Ordered as H70218, this is an AS568-218 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 1.234 in (31.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.512 in (38.4 mm). The o-ring compresses into its gland to block fluid or gas migration across a joint.
As a material, Buna-N (Nitrile) is known for strong abrasion and tear resistance, low compression set under sustained load. It resists water, propane and butane, and greases and lubricants. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or automotive brake fluid.
You will find this material specified across fluid power, agricultural equipment, and automotive.
This item is sold individually under part number H70218. Unit weight is approximately 1.3169 g and nominal inside diameter is listed as 1 1/4 inch. Review your operating media and conditions against this specification before installation.
Description -218 BLACK BUNA 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 1.234 inch (31.34 mm)
Actual Outside Diameter 1.512 inch (38.4 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity