APG stocks the H70MD178, an AS568-178 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.
The compound resists hydraulic fluids, water, and many alcohols. Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ketones call for a different compound.
This o-ring is metal detectable for HACCP and foreign-body control programs. You will find this material specified across fluid power, construction equipment, and general industrial maintenance.
H70MD178 ships individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description -178 BLACK BUNA 70D O-RING
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 9.737 inch (247.32 mm)
Actual Outside Diameter 9.943 inch (252.55 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable