-425 BLACK BUNA 70D O-RING

H70425 is an AS568-425 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.475 in (113.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.025 in (127.64 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, economical choice for high-volume maintenance programs. The material holds up against greases and lubricants, water, and hydraulic fluids. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in polar solvents or strong acids.

Maintenance and OEM teams specify it across agricultural equipment, fluid power, and general industrial maintenance.

Order part number H70425, sold individually. Unit weight is approximately 17.95 g and nominal inside diameter is listed as 4 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.