3.5MM CS X 129MM ID BLACK BUNA 70D

Part number H3.5X129 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 129 mm (5.079 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 136 mm (5.35 in). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

It resists hydraulic fluids, water, and propane and butane. Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with strong acids or automotive brake fluid.

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

Reference part number H3.5X129 when ordering; the item is sold individually. Unit weight is approximately 5.212 g. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.