AKM 338pc Thread Repair Kit — HSS Helicoil Insert Set, SAE & Metric (1/4"–1/2", M5–M12) with Taps, Drills & Gauge

The AKM 338Pc Thread Repair Kit is a complete HSS Helicoil-style set that replaces stripped or damaged internal threads in both SAE and metric sizes, supplying taps, drills, inserts and installation tools to restore stronger threads in engines and machinery.

If a bolt hole has become chewed, cross-threaded, or too worn to hold torque safely, this AKM kit brings the parts and tooling needed to repair it on the spot. The set contains 338 pieces—covering common imperial and metric thread sizes—packed in a molded carrying case so you can identify and access the right insert, tap, drill, or installation tool quickly. Everything is sized for automotive and mechanical repair jobs where reliability matters.

What sizes and thread standards does the kit cover?

This kit includes both SAE and metric items to cover a broad range of fasteners used in engines, machinery and domestic equipment. Sizes are selected to match typical bolt diameters so you can repair everything from small machine screws to larger studs.

• Imperial: 1/4", 5/16", 3/8", 7/16", 1/2" inserts and matching taps/drills
• Metric: M5, M6, M8, M10, M12 insert sets with corresponding tools
• Includes HSS drills and taps for each size and multiple wire thread inserts per size
• Thread gauge included to verify existing thread pitch and avoid mismatches

How do I use the AKM repair kit to restore a stripped thread?

Repairing a damaged internal thread follows a simple sequence: drill to the specified size, tap the new thread, insert the coil and break off the tang. The kit supplies instructions and the proper installation tools so a competent DIYer or technician can complete the repair cleanly.

• Drill with the included HSS bit to remove the damaged thread material
• Tapping the new internal thread using the corresponding tap from the set
• Wind in the wire thread insert with the installation tool and break off the tang
• Use the thread gauge to confirm pitch and ensure correct insert selection

What materials and applications is this kit best for?

The AKM inserts form strong internal threads in softer base materials where original threads have failed—commonly aluminum engine blocks, castings and soft alloys. It’s built for automotive repair, light industrial maintenance, and home workshop tasks where thread strength must be restored.

• Designed to reinforce threads in aluminum, magnesium, brass and soft steels
• Suitable for cylinder heads, engine blocks, manifolds and gearbox housings
• Also useful for repairing mounting holes in equipment and household appliances
• Includes installation tools to achieve consistent, repeatable results

Who is this for: The AKM 338Pc Thread Repair Kit is aimed at mechanics, hobbyists and maintenance technicians who encounter stripped or damaged threads and want a single, organized solution. It is ideal for garages, service shops, restoration projects and well-equipped home workshops needing both imperial and metric repair capability without buying multiple single-size kits.