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Hand Tap M15X1 DIN 352/2 6H HSS
Net price: €15.53
Description
Technical data for the M15x1 hand tap
| Technical data | |
|---|---|
| Nominal diameter d1 mm | M15 |
| Thread pitch P mm | 1 mm |
| Overall length l1 | 70 mm |
| Flute length l2 | 22 mm |
| Shank diameter d2 | 12 mm |
| Square drive size a | 9 mm |
| Tap drill diameter | 14 mm |
| Thread angle G | 60° |
| Tap tolerance | ISO2 6H |

Roughing tap and finishing tap – how much material each removes
Division of work in the 1–2 set
The M15x1 thread is cut into the wall of a hole with a diameter of 14 mm. The thread groove extends 0.5 mm into the wall. A single tap would have to cut the entire groove at once, requiring substantial hand torque and risking 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 M15x1 hole – sequence 1, 2
Hand tapping step by step
Thread M15x1 in four steps
Drill bit 14 mm
Chamfer 8 threads
Chamfer 2 threads
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 15 mm minus pitch 1 mm gives 14 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 37.5 mm, or 2.5 times the thread diameter (2.5 x 15 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
Back out the roughing tap and remove chips from the hole. Screw the finishing tap into the cut threads by hand – it should engage them on its own. Continue turning at the same rhythm as with the roughing tap. The finishing tap removes the remaining material and cuts the groove to the full profile within tolerance 6H. When it screws in smoothly all the way, the thread is complete – check it with an M15x1 screw.
M15x1 fine thread hand taps, 2-piece set
M15X1 Hand Tap in a 2-piece HSS configuration, compliant with DIN 2181 and tolerance 6H, designed for precision cutting of metric fine threads in steels and cast iron, is the M15x1 hand tap.
Specifications: nominal diameter 15 mm; pitch 1; thread angle 60°; right-hand direction; set: roughing tap (I) and finishing tap (II) for use with a tap wrench; ground construction, straight flutes; recommended tap drill size 14 mm for proper thread engagement; straight shank with a square drive for secure clamping. In workshop applications, the M15x1 hand tap set provides a clean profile and controlled roughness of the machined surface.
- Stable guidance - Dividing the work between a roughing tap and a finishing tap reduces cutting forces and minimizes diameter deviations at the entry.
- Dimensional repeatability - Internal thread class 6H and a 60° profile ensure a proper fit with class 6g fasteners.
- Tool life and surface quality - High-speed steel (HSS) and ground construction promote smooth threads and reduce the need for process adjustments.
- Operating ergonomics - M15x1 hand tap set shortens the transition from roughing to finishing while maintaining axial alignment.
Compliance and tolerances: M15x1 per DIN 2181; internal thread class 6H; thread angle 60°; right-hand direction; recommended drill size 14 mm. Hand Tap Set M15X1 maintains dimensions and a clean profile in one-off machining and repair work, in
Stages of cutting an M15x1 thread with a 2-piece set: roughing tap and finishing tap

Frequently asked questions
The set includes two taps – a roughing tap for initial guidance and a finishing tap for forming the final thread profile.
Yes, M15x1 hand taps can be used in both through holes and blind holes.
M15x1 HSS taps are designed for low-carbon steel, aluminum alloys, brass, and other easily machinable metals.
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