIL-Spec standards for material and dimensional compliance
• Packaged in quantities of 10 per pack with a minimum order quantity of 1

Compatibility

Compatible with petroleum products and petroleum-based fluids. Should not be used in contact with ozone, direct sunlight exposure during storage, or near motors and electrical equipment that generate ozone. Designed as a standard Dash 263 replacement O-ring for any application requiring a 7.25-inch inside diameter Buna-N seal.

Installation Notes

O-ring installation should be performed by qualified plumbers, pipefitters, or industrial mechanics following applicable system shutdown and pressure-relief procedures before disassembly. Inspect the groove for nicks, burrs, or contamination before seating the O-ring. Apply a compatible lubricant to ease installation and prevent rolling or twisting during assembly. Do not overstretch the O-ring during installation, as permanent deformation will compromise the seal.