Thread Repair Kits for spark plug threads M14x1,25, HexTap SP, 12,7 / 17,5mm

• Restore damaged internal threads in components, housings, and machine parts.
• Use when you need a repair process that supports repeated service and fastener replacement.
• Common in maintenance, overhaul, and field repair where replacement parts are costly.
• Process: manual driving or assisted driving depending on your holder and machine setup
• Use: thread cutting, re tapping, and thread cleaning depending on condition
• Use stable workholding, because movement during the start often causes oversize threads.

Note Use the matching STI tap and installation tooling for the insert system in the product name.

• Restores functional threads without replacing the full component
• Supports repeatable fastener assembly after repair
• Reduces downtime in maintenance and overhaul work
• Helps standardize repair steps across service locations

• Not suitable for every work material without correct cutting fluid and stable alignment
• Practical speed is limited by manual handling and by access conditions at the workpiece

1. Assess the damage and confirm that thread repair is the appropriate option for the component.
2. Secure the workpiece and align your tooling to the original thread axis.
3. Remove the damaged thread using the preparation drill step required by the repair system.
4. Create the STI thread using the correct STI tap for the insert system in the product name.
5. Clean the hole and remove chips and cutting fluid residues.
6. Install the wire thread insert with the matching installation tool and stop at the intended position.
7. If the insert style uses a tang, remove the tang using the correct breaking tool and keep the bore clean.
8. Verify the repaired thread with the intended fastener or a suitable gauge and protect the repaired area.

• for the simple and fast repair of defective Spark Plug Threads M14x1.25
• Recovery of rejected items
• for new highly stable and long-lasting internal threads
• with STI Combined Taps or HexTap SP
• with Wire Thread Inserts, DIN 8140, tolerance ISO 2 (6H), Type S - free running or Solid Thread Inserts SP from stainless steel

Advantages:

• high stock availability
• higher load capacity after the repair by better thread properties,
• temperature and corrosion resistance
• best price

Contents:

• 1x HexTap SP Multi-Drive for spark plug threads M 16x1.25 VÖLKEL 19001
• 5x Solid Thread Inserts SP, stainless steel, 14 x 1.25 12.7mm VÖLKEL 19138
• 5x Solid Thread Inserts SP, stainless steel, 14 x 1.25 17.5mm VÖLKEL 19139

• Product type: Thread Repair Kit
• System: Wire thread insert based repair process
• Thread designation: M

How do you select the correct thread designation for this product

Match the thread designation in the product name to the mating fastener or component standard, then confirm that your workpiece material and process setup suit the tool type. If you work with mixed standards, separate your tooling by thread family to avoid mix ups.

What preparation steps are typical in a wire insert repair

A typical workflow includes drilling out the damaged thread, cutting an STI thread with the matching tap, cleaning the hole, then installing the insert. Correct alignment through all steps is essential for a straight repaired thread.

Where do you find more technical information for this tool type

Technical information V-COIL thread repair as PDF

Which hole preparation checks matter most

Prepare the entry edge, remove burrs, and keep the hole clean so the tool starts straight. In blind holes, confirm that there is enough depth for the tool lead and chip space. In through holes, support chip evacuation out of the exit side.

How do you reduce the risk of misalignment

Start the tool with the axis visually aligned, then guide it through the first turns with low torque. Use stable workholding and avoid side load. If a thread feels tight early, remove the tool, clean chips, and inspect the entry.

When is an insert repair the right choice

Use an insert when the original thread is stripped or repeatedly loosened and you need a serviceable thread for repeated assembly. Inserts are common in soft alloys and in parts that see frequent maintenance. Confirm that there is enough wall thickness for the repair.

Where can you find the full VÖLKEL catalog section for this product family

VC 23 catalog as PDF