Ordered as H70355, this is an AS568-355 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.645 in (143.38 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
It resists greases and lubricants, propane and butane, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving automotive brake fluid or ozone and direct sunlight call for a different compound.
You will find this material specified across agricultural equipment, construction equipment, and automotive.
Stocked as H70355 and sold individually. Unit weight is approximately 11.908 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description -355 BLACK BUNA 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 5.225 inch (132.72 mm)
Actual Outside Diameter 5.645 inch (143.38 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity