Value Collection ZMSCHB90335 Nitrile O-ring Dash 8-335

Product Description

The VALUE COLLECTION ZMSCHB90335 is a rectangular cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR), rated at 90 durometer for extra-hard sealing performance. It measures 2.768 inches inside diameter and 3.134 inches outside diameter, with a thickness of 0.0625 inches (1/16 inch). The Dash 8-335 designation identifies this as a standard-dimensioned backup ring used to prevent O-ring extrusion under pressure in hydraulic and pneumatic assemblies. It is installed by plumbers, millwrights, and fluid-system technicians working on high-pressure sealing applications requiring dimensional consistency and chemical compatibility with petroleum-based fluids.

This backup ring is suited for use in hydraulic cylinders, pneumatic actuators, valve assemblies, and fluid transfer systems where standard O-rings require lateral support against extrusion. The 90 durometer hardness and NBR compound make it a strong candidate for systems handling petroleum oils, fuels, and general-purpose hydraulic fluids. The working temperature range of -40 degrees F to 250 degrees F covers most industrial and commercial equipment environments. Each package contains 10 rings, with a minimum order quantity of 1.

Key Features

• Rectangular cross-section profile functions as a backup ring to prevent O-ring extrusion under pressure
• 90 durometer extra-hard NBR compound resists deformation under sustained load
• 2.768 inches ID and 3.134 inches OD conforming to Dash 8-335 standard dimensions
• 0.0625 inch thickness for precise groove fit in standard backup-ring grooves
• Rated for -40 degrees F to 250 degrees F continuous working temperature range
• Sold in packages of 10 with a minimum order quantity of 1

Compatibility

Designed as a standard Dash 8-335 backup O-ring for hydraulic and pneumatic sealing assemblies requiring a rectangular NBR ring with a 2.768 inch inside diameter. Confirm groove dimensions and system fluid compatibility before installation.

Installation Notes

Installation should be performed by a qualified technician familiar with hydraulic or pneumatic sealing systems. De-energize and fully depressurize the system before disassembling any sealing components. Avoid stretching or kinking the backup ring during installation; use a blunt-tipped installation tool if needed to seat the ring in the groove without nicking. Confirm the ring is not FDA-rated before use in food-contact or potable-water applications, as this part is not FDA approved.