4640-10 HELICOIL Heli Coil Thread Repair Tap Drill Tool Kit

Review HELICOIL Heli-coil 1.25 Metric Thread Repair Kit Tap Drill Insert Tool for M10 STI

The Helicoil 4640-10 M10 1.25 thread repair kit by STI (Superior Tap & Die) is a comprehensive solution for repairing and restoring stripped or damaged threads in various applications. This particular kit is designed for M10 threads with a pitch of 1.25mm and comes with a tap drill tool (helicoil tap drill, model 4640) for enhanced installation precision.

The kit includes a complete assortment of Helicoil inserts, which are available in various sizes to accommodate different degrees of thread damage. Each insert is meticulously engineered to provide a secure and durable repair, ensuring optimal thread engagement and longevity. The Helicoil inserts are manufactured using high-quality materials, such as SAE 4140 alloy steel, to guarantee superior strength and resistance to corrosion.

The tap drill tool (model 4640) is an essential component of the repair process. It is expertly crafted to ensure precise drilling and thread preparation prior to the installation of the Helicoil inserts. This tool features a robust design with a durable body and a tapered drill bit that guarantees consistent and accurate thread depth, ensuring a successful repair every time.

The Helicoil 4640-10 M10 1.25 thread repair kit is an indispensable addition to any mechanic's or DIY enthusiast's toolbox. Whether you're working on automotive, industrial, or marine applications, this repair kit provides a reliable and efficient solution for restoring damaged threads and extending the service life of components. With its high-quality materials, precise tooling, and comprehensive range of sizes, the Helicoil 4640-10 M10 1.25 thread repair kit is an invaluable asset for anyone seeking to maintain and repair threaded components with confidence and ease.

Helicoil 4640-10 is a heli-coil M10 1.25 thread repair kit with a STI (Self-Tapping Installation) tap drill tool. This kit is designed to repair stripped or damaged threads in various applications. Here are some pros and cons of buying this Helicoil repair kit:

1. Convenient Kit: The Helicoil 4640-10 kit includes both the Helicoil inserts and the STI tap drill tool, making it a one-stop solution for thread repair.

2. Versatile: The M10 1.25 thread size is commonly used in various industries, including automotive, aerospace, and industrial applications.

3. Time-Saving: The STI tap drill tool allows for self-tapping installation, reducing the time and effort required for thread repair.

4. Durable: Helicoil inserts are known for their strength and durability, providing a reliable repair solution.

1. Expensive: Compared to other thread repair options, such as tapping new threads or using alternative thread repair methods, the Helicoil repair kit can be more expensive.

2. Limited Thread Sizes: The Helicoil 4640-10 kit is specific to the M10 1.25 thread size. If you need to repair threads of a different size, you will need to purchase a different kit.

3. Requires Special Tools: To install the Helicoil inserts, you will need access to a drill and the STI tap drill tool included in the kit. If these tools are not readily available, the repair may be more difficult.

In conclusion, the Helicoil 4640-10 heli-coil M10 1.25 thread repair kit with STI tap drill tool is a reliable and convenient solution for repairing stripped or damaged threads in applications that require the M10 1.25 thread size. However, it may be more expensive than other thread repair options and limited to specific thread sizes.

If you frequently encounter thread damage in various thread sizes and have access to the necessary tools, it may be worth the investment for the convenience and durability of the Helicoil repair kit. However, if you only need to repair threads occasionally or require a more cost-effective solution, alternative thread repair methods or purchasing specific thread repair kits for each thread size may be a better option.

Details:

Review photos carefully for exact condition and included components. Tool markings visible including heli-coil 4640-10 and M10 x 1.25 sizing. Includes Sti tap, installation tool, drill bit 13/32, and thread inserts shown in photos. Genuine heli-coil 4640-10 M10 x 1.25 metric thread repair kit.

Includes only items pictured.

specifications threadtoollot:

• for models: M10, Sti
• brand: Helicoil
• mpn: 4640-10
• type: Heli-coil Insert
• system of measurement: Metric

shipping threadtoollot:

• type: fixed
• transit: 5-9 days
• carrier: usps
• class: standard
• service: usps ground advantage

general threadtoollot:

• category: Auto Parts > Supplies > Hand > Threading Tools

seller threadtoollot:

• city: saint louis, missouri
• # reviews: 64
• rating: 100.0%

payments threadtoollot:

• wallet: apple-pay
• credit card: diners-club
• other

returns threadtoollot:

• policy: no returns

offer threadtoollot:

• started: may 24, 2026
• in stock #: 5
• sold #: 7
• availability: in stock
• best offers: true
• options: ship-to-home
• prices: $40.00–$186.72
• item condition:
  • Used
  • New
  • New – Open box