Part number H3X31.5 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 31.5 mm (1.24 in), a cross section of 3 mm (0.118 in), and an outside diameter of 37.5 mm (1.48 in). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
The compound resists propane and butane, water, and hydraulic fluids. Buna-N (Nitrile) is specified for strong abrasion and tear resistance, reliable performance in both static and dynamic service. 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 automotive brake fluid or strong acids.
Maintenance and OEM teams specify it across construction equipment, general industrial maintenance, and agricultural equipment.
Order part number H3X31.5, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 3MM CS X 31.5MM ID BLACK BUNA 70D
Actual Outside Diameter 37.5 mm (1.48 inch)
Actual Cross Section 3 mm (0.118 inch)
Actual Inside Diameter 31.5 mm (1.24 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity