STI HexTap for M14x1.25 spark plug thread HSS-G - M 16 x 1.25

• 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

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.

• 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

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, thép không hợp kim và thép hợp kim thấp, and other vật liệu dễ gia công đến 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.