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Description
Material HSS
Thread size M4
Number of pieces2 pcs
Tolerance 6H ISO2
Technical data for the M4 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M4 |
| Thread Pitch P | 0.7 mm |
| Overall Length l1 | 45 mm |
| Flute Length l2 | 12 mm |
| Shank Diameter d2 | 4.5 mm |
| Square Drive Width Across Flats a | 3.4 mm |
| Tap Drill Hole | 3.3 mm |
Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M4 x0.7 thread is cut into the wall of a hole with a diameter of 3.3 mm. The thread groove extends 0.35 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 M4 hole – sequence 1, 2
Hand tapping step by step
Thread M4 x0.7 in four steps
ØDrilling
Drill bit 3.3 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 4 mm minus pitch 0.7 mm gives 3.3 mm. 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 10 mm, or 2.5 times the thread diameter (2.5 x 4 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 M4 screw.
M4 HSS DIN 352 hand tap – 2-piece set for fast tapping of small holes
The M4 hand tap set is an economical set of two tools for cutting internal threads with a diameter of 4 mm and a pitch of 0.7 mm. The two-piece set of M4 HSS hand taps conforming to DIN 352 includes a roughing tap and a finishing tap, speeding up tapping while maintaining good quality. M4 is one of the most common small thread sizes in electronics, model making, and small mechanical assemblies.
Key advantages of the M4 tap set
- 2-piece set (roughing and finishing taps) – cutting in two stages reduces working time
- Common small M4 size – a basic thread in electronics, model making, and small devices
- HSS high-speed steel – versatile machining of steel, aluminum, and brass up to 800 MPa
- Tolerance 6H according to DIN 352 – a standard fit with M4 screws of tolerance class 6g
- Economical option – lower cost than a three-piece set for standard applications
The M4 hand tap set is suitable for electronics workshops, model shops, and minor repairs. To drill the hole for an M4 thread, use a drill bit with a diameter of 3.3 mm. The two-piece set is a practical solution for soft and medium-hard materials.
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
Use a 3.3 mm drill bit for an M4 thread with a pitch of 0.7 mm. Formula: diameter minus pitch (4 - 0.7 = 3.3 mm).
Yes, a two-piece set is sufficient for mild steel and aluminum. A 3-piece set is better for harder steels.
An M4 tap requires a small No. 1 tap wrench that grips a square shank of approximately 3.5 mm. Precision tap wrenches are recommended.
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