-255 BLACK BUNA 70D O-RING

This o-ring is supplied in AS568-255 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 5.609 in (142.47 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.887 in (149.53 mm), catalogued under part number H70255. It creates a positive seal at flange, piston and rod interfaces without added hardware.

Expect good resistance to hydraulic fluids, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) offers strong abrasion and tear resistance, low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or ozone and direct sunlight call for a different compound.

Common environments for this compound include fluid power, construction equipment, and agricultural equipment.

Stocked as H70255 and sold individually. Unit weight is approximately 5.512 g and nominal inside diameter is listed as 5 5/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.