H70FDA250 is an AS568-250 white Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 4.984 in (126.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.262 in (133.65 mm). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies.
Buna-N (Nitrile) is specified here for low compression set under sustained load and economical choice for high-volume maintenance programs. It resists hydraulic fluids, greases and lubricants, and propane and butane. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or strong acids call for a different compound.
This o-ring meets FDA requirements for food contact under 21 CFR 177.2600. You will find this material specified across hydraulic and pneumatic systems, automotive, and construction equipment.
Order part number H70FDA250, sold individually. Nominal inside diameter is listed as 5 inch. Review your operating media and conditions against this specification before installation.
Description -250 WHITE BUNA 70D FDA O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 4.984 inch (126.59 mm)
Actual Outside Diameter 5.262 inch (133.65 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable