Value Collection ZMSCH70356 O-ring Dash 356 Nbr 5.375 in Id

Product Description

The VALUE COLLECTION ZMSCH70356 is a Dash 356 O-ring manufactured from Nitrile Butadiene Rubber (NBR, also known as Buna-N) with a round cross section. It measures 5.375 inches inside diameter, 5.75 inches outside diameter, and 0.1875 inches thick. Rated at 70 durometer hardness, this O-ring delivers reliable sealing performance across a wide service temperature range of -40 degrees F to 250 degrees F. It resists petroleum-based fluids and offers strong compression set, tear, and abrasion resistance. Licensed HVAC technicians, plumbers, and mechanical technicians reach for Buna-N O-rings when sealing hydraulic, pneumatic, and fluid systems where petroleum product exposure is expected.

This O-ring is suited for use in residential and light commercial applications involving hydraulic systems, plumbing assemblies, pump housings, compressor fittings, and valve bodies where a Dash 356 size seal is required. Its petroleum-product compatibility makes it a common choice for fuel, oil, and hydraulic fluid circuits. The pack ships in a quantity of 5 units, making it practical for service technicians stocking common seal sizes. Store away from direct sunlight and sources of ozone such as electric motors to maintain elastomer integrity.

Key Features

• Buna-N (NBR) elastomer — the most widely used O-ring material for petroleum-product sealing
• Dash 356 standard sizing: 5.375 inches ID, 5.75 inches OD, 0.1875 inches thick
• 70 durometer hardness rating — classified as hard, suitable for higher-pressure sealing applications
• Operating temperature range: -40 degrees F to 250 degrees F
• Round cross section for consistent groove fit and uniform compression
• Meets SAE and MIL-Spec standards
• Pack quantity of 5 per order

Compatibility

Compatible with petroleum products including hydraulic fluids, oils, and fuels. Conforms to SAE and MIL-Spec standards for Dash 356 O-ring dimensions. Not FDA approved; not intended for food-contact or potable-water applications without independent verification of suitability.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or hydraulic system mechanics. Shut down the system and relieve all pressure before removing the old O-ring or seating the replacement. Lightly lubricate the O-ring with a compatible fluid or grease before installation to prevent tearing during seating. Do not install near active ozone sources or store in direct sunlight, as ozone and UV exposure degrade NBR elastomers over time.