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Description
FINISHED THREADM12 × 1.5
TOLERANCE4H
PRE-DRILLED HOLEØ12.5 mm
LENGTH L195 mm
M12x1.5 thread repair tap – STI tap for V-Coil M12x1.5 inserts
Tool dimension table and technical data
| V-COIL M12x1.5 THREAD REPAIR TAP | |
|---|---|
| Thread to be repaired | M12 × 1.5 |
| Tolerance class | 4H |
| Tap diameter B | 14 mm |
| Overall length L1 | 95 mm |
| Flute length L2 | 30 mm |
| Shank diameter D2 | 11.2 mm |
| Square drive a | 9 mm |
| Pre-drilled hole | Ø12.5 mm |
The V-Coil M12x1.5 thread repair tap cuts an STI (Screw Thread Insert) thread for a Helicoil-type insert. The tool restores a load-bearing seat in the damaged component without increasing the bolt size. Once the insert is installed, the hole again accepts a standard M12x1.5 bolt without modifying the fastener. The 11.2 mm shank with a 9 mm square drive fits standard hand tap wrenches and ratcheting tap wrenches.
Repairing stripped M12x1.5 threads in steel, stainless steel, cast iron, and aluminum
Materials, tips, and limitations
The tool works in steel, stainless steel, cast iron, and aluminum, covering the full range of workshop repairs. Threads strip most frequently in soft metals, while in steel the insert improves the fatigue life of the joint. M12x1.5 threads are found, for example, in oil pan drain plugs and engine sensor ports. The pilot hole is drilled to Ø12.5 mm for the STI tap; drill at the upper tolerance limit and tap with coolant.
The cut STI thread has dimensions conforming to DIN 8140-2, so the M12x1.5 thread repair tap prepares a seat for any insert complying with this standard — lengths of 2xD are available in the store. The tool measures 95 mm (L1) with a flute length of 30 mm (L2), and the repaired thread carries loads comparable to or greater than the original.
Repairing an M12x1.5 thread step by step
From drilling to the nominal thread
Repairing with an insert is faster and less expensive than replacing the entire component, such as a housing with a threaded sensor port.
Thread repair M12x1.5 with a wire insert
1Drilling
Hole: Ø12.5 mm
2Chamfering the hole entrance
Angle: 90–120°
3STI tapping
With coolant, 4H
4Insert installation
Tang: break off
✓Nominal thread
Screw: M12 × 1.5
In a blind hole, remove the broken-off tang before installing the screw
M12x1.5 Helicoil tap (STI) – why it is larger than a standard tap
Compensating for the wire thickness of the thread insert
The STI thread profile remains a metric 60° triangle with a 1.5 mm pitch — only the size changes. The diameter increases by twice the insert wire thickness: D STI = 12 + 1.3 × 1.5 = 13.95 mm. This is why the tool's cutting section measures 14 mm, and neither an M14 nor an M16 tap can replace it. Class 4H is the metric equivalent of inch class 3B, also recommended for screw-locking inserts. Once the insert is installed, the bolt engages a standard class 6H thread.
Tap compatibility with the V-Coil insert
What must match before starting the repair
✓Matching size: V-Coil M12x1.5 insert with a 1.5 mm pitch.
✓Matching hole: prepare a Ø12.5 mm diameter before tapping.
✓Matching version: available M12x1.5 insert lengths: 2xD.
▲Required inspection: depth and wall thickness of the component being repaired.
Tool exclusively for insert threads
The thread cut by this tool is larger than nominal and is intended solely for installing a V-Coil insert. Use a standard tap to cut a standard M12x1.5 thread — never to prepare a seat for an insert.
Frequently asked questions
For the repair insert, drill a hole Ø12.5 mm, which is larger than the 10.5 mm required for a standard M12x1.5 thread. Drill at the upper tolerance limit to leave a material allowance for cutting the profile. Chamfer the entrance at 90 to 120° to help the tap enter.
The STI tap cuts a profile with a major diameter of approximately 13.95 mm instead of 12 mm, because it must accommodate the 0.98 mm thick insert wire on both sides. The 1.5 mm pitch and 60° angle remain identical to those of a standard tap. Thanks to DIN 8140, inserts from different brands remain interchangeable.
Yes, the inner edge of the wire restores the nominal M12 × 1.5 thread. The minor diameter after installation is approximately 10.38 mm and complies with ISO 724. You can install a standard bolt without any modifications.
M12 × 1.5 threads are found in BMW oil pan drain plugs and engine system sensor ports. This is also a common metric fine thread for accessory mounting in European cars. The 1.5 mm pitch produces a compact, shallow profile typical of fittings and sensors.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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