Ordered as H70MD374, this is an AS568-374 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 9.225 in (234.32 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.645 in (244.98 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.
The compound resists hydraulic fluids, propane and butane, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where ozone and direct sunlight or strong acids are present.
The compound is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across agricultural equipment, construction equipment, and fluid power.
H70MD374 ships individually. Review your operating media and conditions against this specification before installation.
Description -374 BLACK BUNA 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 9.225 inch (234.32 mm)
Actual Outside Diameter 9.645 inch (244.98 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable