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Description
Material HSS
Thread size M3.5
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M3.5 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M3.5 |
| Thread Pitch P | 0.6 mm |
| Overall Length l1 | 45 mm |
| Flute Length l2 | 12 mm |
| Shank Diameter d2 | 4 mm |
| Square Drive Width Across Flats a | 3 mm |
| Tap Drill Hole | 2.9 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M3.5 x0.6 thread is formed in the wall of a hole with a diameter of 2.9 mm. The thread groove extends 0.3 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 M3.5 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M3.5 x0.6 in five steps
ØDrilling
Drill bit 2.9 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 3.5 mm minus pitch 0.6 mm gives 2.9 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 5.25 mm, or 1.5 times the thread diameter (1.5 x 3.5 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 M3.5 screw.
M3.5 HSS DIN 352 hand tap – 3-piece set for nonstandard threads
The M3.5 hand tap set is a specialized set of three tools for cutting internal threads with a diameter of 3.5 mm and a pitch of 0.6 mm. M3.5 HSS hand taps are designed for repairing older equipment, precision optics, and specialized mechanisms whose design requires an uncommon size between M3 and M4.
Key benefits of the M3.5 tap set
- 3-piece set (roughing, intermediate, and finishing taps) – progressive cutting protects the delicate tool from breakage
- Nonstandard diameter of 3.5 mm – for servicing equipment built to older standards and for specialized applications
- HSS high-speed steel – ensures sharp cutting edges at small diameters
- Tolerance 6H according to DIN 352 – precise fit with M3.5 screws of tolerance class 6g
- Hard-to-find size – essential for restoring and repairing equipment with uncommon threads
The 3-piece M3.5 hand tap set is suitable for service centers repairing older machinery, optical workshops, and companies maintaining measuring equipment. Use a drill bit with a diameter of 2.9 mm to drill the hole for an M3.5 thread. Work gently with a small tap wrench and use tapping oil.
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 2.9 mm drill bit for an M3.5 thread with a pitch of 0.6 mm. Formula: diameter minus pitch (3.5 - 0.6 = 2.9 mm).
M3.5 is not part of the main ISO metric series. It is found in older equipment and specialized optics. M3 or M4 is normally used.
M3.5 screws are available from specialist fastener suppliers and optical equipment stores. They can also be custom-made.
Product accessories
Tapered countersink 6.3/90 DIN 335 C HSS
Reference: 0000004110 In stock > 10 items
€4.21
€5.18 brutto
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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