Bonded Sealing Washer M8 19x8x3.6 mm Carbon Steel Nitrile Rubber Gasket 50pcs Nitrile rubber is bonded to the outer ring by heat and pressure and held in place. This construction improves burst resistance and increases the pressure rating of the seal. Material: Zinc Plated Carbon Steel; Nitrile Butadiene Rubber: Hardness: 60A; Operating Temperature Range: -20°C ~ 100°C (-4°F ~ 212°F) Fit Size: M8; Outer Diameter: 19 mm; Inner Diameter: 8 mm; Thickness: 3.6 mm The bonded washer itself functions to hold the gasket material, so there is no need to shape the parts to be sealed to hold the gasket. This simplifies machining and makes it easier to use compared to other seals such as O-rings. Self-centering bonded washers are high-pressure seals used in machinery, hydraulic, and pneumatic pipelines. 40-22