Value Collection ZMSCH70313 O-ring Dash 313 Buna-n 50 Pack

Product Description

The VALUE COLLECTION ZMSCH70313 is a Dash 313 O-ring made from Buna-N (Nitrile Butadiene Rubber), the most widely used elastomer in fluid sealing applications. It measures 0.688 inches inside diameter, 1.063 inches outside diameter, and 0.1875 inches thick with a round cross section. Rated at 70 Shore A hardness, this O-ring delivers strong resistance to petroleum-based fluids, good compression set performance, and solid tear and abrasion resistance. It suits a working temperature range of -40 degrees F to 250 degrees F. HVAC technicians, plumbers, and equipment service pros use this size across a wide range of valve, fitting, and component seal applications.

Buna-N O-rings in the Dash 313 size are commonly found in residential and commercial HVAC systems, refrigeration equipment, plumbing assemblies, hydraulic fittings, and general industrial fluid-handling components. The 50-piece pack is well suited for service contractors who frequently replace seals during preventive maintenance or equipment repair calls. Compatible with petroleum-based fluids and lubricants. Not recommended for ozone-rich environments or direct sunlight storage. Not FDA approved.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction — the most widely used O-ring elastomer for petroleum fluid compatibility
• 70 Shore A hardness rating — classified as hard, resists extrusion under pressure
• Excellent compression set and tear and abrasion resistance for long service life
• Wide temperature range: -40 degrees F to 250 degrees F
• Meets SAE and MIL-Spec standards
• 50-piece package quantity — efficient for repeat-use service scenarios

Compatibility

Compatible with petroleum products. Suitable as a replacement or service seal in applications requiring a Dash 313 Buna-N O-ring per SAE and MIL-Spec standards. Do not use with ozone-generating equipment or in direct sunlight storage conditions.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or qualified equipment service professionals. Always de-pressurize and isolate the system before removing or installing O-rings. Lightly lubricate the O-ring with a compatible fluid or grease prior to seating to prevent pinching or tearing during assembly. Do not store unused O-rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure degrade Nitrile rubber.