Free Running Inserts

ArmaCoil inserts are manufactured from High Tensile Stainless Steel Wire which has been formed into a diamond section of exacting standards. When installed the ArmaCoil provides a precision female thread of high surface finish & strength.

Installation of the ArmaCoil is achieved by means of the Driving Tang, which is removed after assembly. To permit the removal of the Tang a Notch is cut into the section to provide a shear point. The design of the notch allows for bolt entry from EITHER END of the ArmaCoil.

Insertion of the ArmaCoil is achieved using the appropriate Installation Tool listed in the following pages.

The driving tang is engaged in an abutment or slot in the tool and pre-wound into the nozzle. Placing the tool over the correctly tapped hole, further winding will install the ArmaCoil to the correct depth. After withdrawal of the tool the tang is removed to allow the bolt or screw to pass through the insert.

Once fitted the ArmaCoil will not move. It is secured in position through Radial Pressure exerted by the coils on the thread flanks.

Radial pressure exists due to the outside diam. of the ArmaCoil in its Free State being larger by a calculated amount than the hole into which it is to be installed.