Value Collection ZMSCH90238 O-ring Dash 238 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90238 is a Dash 238 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in fluid sealing applications. It measures 3.5 inches inside diameter, 3.75 inches outside diameter, and 0.125 inches thick with a round cross section. Rated at 90 durometer (extra hard), it delivers excellent resistance to petroleum-based fluids, strong compression set recovery, and solid tear and abrasion resistance. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for a broad range of industrial, hydraulic, and pneumatic sealing duties. Licensed plumbers, hydraulic technicians, and maintenance mechanics routinely specify Buna-N O-rings for petroleum-compatible sealing points.

This O-ring is appropriate for static and dynamic sealing applications where contact with petroleum products, oils, fuels, or hydraulic fluids is expected. Common installation environments include hydraulic cylinders, fluid fittings, pump housings, and pneumatic valve bodies in residential, commercial, and light industrial settings. The Dash 238 designation is a standard AS568 size reference used across a wide range of OEM and aftermarket fluid-handling assemblies. Each package contains 50 pieces, making it practical for service shops and maintenance departments that cycle through standard O-ring sizes regularly. This grade is not FDA approved and should not be used in food-contact or potable-water applications without verifying local code compliance.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction with excellent petroleum product resistance
• 90 durometer extra-hard rating for high-pressure sealing environments
• Operating range: -40 degrees F to 250 degrees F
• Round cross section, Dash 238 per AS568 standard sizing
• Meets SAE and MIL-Spec standards
• Pack of 50 pieces for shop and maintenance inventory stocking

Compatibility

Compatible with petroleum products, hydraulic oils, and mineral-based fluids. Designed as an OEM-style replacement or service-stock O-ring wherever a Dash 238 Buna-N seal is specified. Should not be stored in direct sunlight or near motors or electrical equipment that may generate ozone.

Installation Notes

Shut off fluid supply and depressurize the system fully before removing or installing any O-ring. Inspect the groove for burrs, corrosion, or debris before seating the new ring to prevent premature failure. Lightly lubricate the O-ring with a compatible fluid or petroleum-based grease during installation to prevent tearing during assembly. Installation should be performed by a qualified technician following applicable industry standards and equipment manufacturer guidelines.