Value Collection ZMSCH70MD335 O-ring Dash 335 Nbr 70A

Product Description

The VALUE COLLECTION ZMSCH70MD335 is a Dash 335 nitrile butadiene rubber (NBR) O-ring with a 2.725-inch inside diameter, a 3.125-inch outside diameter, and a 0.1875-inch (3/16 inch) round cross section. Rated at 70 Shore A hardness, this O-ring is engineered for static and dynamic sealing applications where petroleum-based fluids are present. NBR is the most widely used elastomer in fluid sealing, chosen for its excellent resistance to petroleum products, strong compression set resistance, and good tear and abrasion resistance. Licensed plumbers, HVAC technicians, and mechanical contractors use this profile in a wide range of sealing assemblies.

This O-ring is suited for residential and commercial plumbing, HVAC refrigerant or oil circuits, hydraulic assemblies, and general mechanical systems where petroleum-based fluids or lubricants are the primary media. The Dash 335 dimension is a standard AS568 size, making it a common replacement seal in pump housings, valve bodies, pipe unions, and fitting assemblies. It is sold in a package of 2. This part is not FDA approved and should not be used in food-contact applications.

Key Features

• NBR construction provides excellent resistance to petroleum-based fluids and lubricants
• 70 Shore A hardness rating offers a firm seal with reliable compression set performance
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross section ensures consistent groove seating and even radial compression
• Black color; metal-detectable NBR compound noted in additional product information
• Should not be stored in direct sunlight or near ozone-generating equipment such as motors

Compatibility

Designed as a standard Dash 335 AS568-profile O-ring compatible with petroleum-based fluid systems including hydraulic circuits, pump housings, valve bodies, and mechanical pipe fittings requiring an NBR sealing element.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanical contractor. Shut off and depressurize the system completely before removing the old seal or fitting the replacement O-ring. Lightly lubricate the O-ring with a compatible petroleum-based or NBR-safe lubricant before seating to prevent pinching or tearing during assembly. Inspect the groove or bore for burrs, scoring, or corrosion before installing the new seal.