Buna 70-337-Black-Pk50

Part number SB-H70337-50 is an AS568-337 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 2.975 in (75.57 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.395 in (86.23 mm). An o-ring delivers dependable bidirectional sealing in a compact groove envelope. This item is further identified as 3.375IDX3"ODX.1875"CS.

The material holds up against many alcohols, hydraulic fluids, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where automotive brake fluid or strong acids are present.

Common environments for this compound include hydraulic and pneumatic systems, agricultural equipment, and construction equipment.

Reference part number SB-H70337-50 when ordering; the item is sold by the bag. Application requirements vary, so validate compatibility with your process conditions prior to 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.