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Description
Material HSS
Thread size M11
Number of pieces3 pcs
Tolerance 6H ISO2
Technical data for the M11 hand tap
| Technical data | |
|---|---|
| Thread Diameter d1 | M11 |
| Thread Pitch P | 1.5 mm |
| Overall Length l1 | 70 mm |
| Flute Length l2 | 22 mm |
| Shank Diameter d2 | 8 mm |
| Square Drive Width Across Flats a | 6.2 mm |
| Tap Drill Hole | 9.5 mm |
Roughing, intermediate, and finishing taps – how much material each removes
Division of work in the 1–2–3 set
The M11 x1.5 thread is formed in the wall of a hole with a diameter of 9.5 mm. The thread groove extends 0.75 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 M11 hole – sequence 1, 2, 3
Hand tapping step by step
Thread M11 x1.5 in five steps
ØDrilling
Drill bit 9.5 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 11 mm minus pitch 1.5 mm gives 9.5 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 16.5 mm, or 1.5 times the thread diameter (1.5 x 11 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 M11 screw.
M11 HSS hand tap – 3-piece set for nonstandard threads
The M11 HSS hand tap set is a professional set for producing internal threads with a diameter of 11 mm. The M11 tap set contains three tools – a taper tap, a plug tap, and a bottoming tap – essential for precisely cutting this less common metric thread size.
Key advantages of the M11 hand tap set
- Nonstandard diameter M11 – a solution for specialized applications requiring a thread between M10 and M12
- HSS high-speed steel – a proven material with high hardness for efficient cutting of structural steels
- DIN 352 – an international standard ensuring tool quality and dimensional precision
- Tolerance class 6H – general-purpose internal thread accuracy for general industrial applications
- Three-stage process – progressive thread cutting ensures a clean profile and minimal cutting forces
M11 hand taps are essential for repairing and manufacturing components with nonstandard threads. The M11 tap set is chosen by workshops and maintenance departments working with machines that require this specific size. Order the set and be ready for any task.
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
For an M11 thread with a pitch of 1.5 mm, drill a hole with a diameter of 9.5 mm. This size ensures a full thread profile.
The M11 thread is used in older European machines, optical equipment, measuring instruments, and specialized mechanical assemblies.
M11 screws are a nonstandard size and are available mainly from specialist fastener suppliers.
Product accessories
Tapered countersink 16.5/90 DIN 335 B HSS
Reference: 0000006120 In stock > 10 items
€23.68
€29.13 brutto
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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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