*FAB PISTON CUP 3 OD X 5/8 X 5/32

Ordered as K300, this is a Buna-N (Nitrile) U-Cup Seal built to a 5/8 in inside diameter, a 3 in outside diameter, and a height of 5/32 in. The u-cup seal seals more effectively as system pressure increases, without added squeeze at rest.

The compound resists hydraulic fluids, propane and butane, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Verify compatibility before use with ketones or ozone and direct sunlight.

Common environments for this compound include general industrial maintenance, fluid power, and construction equipment.

Reference part number K300 when ordering; the item is sold individually. 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.