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Description
Material HSS
Thread size M12
Number of pieces3 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 | 75 mm |
| Flute Length l2 | 24 mm |
| Shank Diameter d2 | 8 mm |
| Square Drive Width Across Flats a | 7 mm |
| Tap Drill Hole | 10.2 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M12 x1.75 thread is formed in 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 three layers.
The drawing shows the entire set in operation. All three taps have the same shank and the same length. They differ in chamfer length: No. 1 has a taper spanning 7–10 threads, while No. 3 spans only 1–2 threads. The detail views at the hole wall show how the thread groove deepens after each tap.
| Tap | Chamfer | Material removed | How it works in the hole |
|---|---|---|---|
| No. 1 – roughing tap | long, 7–10 threads | approx. 60% | enters smoothly and establishes thread alignment |
| No. 2 – intermediate | medium, 3–5 threads | approx. 30% | screws into the previously cut threads and starts cutting only deeper in the hole |
| No. 3 – finishing tap | short, 1–2 threads | approx. 10% + sizing | turns easily and produces the full 6H profile |
How to identify the tap numbers in the set
The chamfer is the tapered end of the tap. No. 1 has the longest chamfer and No. 3 the shortest – the difference is immediately visible when they are placed side by side. No. 1 and No. 2 have shallower thread profiles; only No. 3 has the full profile. The number can also be identified on the shank: No. 1 has one ring, No. 2 has two, and No. 3 has none. Keep the set together and always start with the roughing tap.
How to tap an M12 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M12 x1.75 in five steps
ØDrilling
Drill bit 10.2 mm
1Roughing tap
Removes approx. 60%
2Intermediate
Removes approx. 30%
3Finishing tap
Removes approx. 10%
✓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 18 mm, or 1.5 times the thread diameter (1.5 x 12 mm, shown as 1.5D in the drawing). Drill the hole deeper than the thread. The clearance below the thread accommodates chips and the finishing tap chamfer.
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 and No. 3 – deepening and full profile
Unscrew the roughing tap and remove chips from the hole. Screw the intermediate tap by hand into the previously cut threads – it should engage them naturally. It turns easily at first and starts cutting only deeper in the hole. The finishing tap enters with almost no resistance and cuts the final portion of the profile only at the end. When it screws smoothly all the way in, the thread is ready – check it with an M12 screw.
M12 HSS hand tap DIN 352 – durable 3-piece set for workshops
The M12 hand tap set is a professional set of three tools for producing internal threads with a diameter of 12 mm and a pitch of 1.75 mm. M12 HSS hand taps are among the most commonly used sizes in machinery manufacturing, steel construction, and vehicle repair, where strong bolted connections are required.
Key benefits of the M12 tap set
- 3-piece set (roughing, intermediate, and finishing taps) – three-stage cutting reduces cutting forces by up to 40% compared with 2-piece sets
- Popular industrial size – M12 thread used in steel structures, machinery, and motor vehicles
- HSS high-speed steel – allows machining of materials with tensile strengths up to 800 MPa, including St3S and S235 steels
- 6H tolerance according to DIN 352 – guarantees proper fit with screws in tolerance class 6g without additional sizing
- 9 mm square shank – compatible with standard tap wrenches for medium-sized taps
The 3-piece M12 hand tap set is suitable for maintenance departments, automotive repair shops, and steel construction companies. For proper tapping, drill the hole with a 10.2 mm drill bit. Use tapping oil for optimum thread surface finish.
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
A 10.2 mm drill bit is used for an M12 thread with a pitch of 1.75 mm. Formula: diameter minus pitch (12 - 1.75 = 10.25 mm, rounded to 10.2 mm).
The HSS tool machines carbon and structural steels with tensile strengths up to 800 MPa, gray cast iron, aluminum, brass, and bronze. For stainless steel, we recommend the HSSE version.
The M12 tap has a 9 mm square shank. It fits tap wrenches marked as size 3 or with a range of 5-12 mm.
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| 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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