Thread Repair Kits, UNC No. 2 x 56

• 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

• 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

• 1x STI-Short Machine Taps, ForD, HSS-G, UNC No. 2 x 56 VÖLKEL 03100
• 1x Tang Break Tools, No. 2 VÖLKEL 07002
• 1x Inserting tool with locking ring, No. 2 VÖLKEL 08002
• 20x Wire thread inserts - type S - free running UNC No. 2 x 56 – 1.5 D
• 1x STI Twist drill 2.4 mm

1. Drill out the damaged thread with the included STI twist drill (2.4 mm).
2. Cut a new, oversized receiving thread into the pre-drilled hole with the provided STI tap.
3. Mount the V-COIL inserting tool onto the thread insert and slowly screw it in until the coil is approximately 0.25 to 0.5 turns below the surface.
4. Break off the tang with the included tang break tool by lightly striking it.
5. Your new, high-strength thread is now ready for use.

Q: What is a V-COIL Thread Repair Kit?

A: A V-COIL kit is used to repair damaged threads. The system consists of a twist drill, a special STI tap, an inserting tool, and the thread inserts. The supplied thread inserts are screwed into the pre-made thread to create a new, durable threaded hole.

Q: In what materials can I use V-COIL?

A: Thread repair with V-COIL is suitable for a variety of materials, especially those with low shear strength like aluminum, brass, magnesium, and plastics. V-COIL can also be used in steel and cast iron to reinforce threads.

Q: Why is the thread stronger after the repair?

A: The V-COIL thread insert distributes the load more evenly over the entire length of the thread turns. Since the insert is made of stainless steel, it has higher strength and hardness than the surrounding material. This makes the thread more resistant to wear and overload.

Q: Do I always have to break off the tang at the end?

A: Yes, the tang serves as a guide and assembly tool to screw in the thread insert. After the insert is fully installed, the tang must be broken off so that it does not block any other components and the thread is freely accessible. This is especially important for blind holes.

Q: What does "UNC No. 2 x 56" mean?

A: UNC stands for "Unified National Coarse," an American thread standard. "No. 2" describes the diameter of the screw (approx. 2.18 mm) and "56" the threads per inch (56 TPI). This standard is often used in precision mechanics.