Ordered as H70MD440, this is an AS568-440 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 6.725 in (170.82 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.275 in (184.79 mm). The o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
Buna-N (Nitrile) is specified here for economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Expect good resistance to petroleum-based oils, water, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).
This o-ring is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include construction equipment, fluid power, and automotive.
This item is sold individually under part number H70MD440. Nominal inside diameter is listed as 6 3/4 inch. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description -440 BLACK BUNA 70D O-RING
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 6.725 inch (170.82 mm)
Actual Outside Diameter 7.275 inch (184.79 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable