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Description
Material HSSE-PM
Thread size M8
ChamferC (2–3) threads
Standard DIN 371
Technical data for the M8 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M8 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 40° |
| Overall Length l1 | 90 mm |
| Flute Length l2 | 20 mm |
| Length l3 | 35 mm |
| Shank Diameter d2 | 8 mm |
| Square Drive Size a | 6.2 mm |
| Tap Drill Diameter | 6.8 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 spiral to the right 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 auger in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The M8 x1.25 tap has a reinforced shank to DIN 371: diameter 8 mm, square 6.2 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 1.25 mm/rev, equal to the pitch of the M8 x1.25 thread.
M8 spiral flute machine tap – premium powder metallurgy steel
The M8 spiral flute machine tap is a professional tool made of HSSE-PM powder metallurgy steel for cutting threads in difficult-to-machine materials. The 40° spiral flute design efficiently evacuates chips backward, eliminating the risk of jamming during blind hole tapping. Powder metallurgy construction guarantees a uniform microstructure and a hardness of 66-68 HRC while maintaining high toughness. Tolerance class 6H in accordance with DIN 371 ensures the dimensional repeatability required in series production.
Key advantages of the M8 spiral flute machine tap
- Durability of HSSE-PM powder metallurgy steel increased by the uniform microstructure, allows 800-1000 threads to be produced in structural steel with proper cooling
- 40° spiral flute geometry directs chips backward during cutting, which is essential when tapping blind holes without the risk of jamming
- Tolerance class 6H precision in accordance with DIN 371 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 ER25 tool holders and tapping chucks with axial compensation for CNC machining centers
The M8 spiral flute tap is suitable for series production of components made from stainless steels and difficult-to-machine materials. The standard pitch of the M8 thread is 1.25 mm, with a tap drill diameter of 6.8 mm. This premium tool is recommended for applications requiring maximum tool life and thread surface quality.
Cutting data for the M8 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 199-796 | 249-995 |
| MStainless steel | 5-10 | 199-398 | 249-498 |
| KCast iron | 5-15 | 199-597 | 249-746 |
| NAluminum | 10-25 | 398-995 | 498-1244 |
Thread preparation M8 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 6.8 mm
3 Tapping
M8
✓ Done!
Tolerance 6H
Standard: DIN 371 | 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 M8 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 M8x1.25 thread in tolerance class 6H, the tap drill diameter should be 6.8 mm. The permissible hole tolerance range is 6.8-6.95 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.
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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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