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Description
Material HSSE-PM
Thread size M4
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M4 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M4 |
| Thread Pitch P | 0.7 mm |
| Helix Angle | 40° |
| Overall Length l1 | 63 mm |
| Flute Length l2 | 13 mm |
| Length l3 | 21 mm |
| Shank Diameter d2 | 2.8 mm |
| Square Drive Size a | 2.1 mm |
| Tap Drill Diameter | 3.3 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 M4 x0.7 tap has a reduced shank according to DIN 376: diameter 2.8 mm, square size 2.1 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 0.7 mm/rev, equal to the pitch of the M4 x0.7 thread.
M4 spiral flute machine tap – premium with TC coating
The M4 spiral flute machine tap is a professional tool made from HSSE-PM powder metallurgy steel with a TC coating for cutting threads in difficult-to-machine materials. Its 40° spiral flute design provides efficient backward chip evacuation, eliminating the risk of jamming during blind tapping. Powder metallurgy manufacturing ensures a uniform microstructure and a hardness of 66-68 HRC while maintaining high toughness. The TC coating increases wear resistance and lowers the coefficient of friction. The 6H tolerance according to DIN 376 ensures dimensional repeatability.
Key advantages of the M4 spiral flute machine tap
- TC coating increases wear resistance and lowers the coefficient of friction, extending tool life by a factor of 2-3 compared with the uncoated version
- Durability of HSSE-PM powder metallurgy steel enhanced by the uniform microstructure, allows machining of difficult-to-machine materials and steels containing inclusions
- Tolerance class 6H precision in accordance with DIN 376 guarantees full thread interchangeability and dimensional repeatability in series production
- Material versatility covering austenitic and ferritic stainless steels, alloy steels, titanium, and nickel and cobalt 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 ER16 and ER20 tool holders and tapping chucks with axial compensation for CNC machining centers
The M4 spiral flute tap is suitable for series production of components made from stainless steels and difficult-to-machine materials. The standard pitch of the M4 thread is 0.7 mm, with a tap drill diameter of 3.3 mm. This premium tool is recommended for applications requiring maximum tool life and thread surface quality.
Cutting data for the M4 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 398-1592 | 279-1114 |
| MStainless steel | 5-10 | 398-796 | 279-557 |
| KCast iron | 5-15 | 398-1194 | 279-836 |
| NAluminum | 10-25 | 796-1989 | 557-1392 |
Thread preparation M4 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 3.3 mm
3 Tapping
M4
✓ 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 M4 HSSE-PM TC tap is designed for austenitic and ferritic stainless steels, alloy steels, titanium and difficult-to-machine nickel alloys. The TC coating further increases wear resistance and reduces friction.
For an M4x0.7 thread in tolerance class 6H, the tap drill diameter should be 3.3 mm. The permissible hole diameter range is 3.3-3.4 mm. A smaller hole increases cutting torque and the risk of tool breakage.
Fana HSSE-PM taps manufactured using powder metallurgy achieve a hardness of 66-68 HRC while maintaining high toughness. Compared with HSSE, they provide 30-50% longer tool life in stainless steels and better cutting edge resistance to chipping when machining materials with inclusions.
Product accessories
M4 HSSE INOX 6g DIN 22 568 Fanar tooling
Reference: 0000007076 In stock < 10 items
€12.89
€15.86 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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