The H50128 is an AS568-128 black Buna-N (Nitrile) 50 Shore A O-Ring supplied with an inside diameter of 1.487 in (37.77 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.693 in (43 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
It resists many alcohols, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).
It sees regular use in fluid power, agricultural equipment, and general industrial maintenance.
Stocked as H50128 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description -128 BLACK BUNA 50D O-RING
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.487 inch (37.77 mm)
Actual Outside Diameter 1.693 inch (43 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity