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Hand Tap M10X1.25 LH DIN 2181/2 6H HSS
0000003551
Thread size: M10x1,2542 sizes of this tap
€22.66 tax inc.
Net price: €18.42
Description
Technical data for the M10x1.25 left-hand hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M10 |
| Thread pitch P mm | 1.25 mm |
| Overall length l1 | 76 mm |
| Flute length l2 | 20 mm |
| Shank diameter d2 | 10 mm |
| Square drive size a | 8 mm |
| Tap drill diameter | 8.8 mm |
| Thread angle G | 60° |
| Tap tolerance | ISO2 6H |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M10x1.25 LH thread is cut into the wall of a hole with a diameter of 8.8 mm. The thread groove extends 0.6 mm into the wall. A single tap would have to cut the entire groove at once — by hand, this means high resistance and a risk of breakage. The set divides this work into two passes.
The drawing shows the entire set in operation. Both taps have the same shank and the same length. They differ in their chamfer, the tapered tip: No. 1 has a chamfer spanning 8 threads, while No. 2 spans only 2 threads. The detail windows at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Chamfer angle | Material removed | How it works in the hole |
|---|---|---|---|---|
| No. 1 – roughing tap | long, 8 threads | 5° | the main portion of the groove | enters smoothly and establishes thread alignment |
| No. 2 – finishing tap | short, 2 threads | 20° | the remainder, to the full profile | follows the cut threads and produces the full 6H profile |
How to distinguish the taps in the set
The chamfer on No. 1 is 4 times as long as the chamfer on No. 2 — the difference is immediately visible when you place them side by side. No. 1 has an incomplete thread profile; only No. 2 has the full profile. The number is also indicated on the shank: No. 1 has one ring, No. 2 has none. Keep the set together and always start with the roughing tap.
How to tap an M10x1.25 LH hole – sequence 1, 2
Hand tapping step by step
Thread M10x1.25 LH in four steps
ØDrilling
Drill bit 8.8 mm
1Roughing tap
Chamfer 8 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Tolerance 6H
Turning sequence: half a turn counterclockwise, a quarter turn clockwise | Between taps: remove chips from the hole
Start with the hole. The drill diameter is easy to calculate: thread diameter 10 mm minus pitch 1.25 mm gives 8.75 mm — in practice, use a 8.8 mm drill bit. An undersized hole is a common cause of a tap twisting off in the workpiece.
Through hole or blind hole – how deep to drill
The set taps both types of holes. In a through hole, the thread extends through the full material thickness. In a blind hole, cut the thread to 25 mm, or 2.5 times the thread diameter (2.5 x 10 mm, shown as 2.5D in the drawing). Drill the hole deeper than the thread. The finishing tap has a chamfer spanning 2 threads, so approx. 2 incomplete threads remain near the bottom. The extra depth below the thread accommodates them along with the chips.
No. 1 – the roughing tap establishes thread alignment
Fit the roughing tap into a tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. This is a left-hand thread, so turn in the opposite direction to usual: half a turn counterclockwise, then a quarter turn clockwise. Reversing breaks the chip into short pieces — a slight crunch is normal. The first threads determine whether the thread will be straight.
No. 2 – the finishing tap produces the full profile
Unscrew the roughing tap and remove chips from the hole. Screw the finishing tap by hand into the cut threads — it should engage them naturally. Continue with the same turning sequence as for the roughing tap. The finishing tap removes the remaining material and cuts the groove to its full profile within 6H tolerance. Once it screws smoothly all the way in, the thread is complete — check it with an M10x1.25 LH screw.
Left-hand metric fine hand taps M10x1.25
M10x1.25 left-hand hand tap DIN 2181 6H HSS is a tool designed for cutting left-hand metric fine threads with a pitch of 1.25 mm. The set includes two tools — a roughing tap and a finishing tap — allowing staged machining with full process control. The tool meets DIN 2181 requirements and thread tolerance class 6H, ensuring repeatable results in both through holes and blind holes.
Manufacturer Narex supplies tools distinguished by precision, attention to detail, and highly stable operation. High-speed steel (HSS) ensures wear resistance and long service life even when machining demanding materials such as structural steel, aluminum, or brass. This makes the tap suitable for both workshops and industrial facilities.
The set is operated using a tap wrench fitted to the square drive, allowing secure tool guidance and safe tapping.
Key features:
- Left-hand thread (LH) – designed for connections requiring opposite directions of rotation.
- 2-piece set – roughing tap and finishing tap used in sequence.
- Manufacturer Narex– precision, attention to detail, and stable operation.
- HSS high-speed steel – high wear resistance and long service life.
- Versatile applications – for through holes and blind holes.
Stages of cutting an M10x1.25 left-hand thread with a 2-piece set: roughing tap and finishing tap
Frequently asked questions
LH denotes a left-hand thread, which is cut in the opposite direction to a standard right-hand thread.
The set consists of two taps — a roughing tap and a finishing tap — which ensure a fully formed thread when used in stages.
Yes, the set is designed for through holes and blind holes.
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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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