Buna 70-427-Black-Pk5

This o-ring is supplied in AS568-427 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 4.725 in (120.02 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.275 in (133.99 mm), catalogued under part number SB-H70427-5. It creates a positive seal at flange, piston and rod interfaces without added hardware. The catalog record notes: 5.25IDX4.75"ODX.25"CS.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, economical choice for high-volume maintenance programs. Expect good resistance to petroleum-based oils, greases and lubricants, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across agricultural equipment, automotive, and hydraulic and pneumatic systems.

Reference part number SB-H70427-5 when ordering; the item is sold by the bag. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.