- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
FINISHED THREADM12 × 1.5
VARIANT2×D (24 mm)
MATERIALStainless steel
SYSTEMV-Coil
M12x1.5 2xD thread repair insert – V-Coil DIN 8140 helical thread insert
Thread insert technical data table
| V-COIL M12x1.5 2×D THREAD REPAIR INSERT | |
|---|---|
| Restored thread | M12 × 1.5 |
| Thread pitch P | 1.5 mm |
| Length variant | 2×D |
| Insert height | 24 mm |
| Repair system | V-Coil |
| Compatible tap | M12x1.5 4H V-Coil |
| Pre-drilled hole | Ø12.5 mm |
The M12x1.5 V-Coil thread repair insert is a coil made of Helicoil-type stainless steel wire that restores a damaged thread. Installed in a hole tapped with a thread repair tap, it creates a fully functional M12x1.5 thread for a standard bolt. It does not require a larger bolt or replacement of the entire part. The 2xD version, 24 mm high, is selected for deeper threaded holes and higher loads. The design conforms to DIN 8140, form A, which is free-running.
M12x1.5 thread repair step by step – from the hole to the completed joint
Four installation steps in the V-Coil system
Thread repair process M12 × 1.5
1Prepare the hole
diameter: Ø12.5 mm
2Tap the thread
tool: V-Coil 4H
3Screw in the insert
length: 2×D
✓Restore the joint
thread: M12 × 1.5
Screw in the insert using an installation tool — do not stretch it or twist it sideways.
Practical installation checks
Before installation, clean chips and coolant residue out of the hole. Screw in the insert with an installation tool, keeping it straight and using no force. A properly seated insert sits 1/4–1/2 of a turn below the surface. Finally, break off the tang (the crosspiece at the bottom of the insert) with a punch; if the hole is blind, remove the broken piece so that it does not obstruct the screw.
Helicoil-type insert made from diamond-section wire – construction and operating principle
How the insert stays in the hole
The insert wire has a diamond-shaped cross section, so it works on both sides simultaneously: the outer edge engages the thread in the hole, while the inner edge forms a new thread for the screw. Before installation, the coil is slightly larger than the hole. As it is screwed in, the coils compress; when the tool is released, they expand and lock permanently in place — without adhesive. The wire has a minimum tensile strength of 1400 MPa — the new thread is harder and smoother than a thread cut directly into the material.
Why a standard M12x1.5 tap will not work here
The insert wire has a thickness of approx. 0.98 mm (calculated from the thread pitch: 0.65 × 1.5 mm).
The thread for the insert must accommodate the wire on both sides of the profile, so its diameter is approx. 13.95 mm — approximately 1.9 mm larger than a standard M12x1.5 thread (12 mm).
This enlarged thread can only be cut with a thread repair tap M12x1.5 4H V-Coil, after drilling the hole Ø12.5 mm. Once the insert is screwed in, the screw again engages a standard thread M12 × 1.5.
M12x1.5 thread repair in steel, stainless steel, cast iron and aluminum
When to choose the 2xD version
The insert restores threads in steel, stainless steel, cast iron, and aluminum, as well as magnesium and plastics. The length is selected according to the parent material and bolt property class. The version 2xD (24 mm) is suitable for typical threaded holes in aluminum. A shorter 1.5xD insert is selected for a shallow hole in steel. A longer 2.5–3xD insert is used in soft materials and with bolts of property class 8.8 and higher. The M12x1.5 thread is found in oil pan drain plugs, among other applications. Forces are distributed evenly because the first thread carries half the load.
Thread strength: how much load each turn carries
| Thread turn | Standard thread (without an insert) | Thread with a V-Coil insert |
|---|---|---|
| 1 (first from the screw head) | 50% | 30% |
| 2 | 25% | 22% |
| 3 | 12% | 17% |
| 4 | 6% | 13% |
| 5 | 3% | 10% |
| 6 | 2% | 8% |
How to read the table: when the screw is tightened, each thread turn carries part of its load. In a standard thread, the first turn carries as much as 50% of the load — and it strips first. With an insert, the same turn carries only 30% because the load is distributed over the entire thread length. Catalog data from wire thread insert manufacturers.
M12x1.5 2×D insert compatibility – required V-Coil system tools
Check before purchasing
✓Nominal thread: M12x1.5 with a pitch of 1.5 mm.
✓Tap: special M12x1.5 4H V-Coil thread repair tap.
✓Tap drill hole: Ø12.5 mm drill bit.
▲Depth: space for an insert 24 mm high and proper seating.
▲
What to remember before repair
The insert requires an STI thread cut with a V-Coil system thread repair tap — a standard M12x1.5 tap cuts a smaller thread in which the insert will not seat. The free-running version does not lock the screw: use threadlocker or a screw-locking insert for joints exposed to vibration.
The M12x1.5 2xD V-Coil thread repair insert creates a joint in which the weakest point is the bolt, rather than the thread in the repaired part. Allow for the depth: 24 mm equals two thread diameters (2 × 12 mm) — this is the space the hole must provide. The same insert is also used to reinforce threads in series production.
Frequently asked questions
The length depends on the parent material and bolt property class: the weaker the material and the stronger the bolt, the longer the insert. The 1.5xD version is suitable for steel and cast iron; 2xD is standard for aluminum, while 2.5–3xD is for soft materials and bolts of property class 8.8. The insert shown has a length of 2xD (24 mm).
No, the coil is larger than the tapped hole thread and wedges itself permanently in place. Threadlocker is used only under severe vibration. An alternative in that case is a screw-locking insert conforming to DIN 8140 form B.
No, the insert requires an STI thread with a diameter of approximately 13.95 mm. A standard M12x1.5 thread is 12 mm, making it approximately 1.9 mm too small. The hole is drilled to Ø12.5 mm and tapped with an M12x1.5 4H V-Coil tap.
It is most commonly found in BMW oil pan drain plugs and engine sensor connections. It is also a common metric fine thread for mounting accessories in European cars. A pitch of 1.5 mm at a diameter of 12 mm produces a compact, shallow thread profile.
Product accessories
Thread repair tap M12x1.5 4H V-Coil
Reference: 0000005935 In stock > 10 items
€17.37
€21.36 brutto
Reviews
No customer reviews for the moment.
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 |
Recommended for you
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.