The H3.5X37 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 37 mm (1.457 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 44 mm (1.73 in). This o-ring compresses into its gland to block fluid or gas migration across a joint.
Buna-N (Nitrile) is specified here for low compression set under sustained load, reliable performance in both static and dynamic service. The compound resists petroleum-based oils, many alcohols, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or strong acids.
It sees regular use in fluid power, agricultural equipment, and automotive.
Order part number H3.5X37, sold individually. Unit weight is approximately 1.531 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.
Description 3.5MM CS X 37MM ID BLACK BUNA 70D
Actual Outside Diameter 44 mm (1.73 inch)
Actual Cross Section 3.5 mm (0.138 inch)
Actual Inside Diameter 37 mm (1.457 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity