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Description
Material HSS
Thread size M18
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M18 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M18 |
| Thread Pitch P | 2.5 mm |
| Overall Length l1 | 95 mm |
| Flute Length l2 | 30 mm |
| Shank Diameter d2 | 14 mm |
| Square Drive Width Across Flats a | 11 mm |
| Tap Drill Hole | 15.5 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M18 x2.5 thread is formed in the wall of a hole with a diameter of 15.5 mm. The thread groove extends 1.25 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 M18 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M18 x2.5 in five steps
ØDrilling
Drill bit 15.5 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 18 mm minus pitch 2.5 mm gives 15.5 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 27 mm, or 1.5 times the thread diameter (1.5 x 18 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 M18 screw.
M18 HSS hand tap – 3-piece set for general-purpose applications
The M18 HSS hand tap set is a versatile set for producing internal threads with a diameter of 18 mm. The M18 tap set includes a roughing tap, an intermediate tap, and a finishing tap, ensuring precise thread cutting in a wide range of materials – from structural steels to nonferrous metals.
Key advantages of the M18 hand tap set
- Versatile diameter of 18 mm – popular size used in machine building, automotive applications, and hydraulics
- ISO 529 standard – an international standard ensuring tool dimensional precision and repeatability
- High-speed steel HSS 64 HRC – a proven material for machining steels with tensile strengths up to 800 MPa
- Tolerance 6H – a standard internal thread accuracy class for general industrial connections
- Three-stage tapping – controlled thread cutting minimizes the risk of tool damage
M18 hand taps are essential equipment for every machine shop and maintenance department. The M18 tap set is chosen by professionals who value tool versatility and reliability. Order the set and be prepared for common tapping tasks.
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
An M18 thread with a standard pitch of 2.5 mm requires a hole diameter of 15.5 mm. The correct size ensures a full thread profile.
For an M18 tap, a No. 3 tap wrench with a clamping range accommodating a shank approximately 9 mm across is recommended.
M18 threads are used in machine building, hydraulics, automotive applications, steel structures, and industrial equipment repairs.
Product accessories
HSSE 15.5 cobalt metal drill bit DIN 338
Reference: 13293 In stock < 10 items
€15.26
€18.77 brutto
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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