Value Collection ZMSCH90248 O-ring Dash 248 Nbr 90D

Product Description

The VALUE COLLECTION ZMSCH90248 is a Dash 248 Buna-N (Nitrile Butadiene Rubber) O-ring engineered for reliable sealing in demanding fluid-handling applications. It measures 4.75 inches inside diameter, 5 inches outside diameter, and 0.125 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. The operating temperature range runs from -40 degrees F to 250 degrees F, making it suitable for a broad range of service conditions. Licensed plumbers, HVAC technicians, and mechanical contractors routinely specify Buna-N O-rings for petroleum and hydraulic fluid sealing.

This O-ring is well suited for residential and commercial plumbing, HVAC refrigerant-adjacent assemblies, hydraulic systems, and general industrial fluid sealing where petroleum-based media are present. Buna-N is the most widely used O-ring elastomer in the trade and is the standard choice when a system handles petroleum products, oils, fuels, or hydraulic fluids. It is not recommended for exposure to ozone-generating equipment or prolonged direct sunlight. The Dash 248 designation follows standard O-ring sizing per SAE and MIL-Spec references, allowing straightforward cross-referencing during field repair or scheduled maintenance.

Key Features

• Buna-N (Nitrile Butadiene Rubber) construction — excellent resistance to petroleum products and hydraulic fluids
• 90 durometer extra-hard rating for strong compression set and extrusion resistance under pressure
• Operating range of -40 degrees F to 250 degrees F covers most HVAC, plumbing, and industrial service environments
• Standard Dash 248 designation per SAE and MIL-Spec for easy cross-referencing
• Round cross-section profile seats cleanly in standard O-ring grooves without rotation issues
• Sold in a package quantity of 25, suitable for stocking service vans or shop inventory

Compatibility

Designed as a standard Dash 248 O-ring replacement compatible with petroleum-based fluid systems, hydraulic assemblies, and mechanical sealing applications where Buna-N elastomer is specified. Compatible materials include petroleum products as noted in manufacturer specifications.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanic. Always de-pressurize and isolate the system before removing any sealing components. Lightly lubricate the O-ring with a compatible petroleum-based or system-appropriate fluid before seating to prevent tearing during assembly. Do not store unused O-rings near motors, ozone-generating equipment, or in direct sunlight, as ozone and UV exposure degrade Buna-N material over time.