8403 BUNA CUP 5/16 X 1/2 X 3/32 W

The NU8403-0031 is a Buna-N (Nitrile) U-Cup Seal. This u-cup seal uses a U-shaped profile that system pressure forces outward, tightening the seal as pressure rises.

Buna-N (Nitrile) is specified here for low compression set under sustained load and economical choice for high-volume maintenance programs. The compound resists hydraulic fluids, greases and lubricants, and many alcohols.

It sees regular use in automotive, agricultural equipment, and construction equipment.

Order part number NU8403-0031, sold individually. 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.