Buna 70-242-Black-Pk25

Part number SB-H70242-25 is an AS568-242 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 3.984 in (101.19 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.262 in (108.25 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. Supplementary detail from the product record: 0.139CSX3.984"IDX4.262"OD.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, low compression set under sustained load. The compound resists propane and butane, hydraulic fluids, and petroleum-based oils. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ozone and direct sunlight or automotive brake fluid.

It sees regular use in general industrial maintenance, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number SB-H70242-25 when ordering; the item is sold by the bag. Application requirements vary, so validate compatibility with your process conditions prior to installation.