3.53MM CS X 39.69MM ID BLACK BUNA 70D

Ordered as H3.53X39.69, this is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 39.69 mm (1.563 in), a cross section of 3.53 mm (0.139 in), and an outside diameter of 46.75 mm (1.84 in). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

As a material, Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. This material stands up to petroleum-based oils, propane and butane, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across fluid power, construction equipment, and general industrial maintenance.

H3.53X39.69 ships individually. 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.