The H70MD252 is an AS568-252 black Buna-N (Nitrile) 70 Shore A O-Ring 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). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.
Buna-N (Nitrile) delivers strong abrasion and tear resistance, low compression set under sustained load. Expect good resistance to petroleum-based oils, propane and butane, and water. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving ozone and direct sunlight or automotive brake fluid call for a different compound.
This o-ring is metal detectable for HACCP and foreign-body control programs. It sees regular use in agricultural equipment, fluid power, and construction equipment.
H70MD252 ships individually. Nominal inside diameter is listed as 5 1/4 inch. Check the compound against your process media, pressure and temperature before committing to a design.
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 - FDA / Metal Detectable