WTI Fasteners Databooks
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Pre-wind Plain Mandrel Tool (Body 3)
The pre-wind nozzle is necessary for the installation of screw locking wire thread inserts, where the insert must be compressed (pre-wound) prior to installation in the tapped hole.
Method of use
- Withdraw the mandrel from the main tool body
- with a window style tool the mandrel will only need to be withdrawn to the window
- with a full body tool the mandrel will be withdrawn completely
- Place the insert into the main tool body - either through the window or from the top end of the body as required - with the driving tang facing towards the nozzle
- Return the mandrel into the tool body engaging the driving tang in the slot of the mandrel.
- Move the mandrel with the engaged insert towards the nozzle
- Wind the insert clockwise into the nozzle until it meets the nozzle end
- Place the tool squarely over the tapped hole
- Continue winding until the insert is positioned approximately 1/4-1/2 turn below the surface of the tapped hole
- Withdraw the tool.
Note: Excessive axial pressure can cause inserts to jump thread when transferring from the nozzle to the tapped hole - fine pitch threads are particularly prone to this.
