Buna 70-157-Black-Pk25

Part number SB-H70157-25 is an AS568-157 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.487 in (113.97 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 4.693 in (119.2 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces. The catalog record notes: 4.6875IDX4.5"ODX.0938"CS.

This material stands up to hydraulic fluids, water, and petroleum-based oils. Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or polar solvents.

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

Order part number SB-H70157-25, sold by the bag. Nominal inside diameter is listed as 4 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.