Value Collection ZMSCH90348 O-ring Dash 348 Nbr 90 Duro

Product Description

The VALUE COLLECTION ZMSCH90348 is a Dash 348 O-ring manufactured from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 4.375 inches inside diameter, 4.750 inches outside diameter, and 0.1875 inches thick, with a round cross-section profile. Rated at 90 durometer (extra hard), this O-ring delivers excellent compression set resistance along with strong tear and abrasion resistance. It is installed by licensed plumbers, HVAC technicians, and maintenance mechanics in systems where reliable sealing against petroleum-based fluids is required.

This O-ring is suited for use in hydraulic systems, pneumatic assemblies, fuel handling equipment, and general industrial fluid sealing applications where exposure to petroleum products is expected. Its Buna-N compound provides dependable performance across a broad temperature range, making it appropriate for both indoor mechanical systems and outdoor equipment exposed to temperature swings. The package quantity is 10 pieces per order, and the minimum order quantity is 1.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products
• 90 durometer extra hard rating for high-compression sealing applications
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross-section; conforms to SAE and MIL-Spec standards
• Tear and abrasion resistant construction for long service life
• Sold in packs of 10; minimum order quantity of 1 pack

Compatibility

Compatible with petroleum-based fluids and products. Designed as an OEM-style Dash 348 replacement O-ring for hydraulic, pneumatic, and fluid system assemblies requiring a 4.375-inch ID Buna-N seal. Not recommended for exposure to ozone, direct sunlight during storage, or proximity to motors or other electrical equipment that may generate ozone.

Installation Notes

O-ring installation is typically performed by licensed plumbers, HVAC technicians, or industrial maintenance mechanics. Before servicing any assembly, depressurize the system completely and isolate all fluid sources. Inspect the mating groove for damage or contamination before seating the new O-ring, and apply a compatible lubricant to reduce installation stress and prevent rolling or twisting. Do not use petroleum-incompatible lubricants or expose the O-ring to ozone-generating equipment during storage or handling.