This o-ring is supplied in AS568-252 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 5.234 in (132.94 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.512 in (140 mm), catalogued under part number H70252. It creates a positive seal at flange, piston and rod interfaces without added hardware.
It resists hydraulic fluids, propane and butane, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for 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).
Common environments for this compound include fluid power, hydraulic and pneumatic systems, and automotive.
H70252 ships individually. Unit weight is approximately 5.1244 g and nominal inside diameter is listed as 5 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description -252 BLACK BUNA 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.234 inch (132.94 mm)
Actual Outside Diameter 5.512 inch (140 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity