-355 BLACK BUNA 70D O-RING

The H70MD355 is an AS568-355 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.645 in (143.38 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. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound.

This o-ring is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include agricultural equipment, automotive, and fluid power.

Reference part number H70MD355 when ordering; the item is sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.