Ordered as H90M1.78X9.75, this is a black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 9.75 mm (0.384 in), a cross section of 1.78 mm (0.07 in), and an outside diameter of 13.31 mm (0.52 in). The o-ring compresses into its gland to block fluid or gas migration across a joint.
The material holds up against propane and butane, hydraulic fluids, and many alcohols. Buna-N (Nitrile) is specified for low compression set under sustained load, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in ketones or automotive brake fluid.
Common environments for this compound include automotive, fluid power, and agricultural equipment.
Reference part number H90M1.78X9.75 when ordering; the item is sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 1.78MM CS X 9.75MM ID BLACK BUNA 90D
Actual Outside Diameter 13.31 mm (0.52 inch)
Actual Cross Section 1.78 mm (0.07 inch)
Actual Inside Diameter 9.75 mm (0.384 inch)
Measurement System Metric
Product Category O-Rings - Metric - Commodity