8400 SERIES BUNA CUP 3/8 X 5/8 X 1/8 W

This u-cup seal is supplied in Buna-N (Nitrile), catalogued under part number NU8404-0037. It delivers pressure-energized single-acting sealing on rods and pistons.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, low compression set under sustained load. Expect good resistance to many alcohols, water, and propane and butane. Verify compatibility before use with ketones or automotive brake fluid.

Maintenance and OEM teams specify it across agricultural equipment, hydraulic and pneumatic systems, and general industrial maintenance.

NU8404-0037 ships individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.