Ordered as H2X139.5, this is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 139.5 mm (5.492 in), a cross section of 2 mm (0.079 in), and an outside diameter of 143.5 mm (5.65 in). The o-ring compresses into its gland to block fluid or gas migration across a joint. Additional detail on this item: Metric O-RING, JIS S140.
As a material, Buna-N (Nitrile) is specified for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Expect good resistance to water, greases and lubricants, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in strong acids or polar solvents.
Common environments for this compound include hydraulic and pneumatic systems, fluid power, and automotive.
Order part number H2X139.5, sold individually. Review your operating media and conditions against this specification before installation.
Description 2MM CS X 139.5MM ID BLACK BUNA 70D
Actual Outside Diameter 143.5 mm (5.65 inch)
Actual Cross Section 2 mm (0.079 inch)
Actual Inside Diameter 139.5 mm (5.492 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity