The H70MD256 is an AS568-256 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 5.734 in (145.64 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.012 in (152.7 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.
This material stands up to propane and butane, greases and lubricants, and water. Buna-N (Nitrile) offers low compression set under sustained load, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.
The compound is metal detectable for HACCP and foreign-body control programs. You will find this material specified across fluid power, general industrial maintenance, and construction equipment.
Order part number H70MD256, sold individually. Nominal inside diameter is listed as 5 3/4 inch. Review your operating media and conditions against this specification before installation.
Description -256 BLACK BUNA 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.734 inch (145.64 mm)
Actual Outside Diameter 6.012 inch (152.7 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable