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Description
Material HSSE
Thread size M12
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M12 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M12 |
| Thread Pitch P | 1.75 mm |
| Helix Angle | 35° |
| Overall Length l1 | 110 mm |
| Flute Length l2 | 29 mm |
| Length l3 | 42 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Size a | 7 mm |
| Tap Drill Diameter | 10.2 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 screw in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The M12 x1.75 tap has a reduced shank according to DIN 376: diameter 9 mm, square size 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 1.75 mm/rev, equal to the pitch of the M12 x1.75 thread.
M12 spiral flute machine tap – with a 35° spiral flute
The M12 spiral flute machine tap with a long shank is designed for precision tapping of blind holes in series production. Made from HSSE steel with 5% added cobalt, it guarantees a hardness of 65-67 HRC and long cutting edge life, even when machining stainless steels. The 35° spiral flute design directs chips backward, which is essential for blind hole tapping. The long shank in accordance with DIN 376 increases clamping rigidity in machine tool holders. The 6H tolerance guarantees the dimensional repeatability required in industrial production.
Key features of the M12 spiral flute machine tap
- Compatibility with ER25 and ER32 tool holders and collets for precise clamping on machining centers with axial compensation
- Tolerance class 6H precision in accordance with DIN 376 guarantees full thread interchangeability and dimensional repeatability in series production
- Designed for automotive series production includes engine, transmission, suspension, and braking system components requiring high quality
- Conforms to DIN 376 ensures standardized long shank dimensions and full interchangeability with tools from European manufacturers
- Durability of HSSE steel with 5% cobalt allows machining of structural steels up to 900 MPa, stainless steels, and aluminum alloys
- 35° geometry with form C allows tapping close to the bottom of a blind hole with a minimal incomplete thread length of 2-3 pitches
The M12 spiral flute tap is used in automotive series production and on assembly lines requiring high repeatability. The standard pitch of the M12 thread is 1.75 mm, with a tap drill diameter of 10.2 mm. The tool is compatible with standard mineral oil-based tapping lubricants and coolant emulsions.
Cutting data for the M12 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 133-531 | 233-929 |
| MStainless steel | 5-10 | 133-265 | 233-464 |
| KCast iron | 5-15 | 133-398 | 233-696 |
| NAluminum | 10-25 | 265-663 | 464-1160 |
Thread preparation M12 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 10.2 mm
3 Tapping
M12
✓ Done!
Tolerance 6H
Standard: DIN 376 | 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 M12 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, austenitic stainless steels 304/316, aluminum, brass, and gray cast iron. HSSE steel with 5% cobalt also allows machining of alloy steels with appropriate cooling.
For the M12x1.75 thread in tolerance class 6H, the recommended tap drill diameter is 10.2 mm. The hole tolerance range should be within 10.2 to 10.4 mm. Exceeding the upper limit results in an incomplete thread profile and a lower tolerance class.
Yes, cooling with an oil emulsion of at least 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 minimum quantity lubrication (MQL).
Product accessories
Counterbore 20X10.2 M12 DIN 373 HSS
Reference: 0000003391 In stock > 10 items
€22.89
€28.16 brutto
Machine tap M12 DIN 376 B HSSE Narex
Reference: 0000005515 In stock > 10 items
€11.58
€14.24 brutto
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| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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