TOMMARS Thread File Set — 3-Piece SAE & Metric External Thread Repair, Hardened Carbon Steel

TOMMARS 3-piece thread file set restores damaged external threads on bolts, studs, shafts and pipe ends in both SAE and metric sizes.

This compact kit brings three hardened carbon-steel thread files designed for accurate, hand-controlled reshaping and cleaning of crushed, rusted, or flattened threads. Each file has precision-cut teeth and snap-on protective end caps, and the set includes the most commonly needed SAE and metric thread pitches so you can quickly match and repair external threads without replacing fasteners or parts.

Which thread sizes are covered in this set?

The three files together cover a broad selection of SAE and metric pitches to handle most common repair tasks. You’ll find SAE sizes covering small to mid-range threads and metric pitches from fine to coarse, letting you match threads on automotive, plumbing and machinery components.

• SAE: 9, 10, 12, 16, 20, 27, 28, 32 and 11, 12, 13, 14, 16, 18, 20, 24 for a wide selection of U.S. standard pitches.
• Metric: 0.75mm, 1.0mm, 1.25mm, 1.50mm, 1.75mm, 2.00mm, 3.00mm to tackle most metric external threads.
• Three-file arrangement groups compatible sizes for fast selection during repairs.

How do the files work and what makes them durable?

Each file is cut from hardened carbon steel and ground with uniform, sharp teeth sized for external threads. The tooth geometry supports smooth cutting action when you run the file along the thread ridges, removing corrosion or deformation while preserving the thread profile.

• Hardened carbon-steel construction for long life and consistent cutting.
• Precision-cut teeth for controlled material removal without excessive waste.
• Snap-on end caps protect edges when not in use and improve hand comfort when filing.

What are practical uses and how do I use the set safely?

Use the thread files to clean, reshape, and rebuild external threads on bolts, studs, shafts, and pipe ends before replacement. Hold the file so teeth engage the thread crest and stroke steadily along the thread direction; check fit frequently against a nut or mating part to avoid overcutting.

• Ideal for automotive, marine, plumbing and light industrial repairs in the field or shop.
• Use short, controlled strokes and test fit often to preserve thread integrity.
• Keep protective end caps on until ready to use and store files in the provided sleeve to prevent damage.

How is the set stored and transported?

The three files come in a slim storage sleeve that keeps each file separated and protected from impact. The sleeve is compact enough for toolboxes, glove compartments and field kits so you can take the set to on-site repairs without adding bulk.

• Compact storage sleeve organizes and protects the files between uses.
• Slim profile fits in tool carts, glove boxes and repair pouches.
• Quick visual identification of SAE and metric files speeds selection on the job.

Who is this for: Technicians, mechanics, maintenance staff and DIYers who want a low-cost, portable solution for restoring external threads will find this TOMMARS set helpful. It’s designed for people who need reliable thread cleanup and repair on-site or in the workshop, without the expense of replacing bolts, studs or parts. If you frequently work on older equipment, plumbing, engines or fabricated assemblies, the set covers the common SAE and metric pitches you’ll encounter and stores neatly in a toolbox or glove compartment.