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Description
Material HSS
Thread size M1.8
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M1.8 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M1.8 |
| Thread Pitch P | 0.35 mm |
| Overall Length l1 | 41 mm |
| Flute Length l2 | 6.2 mm |
| Shank Diameter d2 | 2.5 mm |
| Square Drive Width Across Flats a | 2 mm |
| Tap Drill Hole | 1.45 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M1.8 x0.35 thread is formed in the wall of a hole with a diameter of 1.45 mm. The thread groove extends 0.175 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 M1.8 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M1.8 x0.35 in five steps
ØDrilling
Drill bit 1.45 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 1.8 mm minus pitch 0.35 mm gives 1.45 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 2.7 mm, or 1.5 times the thread diameter (1.5 x 1.8 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 M1.8 screw.
M1.8 HSS hand tap ISO 529 – 3-piece set for precision microthreads
The M1.8 hand tap set is a specialized set of three tools for cutting internal threads with a diameter of 1.8 mm and a pitch of 0.35 mm. M1.8 HSS hand taps conforming to ISO 529 are used in precision mechanics, optics, and measuring instrument manufacturing, where a nonstandard microthread diameter is required by design specifications or space constraints.
Key benefits of the M1.8 tap set
- 3-piece set (roughing, intermediate, and finishing taps) – three-stage cutting protects the delicate tool from damage
- Nonstandard diameter of 1.8 mm – fills the gap between M1.6 and M2 in micromechanics
- HSS high-speed steel – guarantees the cutting edge sharpness required for miniature diameters
- Tolerance 6H in accordance with ISO 529 – an international standard ensuring a precise fit
- Applications in optics and measurement – for precision instruments and specialized microcomponents
The M1.8 hand tap set is suitable for optical manufacturing facilities, measurement laboratories, and precision instrument manufacturers. Use a drill bit with a diameter of 1.45 mm to drill the tap hole for an M1.8 thread. The work requires a small precision tap wrench, good lighting, and patience.
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 1.45 mm drill bit for an M1.8 thread with a pitch of 0.35 mm. Calculation: 1.8 - 0.35 = 1.45 mm.
M1.8 is used when M2 is too large and M1.6 is too small. It is a solution for specific design requirements in micromechanics.
M1.8 screws are available from specialized fastener suppliers for micromechanics and precision optics.
Product accessories
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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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