Thread Repair Workshop Kit UNF 1/4 – UNF 1/2

V-COIL Thread Repair Kit UNF 1/4" - 1/2": Your Solution for High-Strength Threads

Damaged threads are no longer a worry! The V-COIL Thread Repair Kit UNF 1/4" - 1/2" is your comprehensive solution for the quick and durable repair of defective or worn internal threads. This professional set not only provides reliable thread restoration but also significantly increases the load-bearing capacity of threads in soft materials. It's ideal for maintenance, assembly, and small series production, allowing you to create high-quality and long-lasting threaded connections or salvage rejected parts.

What Makes the V-COIL Thread Repair Kit So Special?

The V-COIL system is based on thread inserts made of stainless steel (Type S - free running according to DIN 8140, tolerance ISO 2 (6H)), which represent a superior alternative to conventional thread repair methods.

Your advantages at a glance:

• Higher Thread Load Capacity After Repair: The elastic stainless steel thread inserts distribute the load more evenly across the thread, often exceeding the strength of the original thread, especially in materials with low shear strength like aluminum or magnesium.

• Corrosion and Temperature Resistance: The stainless steel inserts offer excellent protection against corrosion and withstand high temperatures, extending the lifespan of the repaired connection.

• Cost-Effectiveness: By salvaging rejected parts and improving thread longevity, you reduce your manufacturing and repair costs in the long run. The kit's favorable price makes the investment quickly pay off.

• Flexible Readiness for Use: The kit includes more inserts and spiral drills for the most common UNF dimensions from 1/4" to 1/2". This ensures you're well-equipped for a variety of repairs.

• Optimized for Manual Use: The included STI taps, installation tools, and tang breakers are specially designed for easy and precise handling.

• Attractive and Functional Packaging: All components are neatly organized in an appealing and robust package, significantly simplifying handling in daily work.

Application Areas of the V-COIL System:

• Thread Repair: Perfect for quick and reliable repair of damaged or worn threads in all materials, from metals to plastics.

• Thread Reinforcement: Ideal for strengthening threads in soft materials with low shear strength. The stainless steel inserts increase pull-out strength and enable high-strength connections.

• Reclaiming Rejected Parts: You can easily repair expensive workpieces with faulty threads instead of discarding them as scrap.

• Creating High-Strength Threads: Also suitable for new designs to achieve durable and extremely robust threads from the outset.

How to Use the V-COIL System: Step-by-Step to a New Thread

Using the V-COIL thread repair kit is simple and requires only a few steps. The kit contains all the necessary tools:

1. Drill out the damaged thread:

   • Select the appropriate STI spiral drill bit from the kit, whose diameter exactly matches the thread to be repaired (e.g., for UNF 1/4", the 6.7 mm drill bit is included).

   • Carefully drill out the damaged thread. Ensure a straight drilling path to create an optimal base for the new thread.

2. Tap the thread for the insert:

   • Insert the corresponding STI single-pass tap (e.g., UNF 1/4 x 28) into your tap wrench or drilling machine.

   • Cut the receiving thread for the thread insert into the drilled hole. Since these are STI taps, they create a special oversized thread into which the V-COIL insert is screwed precisely. Always use sufficient cutting oil.

3. Insert the thread insert:

   • Select the appropriate thread insert (e.g., UNF 1/4 x 28 – 1.5 D) and the corresponding manual installation tool with locking ring (e.g., No. 9).

   • Place the thread insert onto the installation tool. The driving tang of the insert must engage with the slot of the installation tool.

   • Carefully and evenly screw the thread insert into the previously cut receiving thread until it is flush with the workpiece surface.

4. Break off the driving tang:

   • Once the thread insert is fully installed, the driving tang (the small pin used for screwing in) must be removed.

   • Place the appropriate tang breaker (e.g., No. 9) onto the tang and strike it briefly and firmly with a hammer. The tang will break cleanly at its predetermined breaking point.

5. Finished Thread:

   • Your new, high-strength, and durable thread is now ready for use!

Kit Contents:

This comprehensive kit includes all the necessary tools and inserts to immediately begin thread repair or reinforcement:

• 5x STI Single-Pass Taps, Form D, HSS-G:

  • UNF 1/4 x 28 (VÖLKEL 03155)

  • UNF 5/16 x 24 (VÖLKEL 03156)

  • UNF 3/8 x 24 (VÖLKEL 03157)

  • UNF 7/16 x 20 (VÖLKEL 03158)

  • UNF 1/2 x 20 (VÖLKEL 03159)

• 5x Tang Breakers:

  • No. 9 (VÖLKEL 07009)

  • No. 11 (VÖLKEL 07011)

  • No. 13 (VÖLKEL 07013)

  • No. 14 (VÖLKEL 07014)

  • No. 15 (VÖLKEL 07015)

• 5x Manual Installation Tools with Locking Ring:

  • No. 9 (VÖLKEL 08009)

  • No. 11 (VÖLKEL 08011)

  • No. 13 (VÖLKEL 08013)

  • No. 14 (VÖLKEL 08014)

  • No. 15 (VÖLKEL 08015)

• Thread Inserts - Type S - free running (Length: 1.5 D):

  • 25x UNF 1/4 x 28

  • 25x UNF 5/16 x 24

  • 25x UNF 3/8 x 24

  • 10x UNF 7/16 x 20

  • 10x UNF 1/2 x 20

• STI Spiral Drills:

  • 6.7 mm

  • 8.3 mm

  • 9.8 mm

  • 11.5 mm

  • 13.0 mm

Invest in the V-COIL Thread Repair Kit UNF 1/4" - 1/2" and secure a professional, cost-effective, and extremely durable solution for all your thread problems!

Application:

• Thread Repair of damaged or worn-out threads
• Thread Armour Plating for material with low shear strength
• Recovery of rejected items
• for new highly stable and long-lasting internal threads
• perfect for maintenance, installation and small series production
• Wire Thread Inserts DIN 8140, tolerance ISO 2 (6H), Type S - free running, from stainless steel
• assortment with the most popular dimensions in an attractive and functional case

Advantages:

• flexible application through more inserts and drills for the dimensions up to M12
• high stock availability for standard and special dimensions
• for thread cutting by hand
• higher load capacity after the repair by better thread properties,
• temperature and corrosion resistance
• best price
• attractive and functional presentation case

Contents:

• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 1/4 x 28 VÖLKEL 03155
• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 5/16 x 24 VÖLKEL 03156
• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 3/8 x 24 VÖLKEL 03157
• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 7/16 x 20 VÖLKEL 03158
• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 1/2 x 20 VÖLKEL 03159
• 1x Tang Break Tools, No. 9 VÖLKEL 07009
• 1x Tang Break Tools, No. 11 VÖLKEL 07011
• 1x Tang Break Tools, No. 13 VÖLKEL 07013
• 1x Tang Break Tools, No. 14 VÖLKEL 07014
• 1x Tang Break Tools, No. 15 VÖLKEL 07015
• 1x Inserting tool with locking ring, No. 9 VÖLKEL 08009
• 1x Inserting tool with locking ring, No. 11 VÖLKEL 08011
• 1x Inserting tool with locking ring, No. 13 VÖLKEL 08013
• 1x Inserting tool with locking ring, No. 14 VÖLKEL 08014
• 1x Inserting tool with locking ring, No. 15 VÖLKEL 08015
• 25x Wire thread inserts - type S - free running UNF 1/4 x 28 – 1.5 D
• 25x Wire thread inserts - type S - free running UNF 5/16 x 24 – 1.5 D
• 25x Wire thread inserts - type S - free running UNF 3/8 x 24 – 1.5 D
• 10x Wire thread inserts - type S - free running UNF 7/16 x 20 – 1.5 D
• 10x Wire thread inserts - type S - free running UNF 1/2 x 20 – 1.5 D
• STI Twist drill 6.7/8.3/9.8/11.5/13.0 mm