4MM CS X 142MM ID BLACK BUNA 70D

APG stocks the H4X142, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 142 mm (5.591 in), a cross section of 4 mm (0.157 in), and an outside diameter of 150 mm (5.91 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists hydraulic fluids, water, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Exposure to automotive brake fluid or ozone and direct sunlight will shorten service life.

Maintenance and OEM teams specify it across agricultural equipment, automotive, and general industrial maintenance.

Reference part number H4X142 when ordering; the item is sold individually. Unit weight is approximately 7.039 g. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.