4MM (.157) BUNA-N O RING CORD 90 DURO

This o-ring cord stock is supplied in black Buna-N (Nitrile) 90 Shore A supplied with a cross section of 0.157 in (4 mm), catalogued under part number 0M284BH4. It lets you fabricate a custom-size seal on site by cutting and splicing to the required circumference.

It resists petroleum-based oils, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. Exposure to ketones or automotive brake fluid will shorten service life.

You will find this material specified across fluid power, agricultural equipment, and automotive.

Order part number 0M284BH4, sold by the foot. Application requirements vary, so validate compatibility with your process conditions prior to installation.