Value Collection ZMSCH70173 O-ring Dash 173 Buna-n 70A

Product Description

The VALUE COLLECTION ZMSCH70173 is a Dash 173 Buna-N (nitrile butadiene rubber) O-ring with a round cross section, designed to seal fluid and gas connections in plumbing, hydraulic, pneumatic, and mechanical systems. It measures 8.5 inches inside diameter and 8.688 inches outside diameter, with a thickness of 0.0937 inches (3/32 inches) and a 70 Shore A hardness rating. Rated for service from -40 degrees F to 250 degrees F, this O-ring delivers excellent resistance to petroleum products, good compression set characteristics, and strong tear and abrasion resistance. Plumbers, pipefitters, and mechanical technicians install this type of seal where a reliable, chemically compatible elastomer is required.

This O-ring is suited for use in residential and commercial applications involving petroleum-based fluids, hydraulic oil, water, and similar media. Its Buna-N compound is the most widely specified O-ring elastomer in trade work, making it a practical choice for pump housings, valve bonnets, pipe flanges, filter housings, and similar large-bore sealing applications. The Dash 173 designation conforms to SAE and MIL-Spec dimensional standards, so it fits wherever those standards are called out in a parts list or maintenance manual.

Key Features

• Buna-N (Nitrile) compound with excellent resistance to petroleum products and hydraulic fluids
• 70 Shore A hardness for firm compression set and durable sealing across a wide range of clamping loads
• Operating temperature range of -40 degrees F to 250 degrees F
• Round cross section, Dash 173 standard dimensions conforming to SAE and MIL-Spec requirements
• Strong tear and abrasion resistance for long service life in dynamic and static sealing applications
• Black color; package quantity of 25 per unit

Compatibility

Compatible with petroleum products and petroleum-based fluids per manufacturer data. Conforms to SAE and MIL-Spec dimensional standards for Dash 173 O-rings. Not FDA approved; not recommended for food-contact or ozone-heavy environments. Avoid storage in direct sunlight or near motors and electrical equipment that may generate ozone.

Installation Notes

Plumbers, pipefitters, and hydraulic technicians should shut down system pressure and drain or depressurize the line before replacing O-rings. Lubricate the O-ring with a compatible fluid or grease before seating to prevent pinching or tearing during assembly. Do not store Buna-N O-rings near ozone-generating equipment such as electric motors, welding equipment, or in direct sunlight, as ozone accelerates elastomer degradation. Follow applicable system manufacturer torque specs and applicable codes such as IPC or SAE service procedures when reassembling the joint.