-250 BLACK BUNA 70D O-RING

The H70250 is an AS568-250 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.984 in (126.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.262 in (133.65 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

This material stands up to water, many alcohols, and greases and lubricants. 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. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or strong acids call for a different compound.

Typical settings include fluid power, agricultural equipment, and automotive.

This item is sold individually under part number H70250. Unit weight is approximately 4.984 g and nominal inside diameter is listed as 5 inch. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.