# Tanged Wire Inserts · Installation and selection notes

The tang transfers torque to drive the insert into the installation hole. Plan both tang break-off and recovery as separate process steps.

## Installation steps

1. **Drill the through-hole**：Select the drilling diameter for the thread and parent material, then drill through the workpiece. Check rear clearance and remove chips and burrs at both ends. Steps 01–07 use a through-hole example.

2. **Prepare the entry**：Chamfer and deburr the entry as specified, then inspect the through-hole exit to keep both installation and tang-recovery paths clear. 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 tang**：Use the matching tool to drive the tang and install to the specified depth. Avoid cross-threading, excessive compression and premature tang breakage. Set the depth according to the drawing, entry geometry and tool depth stop.

6. **Break off, recover and inspect**：Ensure sufficient downward travel for the break-off tool. Break the tang as instructed, recover it through the hole exit and verify recovery. Through-holes provide space for tool travel and tang removal; confirm rear access is available.

7. **Complete the inspection**：Inspect depth, insert condition and both ends of the through-hole. Confirm no tang or chips remain and record tang recovery. Complete fit or locking checks as specified. 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

- Repair clearance：Remaining wall thickness, edge distance and the extent of thread damage.
- Insert length：Effective engagement length and safe bottom clearance.
- Tang recovery：Blind holes and enclosed cavities need a practical inspection method.
- Tool combination：STI taps, installation tools and tang break-off tools.