TOMMARS Metric Thread Chaser Set 15-Piece (M6 M8 M10 M12) — Carbon Steel, Labeled Case

The TOMMARS 15-piece metric thread chaser set is a compact repair kit that cleans, restores and realigns damaged metric bolt threads (M6, M8, M10, M12) for reliable fastener engagement.

This toolkit provides an efficient, non-cutting way to refresh worn or corroded threads on automotive and mechanical parts. Built from durable carbon steel and organized in a labeled storage case, the set lets mechanics and DIYers quickly identify the right chaser and return bolts and studs to dependable service without removing metal material.

What sizes are included and what do they work on?

The set contains metric thread chasers that cover common automotive and machinery fasteners: M12×1.75, M12×1.5, M12×1.25, M10×1.5, M10×1.25, M8×1.25 and M6×1.0, plus a dedicated thread restorer file. These sizes match many wheel studs, suspension bolts, caliper mounts and engine bolts used across passenger vehicles and light machinery.

• M12 family: coarse and fine pitches for main studs and mount bolts
• M10 family: common engine and chassis fasteners
• M8 and M6: smaller bracket and accessory bolts
• Thread restorer file: cleans flanges, shallow damage and surface corrosion

How does the kit repair damaged threads without cutting new material?

Thread chasers realign and clean existing thread profiles rather than shaving or re-threading the hole. The hardened carbon-steel chasers remove debris, rust and minor cross-threading while preserving the original thread dimensions for proper bolt seating.

• Chasing action smooths burrs and resets thread crests
• Non-cutting approach keeps thread pitch intact
• Useful for rusted, dirty, or slightly damaged threads
• Reduce need for time-consuming helicoil or re-tapping when damage is minor

How do I use the tools safely and effectively?

Use a wrench or socket on the hex-shaped chasers and apply steady, controlled turns to avoid forcing the tool. Clean the hole first, apply light lubricant or penetrating oil if corroded, then work the chaser in and out until threads run smoothly. Always test with the actual bolt to confirm fit.

• Clean hole of dirt and loose corrosion before chasing
• Use light cutting compound or oil for smoother action
• Turn gently; back off frequently to clear chips
• Verify with the original bolt after chasing

What should I avoid and when is a different repair needed?

The set is designed for cleaning and restoring existing threads, not for cutting new threads or repairing heavily stripped holes. Avoid using these chasers on spark plug threads or severely torn threads; larger repairs may require re-tapping, inserts (like helicoils), or professional machine work.

• Not suitable for spark plug holes
• Not a replacement for re-tapping stripped through holes
• Use thread inserts if the hole is severely damaged
• Consider professional repair for critical structural threads

Who is this for: The TOMMARS 15-piece metric thread chaser set is made for mechanics, automotive hobbyists and maintenance technicians who need a portable, labeled kit to restore common metric threads quickly. It fits garages, service vans and toolboxes where routine fastener maintenance, rust removal and thread cleaning save time and prevent unnecessary part replacement.