Value Collection ZMSCH70441 O-ring Dash 441 Nitrile Nbr

Product Description

The VALUE COLLECTION ZMSCH70441 is a Dash 441 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in sealing applications. It features a 7 inch inside diameter, a 7.5 inch outside diameter, and a 0.25 inch round cross section with a Shore A hardness rating in the hard range (70 durometer). This O-ring is designed to provide reliable static or dynamic sealing in fluid-handling systems and is installed by plumbers, HVAC technicians, and mechanical contractors working on petroleum-based fluid circuits and general-purpose hydraulic or pneumatic assemblies. The package contains 2 O-rings per unit.

This O-ring is suited for use in residential and commercial plumbing, HVAC, hydraulic, and pneumatic systems where petroleum-product resistance is required. Its Buna-N compound delivers excellent compression set resistance along with strong tear and abrasion resistance. It performs across a broad temperature range of -40 degrees F to 250 degrees F, making it appropriate for both indoor mechanical rooms and outdoor equipment exposed to seasonal temperature swings. It is not intended for use with ozone-generating equipment or in direct sunlight storage conditions.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products
• Round cross section with 0.25 inch thickness and 70 Shore A hardness
• Operating temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• Strong compression set, tear, and abrasion resistance for long service life in sealing applications
• Package quantity of 2 per unit with a minimum order quantity of 1

Compatibility

Compatible with petroleum products and petroleum-based fluids. Designed as a standard Dash 441 O-ring replacement suitable for hydraulic, pneumatic, and fluid-handling systems that specify Buna-N elastomer seals. Not FDA approved for food or potable water contact applications.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or mechanical contractors. Always depressurize and drain the system before replacing O-rings to prevent injury and ensure a proper seat. Lubricate the O-ring with a compatible lubricant rated for use with Buna-N and petroleum-based fluids before installation to reduce the risk of twisting or tearing during assembly. Do not store O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure degrade Nitrile rubber.