Hutchinson Le Joint Français Rubber : PC851 & washer : Mild Steel Bonded Seals O-Ring, 5.21mm Bore, 8.38mm Outer

The Bi-material ring washer-rubber, bonded seals from "HUTCHINSON Le Joirnt Français" are particularly suitable for sealing under the heads of bolts and screws, for pipe couplings (both high and low pressure). It has the advantage of being removable and reusable, as opposed to other seals. Inside diameter for seals is 5.21 and external diameter is 8.38.

Operational temperature range : -30 °C / 100 °C
Peak temperature 120 °C
Rubber colour is black