TOMMARS Thread File Set — 3-Piece SAE & Metric External Thread Restorer with Protective Caps

TOMMARS 3-piece SAE and Metric thread file set restores damaged external threads on bolts, shafts, studs and pipe ends quickly and precisely.

Whether you’re a mechanic, maintenance tech, or a DIYer, stripped or flattened external threads don’t have to mean replacement. This compact kit contains three hardened carbon-steel thread files cut to match the most common SAE and metric thread pitches, protective snap-on end caps for safer handling, and a slim storage sleeve for organized transport. The files re-cut and clean threads so fasteners run true again without swapping parts.

How do these files repair crushed or rusted threads?

The files have precision-cut teeth shaped to follow external thread profiles. By aligning the file across the damaged section and making controlled passes, you remove corrosion and restore the thread’s crest and flank geometry so nuts and mates can engage smoothly.

• Hardened carbon-steel teeth for durable cutting performance
• Uniform tooth pattern to re-form crest and flanks consistently
• Works on rust, burrs, flattened peaks and light deformation
• Snap-on end caps help steady the tool for fine passes

Which thread sizes are covered in this set?

The set combines the most frequently used SAE and metric external pitches so one kit covers a wide workshop range. You’ll find both coarse and fine pitches that suit common bolts, studs and pipe threads encountered in automotive, plumbing and machinery repairs.

• SAE sizes: 9, 10, 12, 16, 20, 27, 28, 32 and 11, 12, 13, 14, 16, 18, 20, 24
• Metric pitches: 0.75mm, 1.0mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, 3.00mm
• Three files cover both coarse and fine thread series
• Compact sleeve keeps sizes organized and protected

What makes these files comfortable and safe to use?

Each file is delivered with a snap-on protective end cap that shields the cutting edges and gives you a safer, more controlled grip. The caps reduce the chance of accidental nicks while you position or pass the file across tight thread sections.

• Snap-on end caps for hand protection and improved control
• Slim, lightweight files reduce hand fatigue during repetitive passes
• Storage sleeve prevents edge damage and keeps files separated
• Easy to carry in tool carts, glove boxes, or field kits

How should I use the set for best results?

Start by matching the closest file pitch to the damaged thread, then align lightly and make a few gentle forward strokes to re-form the profile. Clean debris often, inspect the mating fastener for wear, and avoid over-cutting by using light, controlled pressure.

• Choose matching pitch and hold the file square to the thread axis
• Use light, even strokes and check progress frequently
• Remove filings and corrosion between passes for consistent results
• Test-fit fastener; repeat minimally until threads run smoothly

Who is this for? The TOMMARS 3-piece thread file set is suited to mechanics, maintenance personnel, machine-shop operators and home mechanics who prefer repairing fasteners over replacing them. It’s especially useful for field service, emergency repairs, vintage equipment maintenance, and any situation where a quick, reliable thread restoration saves time and expense. The compact sleeve and protective caps make it convenient for everyday toolboxes and on-site tool kits, providing a cost-effective way to keep threaded connections functional without changing original parts.