Value Collection ZMSCH90158 O-ring 4.75 in Id Nbr Dash 158

Product Description

The VALUE COLLECTION ZMSCH90158 is a Dash 158 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in sealing applications. It measures 4.75 inches inside diameter, 4.938 inches outside diameter, and 0.094 inches thick with a round cross section. Rated at 90 durometer (extra hard), this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. It is sold in a package of 25 units. Plumbers, HVAC technicians, and industrial maintenance professionals install this part wherever a reliable petroleum-compatible seal is required.

This O-ring is suited for residential and commercial applications involving petroleum-based fluids and oils. The Buna-N compound performs across a wide temperature range of -40 to 250 degrees F, making it appropriate for hydraulic systems, fuel lines, pneumatic fittings, and general-purpose fluid sealing in mechanical and HVAC equipment. It conforms to SAE and MIL-Spec standards, giving technicians confidence in consistent dimensional and material quality across production lots.

Key Features

• Buna-N (Nitrile Butadiene Rubber) material with excellent resistance to petroleum products
• 90 durometer extra-hard rating for high-compression sealing applications
• Operating temperature range: -40 to 250 degrees F
• Round cross section, Dash 158 designation for standard groove compatibility
• Meets SAE and MIL-Spec standards
• Sold in a package of 25 for job-lot efficiency

Compatibility

Compatible with petroleum products and petroleum-based fluids. Designed as a standard Dash 158 O-ring replacement for any application requiring a 4.75-inch ID Buna-N seal. Note: Buna-N is not compatible with ozone, direct sunlight exposure, or equipment that generates ozone such as motors and certain electrical devices.

Installation Notes

O-ring installation should be performed by a qualified plumber, HVAC technician, or mechanical maintenance professional. Always de-pressurize and lock out the system before removing the existing seal. Lightly lubricate the O-ring with a compatible lubricant prior to seating to prevent nicking or tearing during installation. Do not overstretch or twist the O-ring when placing it into the groove.