-331 WHITE BUNA 70D FDA O-RING

Part number H70FDA331 is an AS568-331 white Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 2.225 in (56.52 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.645 in (67.18 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

It resists many alcohols, hydraulic fluids, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) offers strong abrasion and tear resistance, low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound.

The compound meets FDA requirements for food contact under 21 CFR 177.2600. Common environments for this compound include construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Reference part number H70FDA331 when ordering; the item is sold individually. Unit weight is approximately 5.52 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.