Value Collection ZMSCH70357 O-ring Dash 357 Nbr Pack of 5

Product Description

The VALUE COLLECTION ZMSCH70357 is a Dash 357 Nitrile Butadiene Rubber (NBR) O-ring with a round cross section, sold in a pack of 5. It measures 5.5 inches inside diameter, 5.875 inches outside diameter, and 0.1875 inches thick. Rated at 70 Shore A hardness, this O-ring is designed for static and dynamic sealing applications where petroleum-based fluids are present. It carries SAE and MIL-Spec standards compliance and operates across a temperature range of -40 degrees F to 250 degrees F. Licensed plumbers, HVAC technicians, and fluid-system technicians typically install this part in industrial and commercial fluid-handling equipment.

This O-ring is suited for sealing applications involving petroleum products, hydraulic fluids, and mineral oils in plumbing, HVAC, and general industrial systems. Its large diameter makes it appropriate for flanged connections, large-bore fittings, pump housings, or valve assemblies where a robust seal is required. The pack quantity of 5 supports service calls requiring multiple replacements or stocking common seal sizes on a service vehicle.

Key Features

• Nitrile Butadiene Rubber (Buna-N) compound provides excellent resistance to petroleum products and hydraulic fluids
• 70 Shore A hardness rating offers strong compression set resistance and tear and abrasion resistance
• Round cross-section profile ensures consistent seating in standard O-ring grooves
• Rated for temperatures from -40 degrees F to 250 degrees F for broad service range
• Meets SAE and MIL-Spec standards for verified dimensional and material compliance
• Pack of 5 units per package with a minimum order quantity of 1

Compatibility

Compatible with petroleum products, hydraulic fluids, and mineral oils. Not recommended for use with ozone-generating environments, direct sunlight exposure, or equipment producing ozone such as electric motors. Designed as a standard Dash 357 O-ring replacement for any application requiring a 5.5-inch ID, 5.875-inch OD, 0.1875-inch thick round cross-section seal.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanic familiar with fluid-system sealing procedures. De-energize all pressure and power sources and relieve system pressure before removing the existing O-ring. Inspect the groove for nicks, burrs, or contamination before seating the new ring. Do not stretch or twist the O-ring during installation, and avoid using sharp tools that may damage the sealing surface.