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Machine Tap M12x1.25 DIN 374/35 C HSSE
0000006957
€24.92 tax inc.
Net price: €20.26
Description
Material HSSE
Thread size M12x1.25
ChamferC (2–3) threads
Standard DIN 374
Technical data for the M12x1.25 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M12x1.25 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 35° |
| Overall Length l1 | 100 mm |
| Flute Length l2 | 20 mm |
| Length l3 | 42 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Size a | 7 mm |
| Tap Drill Diameter | 10.8 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. Chips cut by the chamfer enter the flute, and the helix carries them upward like the auger in a meat grinder. The bottom of the hole stays clear, and the cutting edges do not encounter packed chips. The M12x1.25 tap has a reduced shank to DIN 374: diameter 9 mm, square drive 7 mm.
1
The 35° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 1.25 mm/rev, equal to the pitch of the M12x1.25 thread.
M12x1.25 spiral flute machine tap – for blind holes
The M12x1.25 spiral flute machine tap is a professional tool for cutting metric fine threads in blind holes up to 2.5D deep. The 35° spiral flute design ensures efficient backward chip evacuation, eliminating the risk of jamming during blind hole tapping. Made from HSSE steel with 5% added cobalt, it guarantees a hardness of 65-67 HRC and thermal stability up to 650°C. The 6H tolerance in accordance with DIN 374 ensures the dimensional repeatability required in series production. The tool is intended for CNC operators, toolrooms, and maintenance departments.
Key benefits of the M12x1.25 spiral flute machine tap
- 35° spiral flute geometry directs chips backward during cutting, which is essential when tapping blind holes without the risk of damaging the hole bottom
- Durability enhanced by the addition of 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of the tool's mechanical properties
- Tolerance class 6H precision in accordance with DIN 374 guarantees full thread interchangeability and dimensional repeatability in series production
- Material versatility covering structural steels up to 900 MPa, austenitic stainless steels 304/316, aluminum, and copper and brass alloys
- Chamfer form C allows tapping close to the bottom of a blind hole with a minimal incomplete thread length of just 2-3 pitches
- Compatibility with ER25 and ER32 tool holders and tapping chucks with axial compensation for CNC machining centers and automatic lathes
The M12x1.25 spiral flute tap is suitable for automotive series production and assembly lines requiring high repeatability. The fine pitch of 1.25 mm provides a larger contact area than the standard M12x1.75 thread. The tap drill diameter for the M12x1.25 thread is 10.8 mm according to metric fine thread tables.
Cutting data for the M12x1.25 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 133-531 | 166-664 |
| MStainless steel | 5-10 | 133-265 | 166-331 |
| KCast iron | 5-15 | 133-398 | 166-498 |
| NAluminum | 10-25 | 265-663 | 331-829 |
Thread preparation M12x1.25 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 10.8 mm
3 Tapping
M12x1.25
✓ Done!
Tolerance 6H
Standard: DIN 374 | Chamfer: C (spiral flute) | Application: blind holes
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
The M12x1.25 HSSE metric fine machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. The intermediate pitch of 1.25 mm is used in steel structures requiring connections with increased strength.
For the M12x1.25 metric fine thread in tolerance class 6H, the tap drill diameter should be 10.75 mm. The permissible hole tolerance range is 10.75-10.95 mm. A smaller hole increases cutting torque and the risk of tool breakage.
Yes, cooling with an oil emulsion at a minimum concentration of 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimal lubrication.
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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