8400 SERIES BUNA CUP 1-3/8X1-11/16X5/32

This u-cup seal is supplied in Buna-N (Nitrile) measuring a 1-3/8 inch inside diameter, a 1-11/16 inch outside diameter, and a height of 5/32 inch, catalogued under part number NU8405-0137. It uses a U-shaped profile that system pressure forces outward, tightening the seal as pressure rises.

This material stands up to petroleum-based oils, hydraulic fluids, and many alcohols. Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Exposure to polar solvents or ketones will shorten service life.

You will find this material specified across automotive, general industrial maintenance, and hydraulic and pneumatic systems.

NU8405-0137 ships individually. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.