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Description
FINISHED THREADM16 × 1.5
TOLERANCE4H
PRE-DRILLED HOLEØ16.5 mm
LENGTH L1104 mm
M16x1.5 thread repair tap – STI tap for V-Coil M16x1.5 inserts
Tool dimension table and technical data
| V-COIL M16x1.5 THREAD REPAIR TAP | |
|---|---|
| Thread to be repaired | M16 × 1.5 |
| Tolerance class | 4H |
| Tap diameter B | 18 mm |
| Overall length L1 | 104 mm |
| Flute length L2 | 29 mm |
| Shank diameter D2 | 14 mm |
| Square drive a | 11.2 mm |
| Pre-drilled hole | Ø16.5 mm |
The V-Coil M16x1.5 thread repair tap cuts an STI (Screw Thread Insert) thread for a Helicoil-type insert. The tool restores a load-bearing thread in a damaged hole without increasing the screw size. Once the insert is installed, the hole accepts a standard M16x1.5 screw without modifying the fastener. The 14 mm shank with a 11.2 mm square drive fits typical hand tap wrenches and ensures secure guidance.
Repairing stripped M16x1.5 threads in steel, stainless steel, cast iron, and aluminum
Materials, tips, and limitations
The tool works in steel, stainless steel, cast iron, and aluminum. Threads strip most often in soft metals, while in steel the insert improves the fatigue life of the joint. This thread is found, for example, in coolant and oil temperature sensors and in drain plugs on many cars. The pilot hole is drilled to Ø16.5 mm for the STI tap. Drilling is performed at the upper tolerance limit and tapping with coolant, producing a clean, full profile.
The dimensions of the cut STI thread are specified by DIN 8140-2. The M16x1.5 thread repair tap has an overall length L1 of 104 mm and a flute length L2 of 29 mm and is compatible with V-Coil inserts in lengths of 2xD. A correctly installed insert provides a thread with a load capacity comparable to or greater than the original.
Repairing an M16x1.5 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 cylinder head with a temperature sensor port.
Thread repair M16x1.5 with a wire insert
1Drilling
Hole: Ø16.5 mm
2Chamfering the hole entrance
Angle: 90–120°
3STI tapping
With coolant, 4H
4Insert installation
Tang: break off
✓Nominal thread
Screw: M16 × 1.5
In a blind hole, remove the broken-off tang before installing the screw
M16x1.5 Helicoil tap (STI) – why it is larger than a standard tap
Compensating for the wire thickness of the thread insert
The STI tool differs from a standard M16x1.5 tap only in profile size — the 60° angle and 1.5 mm pitch remain metric. The insert wire takes up space on both sides of the profile, so the diameter is D STI = 16 + 1.3 × 1.5 = 17.95 mm; hence the nonstandard 18 mm cutting section, which neither an M18 nor an M20 tap can provide. Tolerance class 4H (equivalent to inch class 3B) is also used for screw-locking inserts, while the finished thread after insert installation is class 6H.
Tap compatibility with the V-Coil insert
What must match before starting the repair
✓Matching size: V-Coil M16x1.5 insert with a 1.5 mm pitch.
✓Matching hole: prepare a Ø16.5 mm diameter before tapping.
✓Matching version: available M16x1.5 insert lengths: 2xD.
▲Required inspection: depth and wall thickness of the component being repaired.
This is not a standard M16x1.5 tap
The tool prepares an oversized mounting thread for a V-Coil insert. Do not use it to cut a standard M16x1.5 thread without an insert, and do not substitute a standard tap for it when installing an insert.
Frequently asked questions
The STI thread requires a hole of Ø16.5 mm, rather than 14.5 mm as for a standard thread. Drilling is performed at the upper tolerance limit. Chamfering the hole entrance at an angle of 90 to 120° is recommended.
No, the STI thread has a nonstandard diameter 17.95 mm, which neither M18 nor M20 can reproduce. An incorrect profile prevents the insert from locking in the hole. The tool's cutting diameter B is 18 mm.
Yes, the inner edge of the wire restores the nominal M16 × 1.5 thread. The minor diameter after installation is approximately 14.38 mm and conforms to ISO 724. The screw can be installed without any modifications.
This size is found in coolant and oil temperature sensors and in drain plugs on many cars, including Peugeot, Renault, Volvo, and newer Subaru models. Sensor connections may be disassembled during diagnostics, so the insert provides a thread M16x1.5 that withstands repeated assembly.
Product accessories
HSSE 16.5 cobalt metal drill bit DIN 338
Reference: 13295 In stock < 10 items
€17.63
€21.69 brutto
Thread repair insert M16x1.5 2xD V-Coil
Reference: 0000010272 In stock > 10 items
€1.26
€1.55 brutto
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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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