What types of tools are used for installing key locking inserts?

The tools for installing key-locking threaded inserts can be broadly categorized by function and usage stage as follows:

1. Pre-installation tools
– Drill bit: Used to prepare the pilot hole; its diameter must be larger than the insert’s minor diameter but smaller than the major diameter .
– Tap: Cuts the internal thread. Straight-flute and spiral-flute types are common; the latter improves chip evacuation .
– Thread gauge: Includes plug and ring gauges to verify thread accuracy after tapping—goal is “go-gage goes, no-go gage stops” .

2. Insertion tools
– Installation wrench / mandrel: Drives the insert into the tapped hole. Light-duty, heavy-duty, and “built-in spring” models exist, typically made from SCM435 steel .
– Dedicated insertion tool: Patented designs combine an installation stud with a hammer sleeve to thread the insert and pre-drive the keys in one motion .
– Power / pneumatic tools: For high-volume assembly, electric or pneumatic drivers speed the process .

3. Key-locking tools
– Key-driver / punch: Hammers the insert’s locking keys into the parent material. Some wrenches have an integral punch at the handle end .
– Impact mechanism: Newer tools convert rotary motion into reciprocating strikes, automatically seating the keys evenly without manual hammering .

4. Removal (rework) tools
– Extracting tool: If an insert is mis-installed or must be replaced, this tool backs it out. When keys are already driven, they must first be drilled off or broken away before extraction .

The standard tool kit for key-locking inserts comprises: svrdlo, tap, thread gauge, installation wrench (manual or power), key-driver/punch, and extraction tool—selected according to insert size, production volume, and precision requirements.