3.1MM CS X 39.4MM ID BLACK BUNA 70D

The H3.1X39.4 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 39.4 mm (1.551 in), a cross section of 3.1 mm (0.122 in), and an outside diameter of 45.6 mm (1.8 in). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. The catalog record notes: Metric O-RING, JIS G40.

As a material, Buna-N (Nitrile) is valued for low compression set under sustained load and an economical choice for high-volume maintenance programs. The material holds up against hydraulic fluids, many alcohols, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with automotive brake fluid or strong acids.

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

Reference part number H3.1X39.4 when ordering; the item is sold individually. Unit weight is approximately 1.2201 g. Check the compound against your process media, pressure and temperature before committing to a design.