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V-COIL STI HexTap Thread Tap M14x1.25 for Spark Plug Threads | HSS-G – M16x1.25

V-COIL STI HexTap Thread Tap for M14x1.25 Spark Plug Threads HSS-G - M16x1.25

The V-COIL STI HexTap Thread Tap is the precise solution for repairing damaged spark plug threads. Instead of expensive replacements, it allows quick, clean and durable restoration directly in the engine. This high-quality tool cuts the oversize thread for the suitable V-COIL insert that restores the original M14x1.25 thread.

Thanks to the Multi-Drive system, you can work flexibly: the internal hex (SW4) can be used with a ratchet or angle driver, while the external hex (SW16) allows use with an open-end or ring spanner. Ideal for workshops, mechanics and professional technicians working in confined spaces.

Application & Benefits

  • For repairing damaged M14x1.25 spark plug threads
  • Multi-Drive system for maximum flexibility during use
  • Combination tool: drilling, pre-tapping and final tapping in one step
  • Made from precision-ground HSS-G for high accuracy and long tool life
  • Suitable for materials up to 900 N/mm²
  • Also available as part of V-COIL repair kits

Step-by-Step Instructions

  1. Preparation: Remove the spark plug, clean the damaged thread, and clear oil or carbon residue.
  2. Drill out the core hole: If necessary, enlarge the damaged thread to the correct diameter.
  3. Cut the oversize thread: Align the V-COIL STI HexTap and cut evenly using cutting oil.
  4. Insert the V-COIL insert: Screw in the matching V-COIL thread insert until it sits flush with the surface.
  5. Final check: Install a new spark plug and ensure a tight and secure fit.

Technical Details

  • Material: HSS-G
  • Tolerance: ISO 2 / 6H
  • Nominal size: M16 x 1.25 (for M14 x 1.25 inserts)
  • Overall length (L1): 70 mm
  • Thread length (L2): 41 mm
  • External hex (SW1): 16 mm
  • Internal hex (SW2): 4 mm
  • EAN: 4022835190011
  • Article number: 19001

FAQ

What does STI mean?
STI stands for "Screw Thread Insert" – a special thread for V-COIL inserts. The STI tap cuts the oversize thread for the insert with the original M14x1.25 thread.

Which materials is it suitable for?
Aluminium, unalloyed and low-alloy steels, and other easily machinable materials up to 900 N/mm².

What is the advantage of the Multi-Drive system?
The internal and external hex drive enables maximum flexibility – ideal in confined spaces in engine compartments.

Are matching V-COIL inserts available?
Yes, V-COIL offers matching M14x1.25 thread inserts perfectly suited for this STI HexTap.

Do I need a separate drill?
The HexTap combines drilling and tapping in one tool. Only in severe damage cases is separate pre-drilling required.

Need advice on the correct V-COIL inserts or application? Contact us via the contact form.

Additional information
Type of thread metric ISO-thread
Standard Works Standard
Material HSS-G
Tolerance ISO2 (6H)
Size M 16 x 1.25
Overall length (L1) 70 mm
Thread length (L2) 41 mm
Width across flat (SW1) 16.0 mm
Width across flat (SW2) 4 mm
EAN 4022835190011
Item number 19001
Type of flute straight fluted
Application for through holes
Thread standard DIN 18
V-COIL STI HexTap Thread Tap M14x1.25 for Spark Plug Threads | HSS-G – M16x1.25

V-COIL STI HexTap Thread Tap for M14x1.25 Spark Plug Threads HSS-G - M16x1.25

The V-COIL STI HexTap Thread Tap is the precise solution for repairing damaged spark plug threads. Instead of expensive replacements, it allows quick, clean and durable restoration directly in the engine. This high-quality tool cuts the oversize thread for the suitable V-COIL insert that restores the original M14x1.25 thread.

Thanks to the Multi-Drive system, you can work flexibly: the internal hex (SW4) can be used with a ratchet or angle driver, while the external hex (SW16) allows use with an open-end or ring spanner. Ideal for workshops, mechanics and professional technicians working in confined spaces.

Application & Benefits

  • For repairing damaged M14x1.25 spark plug threads
  • Multi-Drive system for maximum flexibility during use
  • Combination tool: drilling, pre-tapping and final tapping in one step
  • Made from precision-ground HSS-G for high accuracy and long tool life
  • Suitable for materials up to 900 N/mm²
  • Also available as part of V-COIL repair kits

Step-by-Step Instructions

  1. Preparation: Remove the spark plug, clean the damaged thread, and clear oil or carbon residue.
  2. Drill out the core hole: If necessary, enlarge the damaged thread to the correct diameter.
  3. Cut the oversize thread: Align the V-COIL STI HexTap and cut evenly using cutting oil.
  4. Insert the V-COIL insert: Screw in the matching V-COIL thread insert until it sits flush with the surface.
  5. Final check: Install a new spark plug and ensure a tight and secure fit.

Technical Details

  • Material: HSS-G
  • Tolerance: ISO 2 / 6H
  • Nominal size: M16 x 1.25 (for M14 x 1.25 inserts)
  • Overall length (L1): 70 mm
  • Thread length (L2): 41 mm
  • External hex (SW1): 16 mm
  • Internal hex (SW2): 4 mm
  • EAN: 4022835190011
  • Article number: 19001

FAQ

What does STI mean?
STI stands for "Screw Thread Insert" – a special thread for V-COIL inserts. The STI tap cuts the oversize thread for the insert with the original M14x1.25 thread.

Which materials is it suitable for?
Aluminium, unalloyed and low-alloy steels, and other easily machinable materials up to 900 N/mm².

What is the advantage of the Multi-Drive system?
The internal and external hex drive enables maximum flexibility – ideal in confined spaces in engine compartments.

Are matching V-COIL inserts available?
Yes, V-COIL offers matching M14x1.25 thread inserts perfectly suited for this STI HexTap.

Do I need a separate drill?
The HexTap combines drilling and tapping in one tool. Only in severe damage cases is separate pre-drilling required.

Need advice on the correct V-COIL inserts or application? Contact us via the contact form.

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