4MM CS X 170MM ID BLACK BUNA 70D

APG stocks the H4X170, a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 170 mm (6.693 in), a cross section of 4 mm (0.157 in), and an outside diameter of 178 mm (7.01 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

It resists many alcohols, hydraulic fluids, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) delivers 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). It should not be specified for service in polar solvents or ozone and direct sunlight.

You will find this material specified across automotive, construction equipment, and general industrial maintenance.

This item is sold individually under part number H4X170. Unit weight is approximately 8.356 g. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.