Value Collection ZMSCH70120 O-ring Dash 120 Buna-n 70 Durometer

Product Description

The VALUE COLLECTION ZMSCH70120 is a Dash 120 Nitrile Butadiene Rubber (Buna-N) O-ring with a round cross section, designed for static and dynamic sealing applications across HVAC, plumbing, and general mechanical systems. It measures 1 inch inside diameter, 1.188 inches outside diameter, and 0.0937 inches thick. The 70-durometer hardness rating delivers a hard, resilient seal with excellent compression set resistance, making it reliable under sustained clamping loads. This O-ring resists petroleum-based fluids, oils, and hydraulic media. Licensed tradespeople and maintenance technicians install this type of seal during equipment overhauls, valve rebuilds, and fitting replacements.

This O-ring is suited for residential and light commercial HVAC components, refrigeration fittings, plumbing valves, and hydraulic assemblies where petroleum-product compatibility is required. The Buna-N compound performs across a temperature range of -40 degrees F to 250 degrees F, covering most mechanical and HVAC service environments. It conforms to SAE and MIL-Spec standards, making it appropriate for a wide range of trade and industrial replacement applications. Sold in packages of 100 units, it is well suited for shop stock or service-van inventory.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound — the most widely used O-ring elastomer for petroleum-fluid compatibility
• 70-durometer hardness provides firm sealing under compression without excessive deformation
• Rated from -40 degrees F to 250 degrees F for broad service-temperature coverage
• Round cross-section profile for consistent seating in standard O-ring grooves
• Meets SAE and MIL-Spec standards
• Package quantity of 100 units supports shop-stock and bulk replacement needs

Compatibility

Designed as a standard Dash 120 O-ring replacement compatible with petroleum-based media, including oils, hydraulic fluids, and fuel-system components. Not recommended for use with ozone, direct sunlight exposure, or near motors and electrical equipment that generate ozone. Not FDA approved.

Installation Notes

Installation is typically performed by licensed HVAC technicians, plumbers, or mechanical maintenance personnel. Always relieve system pressure and shut off fluid supply before removing or replacing O-rings. Inspect the seating groove for nicks, corrosion, or debris before installing the new ring. Apply a thin film of compatible lubricant to the O-ring prior to assembly to prevent tearing during installation — avoid petroleum-incompatible lubricants with Buna-N seals. Store unused O-rings away from direct sunlight, ozone sources, and electrical equipment to preserve elastomer integrity.