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Description
Material HSSE-PM
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 | 40° |
| Overall Length l1 | 110 mm |
| Flute Length l2 | 18 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 40° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 40° 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 40° 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 – for CNC machining of difficult-to-machine materials
The premium tap series designed for industrial toolrooms includes the M12 spiral flute machine tap made of HSSE-PM powder metallurgy steel. Tolerance class 6H in accordance with DIN 376 guarantees the dimensional repeatability required in series production of precision components. Powder metallurgy construction provides a uniform microstructure and a hardness of 66-68 HRC while maintaining high toughness. The 40° spiral flute directs chips backward when tapping blind holes in difficult-to-machine materials and steels containing inclusions.
Why choose the M12 spiral flute machine tap
- Manufacturing precision to 6H tolerance guarantees dimensional repeatability and full thread interchangeability in series production of mechanical components
- Compliance with DIN 376 confirms quality and ensures standardized long-shank dimensions compatible with European machine tool holders
- Durability of HSSE-PM powder metallurgy steel enhanced by the uniform microstructure, allows 600-900 threads to be cut in structural steel
- Compatibility with ER25 and ER32 tool holders and tapping heads for CNC machining centers with synchronous tapping capability
- Designed for stainless steels austenitic and ferritic grades, as well as difficult-to-machine materials requiring increased tool heat resistance
- 40° spiral flutes ensure aggressive chip evacuation when tapping blind holes up to 2.5D deep without the risk of breakage
The M12 spiral flute tap is suitable for maintenance departments restoring threads and repairing production machinery. The tap drill diameter is 10.2 mm for an M12 thread with a standard pitch of 1.75 mm. The tool works with standard coolant emulsions and tapping oils.
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-PM tap is designed for austenitic and ferritic stainless steels, alloy steels, titanium and difficult-to-machine nickel alloys. The uniform microstructure of the powder metallurgy steel ensures stable operation even in materials containing inclusions.
For the M12x1.75 thread in tolerance class 6H, the tap drill diameter should be 10.2 mm. The permissible hole tolerance range is 10.2-10.4 mm. A smaller hole increases cutting torque, while a larger hole reduces the thread class.
Fana HSSE-PM taps are manufactured using powder metallurgy, providing a uniform microstructure and a hardness of 66-68 HRC compared with 65-67 HRC for standard HSSE. This translates into 30-50% longer tool life when machining stainless steels and improved resistance to chipping.
Product accessories
Counterbore 20X10.2 M12 DIN 373 HSS
Reference: 0000003391 In stock > 10 items
€22.89
€28.16 brutto
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| 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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