Value Collection ZMSCH70258 O-ring Dash 258 Buna-n 10-pack

Product Description

The VALUE COLLECTION ZMSCH70258 is a Dash 258 Nitrile Butadiene Rubber (Buna-N) O-ring sized at 6 inches inside diameter, 6.25 inches outside diameter, and 0.125 inches thick with a round cross section. Buna-N is the most widely used O-ring elastomer in trade and industrial applications, offering excellent resistance to petroleum-based fluids, strong compression set recovery, and solid tear and abrasion resistance. Rated at 70 Shore A hardness, this O-ring is suited for use in systems that demand a reliable, chemically compatible static or dynamic seal. Plumbers, HVAC technicians, and mechanical service professionals specify Buna-N seals for a wide range of fluid-handling assemblies.

This O-ring is appropriate for residential and commercial applications involving petroleum products, hydraulic fluids, and general-purpose fluid sealing. It is commonly installed in pipe flanges, valve bodies, pump housings, and similar assemblies where a dependable elastomeric seal is required. The working temperature range spans -40 degrees F to 250 degrees F, covering most standard mechanical and HVAC system operating conditions. Each package contains 10 O-rings, making it practical to stock spares for routine maintenance calls.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 70 Shore A durometer hardness rated Hard for positive sealing under compression
• Round cross section, Dash 258 standard sizing for straightforward replacement sourcing
• Working temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Packaged in quantities of 10 to support stocking and repeat service calls

Compatibility

Compatible with petroleum products and petroleum-based fluid systems. Designed as an OEM-style Dash 258 replacement O-ring for any application requiring a 6 inch ID, 6.25 inch OD, 0.125 inch thick Buna-N seal. Should not be used in contact with ozone-generating sources, direct sunlight exposure during storage, or near motors and electrical equipment that produce ozone.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or mechanical service professionals. Always shut off fluid supply and relieve system pressure completely before removing or seating any O-ring seal. Inspect the groove and mating surfaces for burrs or debris before installation; a clean, undamaged groove is critical to achieving a proper seal. Apply a compatible lubricant to ease installation and avoid twisting or rolling the O-ring during seating.