Buna 70-122-Black-Pk20

APG stocks the SB-H70122-20, an AS568-122 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 1.112 in (28.24 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.318 in (33.48 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. The catalog record notes: 1.3125IDX1.125"ODX.0938"CS.

This material stands up to many alcohols, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with strong acids or polar solvents.

Typical settings include general industrial maintenance, hydraulic and pneumatic systems, and fluid power.

Order part number SB-H70122-20, sold by the bag. 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.