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Description
Material HSS
Thread size M12
Number of pieces2 pcs
Tolerance 6H ISO2
Technical data for the M12 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M12 |
| Thread Pitch P | 1.75 mm |
| Overall Length l1 | 89 mm |
| Flute Length l2 | 29 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Width Across Flats a | 7.1 mm |
| Tap Drill Hole | 10.2 mm |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M12 x1.75 thread is cut into the wall of a hole with a diameter of 10.2 mm. The thread groove extends 0.9 mm into the wall. A single tap would have to cut the entire groove at once – by hand, this creates 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 M12 hole – sequence 1, 2
Hand tapping step by step
Thread M12 x1.75 in four steps
ØDrilling
Drill bit 10.2 mm
1Roughing tap
Chamfer 8 threads
2Finishing tap
Chamfer 2 threads
✓Finished thread
Tolerance 6H
Turning sequence: half a turn clockwise, a quarter turn counterclockwise | Between taps: remove chips from the hole
Start with the hole. The drill diameter is easy to calculate: thread diameter 12 mm minus pitch 1.75 mm gives 10.25 mm — in practice, use a 10.2 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 30 mm, or 2.5 times the thread diameter (2.5 x 12 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 in the tap wrench and position it perpendicular to the surface. Check the angle from two sides, for example with a square. Turn half a turn clockwise, then a quarter turn counterclockwise. 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 the chips from the hole. Screw the finishing tap into the cut threads by hand – it should engage them naturally. Continue turning with the same rhythm used for the roughing tap. The finishing tap removes the remaining material and cuts the groove to the full profile in tolerance class 6H. When it screws in smoothly all the way, the thread is complete – check it with an M12 screw.
M12 HSS hand tap DIN 352 – 2-piece set for fast tapping
The M12 hand tap set is a practical set of two tools for cutting internal threads with a diameter of 12 mm and a pitch of 1.75 mm. The two-piece version of the M12 HSS hand tap set conforming to DIN 352 includes a roughing tap and a finishing tap, which speeds up tapping while maintaining high quality. M12 is one of the most popular sizes in the machinery industry and construction.
Key advantages of the M12 tap set
- 2-piece set (roughing and finishing taps) – two-stage cutting reduces working time by one third
- Popular M12 size – a predominant thread in steel structures, machinery, and automotive applications
- HSS high-speed steel – enables machining of steel, aluminum, and cast iron up to 800 MPa
- Tolerance 6H according to DIN 352 – precise fit with M12 screws of tolerance class 6g
- Economical alternative – lower cost than a three-piece set while providing adequate quality
The M12 hand tap set is suitable for machine shops, construction sites, and maintenance departments. Use a drill bit with a diameter of 10.2 mm to drill the tap hole for an M12 thread. The two-piece set is optimal for materials of medium hardness and threads that do not require extreme precision.
Tolerance 6H — metric thread tolerance classes
| Class | Accuracy | Application | Status |
|---|---|---|---|
| 4H / 4g | High | Precision connections, hydraulics | — |
| 6H / 6g | Standard | Machine building, general-purpose | SELECTED |
| 7H / 8g | Low | Large clearance, easy assembly | — |
6H = internal thread (nut, hole) | 6g = external thread (screw)
Frequently asked questions
The 2-piece set omits the intermediate tap. The roughing tap removes more material, which requires greater force but reduces working time.
A 10.2 mm drill bit is used for an M12 thread with a pitch of 1.75 mm. Calculation: 12 - 1.75 ≈ 10.25 mm.
A 2-piece set is sufficient for mild steels and aluminum. A 3-piece set is better for harder steels or deep holes.
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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