Usit-Rings are commonly referred to as screw gasket seals or flange connection seals. They consist of a flat, metallic disc and a rubber bulge on the inside or outside. The metallic disc is available in both steel and stainless steel, the rubber seal can be delivered in either NBR or even Viton.

Our range of dimensions offers both metric as well as inch sizes.

Catalogue End-Caps
and Usit-Rings
Data Sheet Usit-Rings

Material choice at a glance


Raw materialDesignationTemperature range
Nitrile butadiene rubberNBR 70-30°c+100°C
Fluoric rubberFPM 70-20°c+180°C
Ethylen-Propylen-Dien-RubberEPDM 70-40°c+150°C
SteelAISI 1020
Stainless steelAISI 304 / ASI 316