Abstract: A screw threaded insert adapted to be fitted in a bore of a workpiece made of thermoplastic material. The screw threaded insert is externally tapered at an angle of about four (4) degrees and is defined externally with a thread of approximately equal pitch and depth, and of saw toothed shape. The insert is also threaded internally for receiving a bolt. A pair of cutting slots is also provided.

Abstract: A device for installing a threaded bush into a work piece has a housing containing a rotatable threaded rod. A pressure responsive piston in the housing axially moves the threaded rod with respect to the housing. A rotatable abutment sleeve is provided between the housing and the threaded rod. The bush is initially threaded on the rod and then screwed in the workpiece by rotation of the rod until a collar of the bush contacts the surface of the workpiece. Thereafter the rod is axially retracted to cause the abutment sleeve to deform a smooth walled portion of the bush to complete the installation.