KUNGJUER Thread File Set 3-Piece — Metric & SAE Chaser Files, Heat-Treated Carbon Steel with Removable Handle

Keep threaded fasteners functional without replacing them: this compact set contains three multi-groove chaser files that re-cut or clean external threads across a broad range of metric and SAE pitches. Made from heat-treated carbon steel with a black oxide finish, each file is built to resist wear while delivering accurate thread profiles for workshop or field repairs. The removable handle and protective caps improve comfort and safety when working in tight or awkward spots.

Which thread sizes are covered by the set?

The set includes one metric file and two SAE files (UNF and UNC) to match common manufacturing and automotive standards. Each file has multiple grooves so a single tool can address several closely spaced pitches, reducing the number of tools you need to carry.

• Metric grooves: 0.75mm, 1.00mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, 2.50mm, 3.00mm.
• SAE UNF grooves: #9, #10, #12, #16, #20, #27, #28, #32.
• SAE UNC grooves: #11, #12, #13, #14, #16, #18, #20, #24.

How durable and accurate are the KUNGJUER chaser files?

These files are manufactured from carbon steel that has been heat-treated for hardness and dimensional stability, then given a black oxide coating to reduce corrosion and glare. The result is a tool that resists edge deformation so the thread profile stays consistent through repeated use.

• Heat-treated carbon steel core for long-lasting cutting edges.
• Black oxide finish protects surfaces and reduces reflection.
• Multiple grooves milled precisely to retain thread form accuracy.

How do I use the files safely and effectively?

Attach the removable handle for two-handed control, line the file with the damaged thread, and make steady forward strokes while maintaining the original thread angle. Protective end caps cover the sharp file tips when not in use, and the handle reduces hand fatigue during longer repairs.

• Install the handle for better leverage and control.
• Match the groove to the existing thread pitch before filing.
• Use steady, light passes—inspect frequently to avoid over-cutting.
• Replace protective caps after use to prevent injury and bluntness.

What kinds of jobs can these files handle?

The KUNGJUER set is suited to many real-world tasks where replacing a fastener is impractical: reconditioning rusted bolts, cleaning burrs on studs, or tidying threads on pipe fittings. Their size and versatility make them useful for mechanics, maintenance teams, and DIYers alike.

• Automotive and engine maintenance (bolts, studs, wheel hardware).
• Industrial machinery and chassis repair tasks.
• Piping and plumbing fittings with external thread damage.
• Electrical equipment fastening and onsite maintenance work.

Who is this for: The KUNGJUER 3Pcs Thread File Set is ideal for professional mechanics, industrial maintenance crews, and serious hobbyists who need a portable, reliable way to restore external threads without replacing parts. If you regularly deal with damaged bolts, studs or fittings and want a durable, multipitch solution that fits a toolbox, this set provides broad coverage with ergonomic handling and corrosion-resistant construction.