-203 BLACK BUNA 70D O-RING

Ordered as H70MD203, this is an AS568-203 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 0.296 in (7.52 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.574 in (14.58 mm). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

This material stands up to petroleum-based oils, many alcohols, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or polar solvents are present.

The compound is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across agricultural equipment, construction equipment, and fluid power.

Order part number H70MD203, sold individually. Nominal inside diameter is listed as 5/16 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.