131-Piece Metric Thread Repair Kit | M5 M6 M8 M10 M12 | 110 Thread Inserts | HSS Drills, Taps & Tang Tools | Stronger Than Original | Steel Case | Auto, Motorcycle & DIY

Rescue Stripped Threads, Save the Part — 131-Piece Metric Thread Repair Kit

Restore damaged or stripped internal threads across five metric sizes — M5, M6, M8, M10 and M12 — with this comprehensive 131-piece thread repair kit. The stainless steel thread inserts create a repaired thread that is harder and more wear-resistant than the original parent material thread, making the repair a genuine long-term fix rather than a temporary patch. Each size in the kit includes the full sequence of tools needed for the repair process: an HSS twist drill to open the damaged hole to the correct diameter, a tap to cut the new thread for the insert, a driver to install the insert, and a tang break-off tool to remove the installation tang once the insert is seated. 110 thread inserts are included across all five sizes. All tools store in a steel carry case with individual compartments. Suitable for automotive engine repair, machine maintenance, 4S shop and professional workshop use, and DIY thread restoration. Weight: 2.25 kg.

Why You'll Love It

• Covers M5, M6, M8, M10 and M12 — the five most common metric thread sizes — The five-size coverage spans the metric thread range used most frequently across automotive engine components, cylinder heads, gearbox casings, brake callipers, suspension components and general machine fasteners — making a single kit sufficient for the majority of stripped thread repairs encountered in a general automotive workshop or busy DIY garage without needing to purchase individual size kits for each repair.
• 110 thread inserts included across all five sizes for multiple repairs — 25 inserts each for M5, M6, M8 and M10, plus 10 for M12, provide enough stock for multiple repairs per size from a single kit purchase — particularly valuable on M8 and M10 repairs which are the most frequently stripped sizes in cylinder head and manifold applications where thermal cycling gradually degrades the thread engagement in aluminium castings.
• Complete tooling sequence per size — drill, tap, driver and tang tool — Including the full set of tools for each size in one kit eliminates the need to source drills, taps and installation tooling separately — a common frustration with budget thread insert packs that include only the inserts and require the user to already own or purchase compatible drill and tap sizes, which often results in incorrect sizing and failed repairs when the hole is not opened to the precise oversize diameter required.
• Thread inserts create a stronger repair than the original thread — The stainless steel wire coil insert bonds with the parent material during installation and distributes fastener load across a greater thread depth than the original stripped thread, producing a repaired connection that withstands the same or greater clamping force than the original undamaged thread — making it appropriate for high-load applications including cylinder head bolts, exhaust manifold studs and suspension fasteners where thread integrity is safety-critical.
• HSS twist drills for accurate hole preparation in steel and aluminium — High-speed steel twist drills maintain cutting accuracy through the precise oversize diameter required for thread insert installation in both steel and aluminium parent materials — critical because drilling to an incorrect diameter prevents the tap from cutting the correct thread form and results in either an undersized hole that prevents insert installation or an oversized hole that provides insufficient grip for the installed insert.
• Steel carry case for organised workshop storage — The steel case with individual compartments keeps all 131 components sorted by size and immediately accessible during a repair, eliminating the time wasted searching through loose components and reducing the risk of using an incorrectly sized insert or tool that requires the repair to be restarted.

Thread Insert Dimensions

M5×0.8 — 6.7mm length | M6×1.0 — 8.0mm length | M8×1.25 — 10.8mm length | M10×1.5 — 13.5mm length | M12×1.75 — 16.3mm length

Specification

Total Pieces: 131 | Thread Sizes: M5×0.8, M6×1.0, M8×1.25, M10×1.5, M12×1.75 | Thread Inserts: 110 (25×M5, 25×M6, 25×M8, 25×M10, 10×M12) | Tools Per Size: HSS twist drill, tap, driver, tang break-off tool | Material: Carbon steel (tools), stainless steel (inserts) | Storage: Steel carry case | Weight: 2.25 kg | Item Ref: 7b0fcfcc-374c-498c-babf-55fc7c5d1b89

Package Includes

25 x M5×0.8 Thread Inserts | 25 x M6×1.0 Thread Inserts | 25 x M8×1.25 Thread Inserts | 25 x M10×1.5 Thread Inserts | 10 x M12×1.75 Thread Inserts | HSS Twist Drills, Taps, Drivers & Tang Break-Off Tools (per size) | 1 x Steel Carry Case