Rubber Filled  ( Data Sheet DS 840 )

This is a mechanically operated, shim type nut. It is activated by tightening socket head cap screws located in the top of the nut. The nut has a flanged piston. A shim gap is created between the body and the piston when the nut is operated. The size of the shim gap is a combination of the compression of the bolted joint and gasket, if fitted, plus the elongation of the bolt.

In use the socket head cap screws are tightened until the shim gap is large enough to accept the pre machined shims. The socket head cap screws are then removed and the pre load is transferred onto the shims. A very high percentage of the load is retained in the bolt. The mechanical operating system is unloaded during service.