# Tangless Wire Inserts · Installation and selection notes

An end notch drives the insert into a prepared installation thread, with no tang to break off. Suitable for processes that include tang control in quality planning.

## Installation steps

1. **Drill the pilot hole**：Set drilling diameter and depth for the thread size, parent material and blind-hole allowance. Maintain alignment and remove chips. Confirm the pilot-hole dimensions before machining.

2. **Prepare the entry**：Chamfer or deburr the entry as specified to provide a smooth start for the insert. Do not transfer chamfer angles or diameters between different systems. Chamfer requirements depend on the selected insert system and drawing.

3. **Tap the installation thread**：Use a matching STI tap to produce the installation thread. Cutting or forming must be compatible with the parent material and insert system. A conventional screw tap of the same nominal size is not a substitute.

4. **Clean and gauge**：Clean the hole and use a matching STI gauge to check the installation thread. If coating or treatment follows, reassess its dimensional effects. This checks the installation hole before the insert is fitted.

5. **Install using the drive notch**：Engage the notch with a matching tangless tool, install smoothly to the specified depth, then withdraw the tool as instructed. Set the depth according to the drawing, entry geometry and tool depth stop.

6. **Complete the inspection**：Check position, insert condition and hole cleanliness. Tangless installation has no tang break-off or recovery step, but final inspection is still required. Follow the locking insert's acceptance procedure; do not force a standard GO gauge through a locking coil.

Hole preparation, chamfer, installation depth and acceptance requirements must follow the approved drawings and tool instructions.

## Selection guidance

- Thread size：Confirm metric or inch thread, diameter and pitch.
- Effective length：Determine from engagement length and blind-hole clearance.
- Material and finish：Discuss media, temperature and mating screw.
- Installation tools：Confirm the tool tip matches the tangless drive notch.