V-COIL Thread Repair Assortment VC80 M5–M12 – 111 Years Edition

• Thread Restoration: Permanently repair stripped or damaged threads in engine blocks, casings, and industrial machinery.
• Thread Reinforcement: Ideal for use in aluminum or magnesium alloys to prevent future thread wear and increase load-bearing capacity.
• STI Tapping: The included STI taps are specifically engineered to create the oversize receiving thread required for wire inserts.
• Versatile Environments: A must-have for automotive workshops, maintenance departments, and high-end DIY engineering.

Note: Always ensure the hole is drilled to the precise diameter using the included V-COIL twist drills before tapping for the insert.

• Superior Strength: V-COIL inserts distribute the load over a larger area, often resulting in a thread that is more heat and corrosion-resistant than the original.
• All-in-One Logic: From drilling and tapping to insert installation and tang break-off, every tool is perfectly calibrated to work together.
• Cost-Effective: Avoid expensive part replacements by restoring threads to their original metric dimensions in minutes.
• Organized Performance: The robust metal case ensures that all 165 inserts and corresponding tools are protected and ready for immediate use.

• The system requires sufficient "meat" in the parent material to accommodate the slightly larger STI receiving thread.
• Not suitable for repairing cracks in the base material; the component's structural integrity must be intact.

1. Drilling: Clear the damaged thread using the specific V-COIL twist drill included in the set.
2. Tapping: Use the HSS-G STI machine tap to cut the new receiving thread into the cleared hole.
3. Installation: Place the wire insert onto the installation tool and wind it into the hole with light downward pressure.
4. Tang Removal: Once the insert is seated, use the break-off tool (or the screwdriver for larger sizes) to remove the drive tang.
5. Verification: Check the newly repaired thread with the original bolt to ensure a smooth, high-strength fit.
6. Maintenance: Clean the tools and return them to the case to prevent loss or contamination.

• 5x STI Machine Taps (ISO 529, Form D, HSS-G): M5, M6, M8, M10, M12
• 5x V-COIL Twist Drills: 5.2 / 6.3 / 8.3 / 10.4 / 12.4 mm
• 1x Adjustable Tap Wrench (Steel Version, No. 2)
• 165x V-COIL Inserts (Free-running, Type S):
  • M5 - M10: 10x each in lengths 1.0D, 1.5D, and 2.0D
  • M12: 5x each in lengths 1.0D, 1.5D, and 2.0D
• 1x Pitch Gauge & 1x Screwdriver
• 1x Heavy-duty Metal Case
• 1x 111 Years VÖLKEL Gift Box + Running Shirt Voucher

• Product type: Professional Thread Repair Assortment (VC80)
• Thread system: Metric ISO (Standard)
• Tap Standard: ISO 529 (Ground HSS-G)
• Insert Type: Type S (Free-running, Stainless Steel)
• Range: M5 x 0.8 to M12 x 1.75

What does "STI" stand for in this kit?
STI stands for Screw Thread Insert. These taps cut a specific oversize thread that allows the wire insert to sit perfectly, so the final internal diameter matches your original metric bolt.

Is a V-COIL repair as strong as a new thread?
Usually, it’s stronger. Because the insert is made of stainless steel and has a flexible design, it compensates for pitch and angle errors, distributing the load more evenly across the parent material.

Can I use these taps in a machine?
Yes, the included STI taps are machine-capable (Form D), though they are also perfectly suited for manual use with the provided tap wrench.

Why are there different insert lengths (1.0D, 1.5D, 2.0D)?
The "D" stands for Diameter. For example, a 1.5D insert for M6 is 9mm long. Different lengths allow you to match the repair to the thickness of your workpiece and the required load capacity.

Where can I find more technical data?
For detailed installation dimensions and drill sizes, please download the V-COIL Technical Information (PDF).