Value Collection ZMSCH90450 O-ring Dash 450 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90450 is a Dash 450 Nitrile Butadiene Rubber (NBR) O-ring designed for static and dynamic sealing applications across plumbing, HVAC, and fluid-handling systems. It measures 10.5 inches inside diameter, 11 inches outside diameter, and 0.25 inches thick with a round cross section. The 90 durometer hardness rating places it in the extra-hard category, providing strong resistance to extrusion under pressure. The NBR compound delivers excellent resistance to petroleum products, along with reliable compression set, tear resistance, and abrasion resistance. Licensed tradespeople and maintenance technicians install this part wherever a high-durometer, large-bore seal is required.

This O-ring is suited for use in large-bore flanged connections, pump housings, valve bodies, and other assemblies that contact petroleum-based fluids. The NBR material is the most widely used O-ring elastomer in trade applications and performs reliably in hydraulic systems, fuel handling lines, and general fluid-power equipment. It is not recommended for exposure to ozone sources such as motors or direct sunlight during storage, as these conditions can degrade the elastomer over time. The working temperature range of -40 degrees F to 250 degrees F supports year-round use in both indoor and outdoor mechanical systems.

Key Features

• NBR (Buna-N) compound offers excellent resistance to petroleum products and hydraulic fluids
• 90 durometer extra-hard rating reduces extrusion in high-pressure sealing applications
• Operating range of -40 degrees F to 250 degrees F suits a wide range of service environments
• Round cross section, 0.25 inches thick, conforms to SAE and MIL-Spec standards
• Good compression set and tear and abrasion resistance extend service life in dynamic applications
• Package quantity of 2 supports immediate installation with one spare on hand

Compatibility

Compatible with petroleum products and hydraulic fluids; conforms to SAE and MIL-Spec standards. Designed as an OEM-style replacement or maintenance seal for large-bore assemblies requiring a Dash 450 NBR O-ring.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or fluid-power mechanics. Always depressurize and isolate the system before removing the old seal and installing a replacement O-ring. Inspect the groove and mating surfaces for nicks or corrosion before seating the new ring. Do not store NBR O-rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure can degrade the elastomer prior to installation.