Value Collection ZMSCH90121 Buna-n O-ring Dash 121 50-pack

Product Description

The VALUE COLLECTION ZMSCH90121 is a Dash 121 O-ring made from Nitrile Butadiene Rubber, also known as Buna-N, the most widely used elastomer in sealing applications. It measures 1.63 inches inside diameter with a 0.094-inch cross-section thickness and carries a 90 durometer hardness rating, placing it in the extra-hard category. This O-ring is designed for static and dynamic sealing in hydraulic, pneumatic, and fluid-handling systems. It is sold in a pack of 50. Licensed technicians, machinists, and maintenance professionals working on petroleum-based fluid systems reach for Buna-N rings like this one as a reliable, cost-effective sealing solution.

This O-ring is suited for use in residential and commercial HVAC systems, hydraulic cylinders, pumps, valves, plumbing fittings, and general industrial fluid-handling equipment where exposure to petroleum-based oils and fuels is expected. The operating temperature range of -40 degrees F to 250 degrees F makes it appropriate for a wide range of indoor and outdoor service conditions. The round cross-section profile fits standard Dash 121 O-ring grooves per SAE and MIL-Spec dimensional standards.

Key Features

• Buna-N (NBR) material provides excellent resistance to petroleum products, oils, and fuels
• 90 durometer extra-hard rating resists extrusion under pressure in tight-clearance grooves
• Temperature rated from -40 degrees F to 250 degrees F for broad service range
• Meets SAE and MIL-Spec dimensional standards for Dash 121 cross-section
• Good compression set, tear resistance, and abrasion resistance for dynamic sealing
• Pack of 50 units supports service fleets, shop stock, and bulk repair work

Compatibility

Designed as an OEM-style replacement or service-stock O-ring for any application requiring a Dash 121 round cross-section ring in Buna-N material. Compatible with petroleum-based fluid media. Note: Buna-N should not be stored in direct sunlight or near motors and electrical equipment that may generate ozone, as ozone exposure degrades NBR elastomers.

Installation Notes

O-ring installation is typically performed by HVAC technicians, plumbers, hydraulic system mechanics, or industrial maintenance personnel. Before replacing an O-ring, de-energize the system, relieve all fluid pressure, and drain or isolate the relevant fluid circuit. Lubricate the O-ring with a compatible grease or fluid before seating it to prevent twisting or tearing during assembly. Do not over-stretch the ring during installation, and confirm the groove dimensions match the Dash 121 specification before use.