This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 18.5 mm (0.728 in), a cross section of 1 mm (0.039 in), and an outside diameter of 20.5 mm (0.81 in), catalogued under part number H1X18.5. It provides a reliable static or dynamic seal by deforming into its gland under assembly load.
The compound resists hydraulic fluids, many alcohols, and petroleum-based oils. Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or ketones will shorten service life.
Common environments for this compound include construction equipment, agricultural equipment, and general industrial maintenance.
H1X18.5 ships individually. Unit weight is approximately 0.063 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 1MM CS X 18.5MM ID BLACK BUNA 70D
Actual Outside Diameter 20.5 mm (0.81 inch)
Actual Cross Section 1 mm (0.039 inch)
Actual Inside Diameter 18.5 mm (0.728 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity