Part number H70245 is an AS568-245 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 4.359 in (110.72 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.637 in (117.78 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
Buna-N (Nitrile) is specified for low compression set under sustained load, reliable performance in both static and dynamic service. It resists hydraulic fluids, petroleum-based oils, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to ketones or automotive brake fluid will shorten service life.
Maintenance and OEM teams specify it across general industrial maintenance, automotive, and agricultural equipment.
Stocked as H70245 and sold individually. Unit weight is approximately 4.376 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description -245 BLACK BUNA 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 4.359 inch (110.72 mm)
Actual Outside Diameter 4.637 inch (117.78 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity