Value Collection ZMSCH70MD318 Dash 318 Nitrile O-ring 5-pack

Product Description

The VALUE COLLECTION ZMSCH70MD318 is a Dash 318 Buna-N (Nitrile Butadiene Rubber) O-ring with a 0.975 inch inside diameter, a 1.375 inch outside diameter, and a 0.1875 inch cross-section thickness. Rated at 70 Shore A hardness, this black round-section O-ring is sold in a pack of five. It seals fluid and gas connections across plumbing, HVAC, hydraulic, and general mechanical applications. Licensed tradespeople and maintenance technicians install this type of O-ring in fittings, valves, pumps, and manifolds where petroleum-based fluid compatibility is required.

Buna-N is the most widely used O-ring elastomer in trade work. It is well suited for residential and light commercial plumbing systems, HVAC refrigerant-side and oil-side joints, hydraulic assemblies, and pneumatic fittings where the working fluid is a petroleum product or petroleum-base lubricant. Operating temperature range runs from -40 degrees F to 250 degrees F, making this O-ring appropriate for a broad range of service conditions encountered in the field.

Key Features

• Buna-N (Nitrile) material delivers excellent resistance to petroleum products, oils, and fuels
• 70 Shore A hardness rating provides reliable compression set and sealing force under mechanical load
• Round cross-section profile fits standard O-ring grooves machined to AS568 Dash 318 dimensions
• Rated from -40 degrees F to 250 degrees F for wide service temperature coverage
• Good tear and abrasion resistance extends service life in dynamic and static sealing applications
• Pack of 5 supports single-repair and multi-unit service calls from one package

Compatibility

Designed as an OEM-style replacement or service O-ring for any application requiring a standard AS568 Dash 318 O-ring groove. Compatible with petroleum-based fluids, oils, and lubricants. Not recommended for exposure to ozone, direct sunlight during storage, or applications requiring FDA food-contact compliance.

Installation Notes

O-ring replacement is performed by plumbers, HVAC technicians, and mechanical service trades. Always depressurize and shut off fluid supply to the assembly before removing the old O-ring. Lightly lubricate the new O-ring with a compatible petroleum-based or silicone grease before seating it in the groove to prevent pinching or tearing during assembly. Avoid twisting the O-ring during installation, as a twisted ring will not seal correctly and will fail prematurely.