Value Collection ZMSCH1X4.5 O-ring 4.5 in Id Buna-n

Product Description

The VALUE COLLECTION ZMSCH1X4.5 is a Buna-N (Nitrile Butadiene Rubber) O-ring engineered for sealing applications where resistance to petroleum-based fluids is required. With a 4.5-inch inside diameter, 6.5-inch outside diameter, and 1-inch cross-section thickness, this O-ring seats in large-bore grooves found in pumps, valves, compressors, and hydraulic assemblies. The round cross-section profile provides consistent compression and reliable sealing under dynamic or static load. Rated at 70 durometer, it balances flexibility and resistance to deformation. Operating temperature range spans -40 degrees F to 250 degrees F. It is installed by HVAC technicians, plumbers, and industrial mechanics working on fluid-handling and refrigerant-adjacent systems.

This O-ring is suited for use in residential and commercial applications involving petroleum-based fluids, hydraulic oil, fuels, and lubricants. Typical installation scenarios include large pump housings, valve bodies, compressor end caps, and pipe flanges where a robust elastomeric seal is needed. It meets SAE and MIL-Spec standards, making it appropriate for both general trade and specification-driven maintenance work. Each package contains 100 O-rings. Buna-N is the most widely used O-ring elastomer in trade applications and is a standard stock item across HVAC, plumbing, and industrial service.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent resistance to petroleum products, hydraulic fluids, and lubricants
• 70 durometer hardness rating provides firm compression set with strong tear and abrasion resistance
• Wide service temperature range: -40 degrees F to 250 degrees F
• Round cross-section for consistent groove seating in standard O-ring channels
• Meets SAE and MIL-Spec standards
• Black color; package quantity of 100 units per order

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and lubricants. Designed as a standard Buna-N O-ring replacement for large-bore pump, valve, compressor, and hydraulic assembly sealing applications. Not recommended for use with ozone exposure, direct sunlight storage, or near motors and electrical equipment that generate ozone.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or qualified mechanics. Always depressurize and isolate the system before removing the old O-ring and inspect the groove for nicks or debris that could compromise the seal. Lightly lubricate the O-ring with a compatible fluid prior to installation to prevent tearing during assembly. Avoid storing Buna-N O-rings in direct sunlight or near ozone-generating equipment to preserve elastomer integrity.