Value Collection ZMSCH70277 O-ring Dash 277 Nitrile Nbr

Product Description

The VALUE COLLECTION ZMSCH70277 is a Dash 277 O-ring made from Nitrile Butadiene Rubber (NBR), also known as Buna-N, designed for static and dynamic sealing applications in fluid and pneumatic systems. It measures 11.5 inches inside diameter, 11.75 inches outside diameter, and 0.125 inches thick, with a round cross section. Shore hardness is rated at 70, placing it in the hard range. Licensed HVAC technicians, plumbers, and mechanical contractors install this style of O-ring as a sealing element in flanged connections, valve bodies, pump housings, and similar assemblies.

This O-ring is suited for use in systems that handle petroleum-based fluids, hydraulic oil, fuel, and general industrial lubricants. Its Buna-N compound provides excellent resistance to petroleum products, along with strong compression set resistance and good tear and abrasion resistance. The operating temperature range spans from -40 degrees F to 250 degrees F, making it appropriate for both refrigeration and moderate-temperature heating system components. It ships in a package quantity of 5 and carries SAE and MIL-Spec compliance.

Key Features

• Buna-N (NBR) compound — the most widely used O-ring elastomer for petroleum-fluid compatibility
• Shore hardness of 70 for reliable compression set resistance in sealing applications
• Operating range of -40 degrees F to 250 degrees F suits both low-temperature and moderate-heat environments
• Round cross section; Dash 277 standard sizing for drop-in replacement fitment
• Compliant with SAE and MIL-Spec standards
• Sold in a package quantity of 5 per order

Compatibility

Designed as a standard Dash 277 O-ring replacement for equipment requiring an 11.5-inch ID sealing element compatible with petroleum products, hydraulic fluids, and similar media. Not recommended for use with ozone-generating environments, direct sunlight exposure, or electrical equipment that produces ozone.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or mechanical contractors during valve, pump, or flange service. De-pressurize and isolate the system before removing the old O-ring. Clean the gland thoroughly and inspect for damage before seating the new O-ring. Avoid storing Buna-N O-rings near motors, ozone-producing equipment, or in direct sunlight, as ozone and UV exposure degrade the compound over time.