Value Collection ZMSCH70372 O-ring Dash 372 Nbr 5 Pack

Product Description

The VALUE COLLECTION ZMSCH70372 is a Dash 372 Buna-N (Nitrile Butadiene Rubber) O-ring used to create reliable fluid and pressure seals in mechanical assemblies. It measures 8.75 inches inside diameter, 9.125 inches outside diameter, and 0.1875 inches (3/16 inches) thick with a round cross section. Rated for service from -40 degrees F to 250 degrees F, this NBR compound delivers excellent resistance to petroleum-based fluids along with strong compression set, tear resistance, and abrasion resistance. Each package contains 5 O-rings. Licensed HVAC techs, plumbers, and industrial maintenance professionals rely on Buna-N as the go-to elastomer for oil, fuel, and hydraulic sealing applications.

This O-ring is suited for hydraulic cylinders, pneumatic fittings, pump housings, valve stems, and other assemblies exposed to petroleum products, oils, and fuels. The Dash 372 designation follows standard AN/MS sizing, making it a drop-in fit wherever a 372-series O-ring is called out on a drawing or service document. Typical installation environments include commercial HVAC equipment, fluid power systems, plumbing manifolds, and industrial machinery. It is not intended for use with ozone, strong oxidizing acids, ketones, esters, or halogenated hydrocarbons.

Key Features

• Buna-N (NBR) compound — the most widely used O-ring elastomer for petroleum-product compatibility
• Operating temperature range: -40 degrees F to 250 degrees F
• Hardness rating: 70 Shore A (Hard) for stable compression set performance
• Round cross section, Dash 372 standard sizing for direct OEM replacement
• Meets SAE and MIL-Spec standards
• Sold in a package of 5 to support service call stock or batch maintenance

Compatibility

Compatible with petroleum products, hydraulic oils, fuels, and similar mineral-based fluids. Designed to fit any application calling for a standard Dash 372 O-ring per SAE or MIL-Spec dimensioning. Not FDA approved; not suitable for food-contact applications.

Installation Notes

O-ring installation is performed by qualified HVAC technicians, plumbers, or mechanical maintenance personnel. Always depressurize and de-energize the system and relieve all fluid pressure before disassembling fittings or housings. Lightly lubricate the O-ring with a compatible fluid or O-ring grease before seating to prevent pinching or tearing during assembly. Do not store O-rings in direct sunlight or near motors or other electrical equipment that may generate ozone, as ozone degrades NBR compound over time.