This o-ring is supplied in AS568-317 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 0.912 in (23.16 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.332 in (33.83 mm), catalogued under part number H70MD317. It remains the most cost-effective sealing element available for pressurized assemblies.
The compound resists petroleum-based oils, greases and lubricants, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with ketones or automotive brake fluid.
This item is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across construction equipment, general industrial maintenance, and fluid power.
Stocked as H70MD317 and sold individually. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description -317 BLACK BUNA 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 0.912 inch (23.16 mm)
Actual Outside Diameter 1.332 inch (33.83 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable