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Description
Material HSSE-PM
Thread size M8
ChamferC (2–3) threads
Standard DIN 376
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 | 15 mm |
| Length l3 | 35 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Size a | 4.9 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 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 M8 x1.25 tap has a reduced shank according to DIN 376: diameter 6 mm, square size 4.9 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 with long shank
The M8 spiral flute machine tap made of HSSE-PM powder metallurgy steel with a long shank is designed for precision tapping of blind holes in difficult-to-machine materials. Powder metallurgy construction guarantees a uniform microstructure and a hardness of 66-68 HRC while maintaining high cutting edge toughness. The 40° spiral flute design aggressively directs chips backward, which is essential for blind hole tapping. The long shank in accordance with DIN 376 increases clamping rigidity in deep holes.
Technical data for the M8 spiral flute machine tap
- Material versatility covering austenitic and ferritic stainless steels, alloy steels, titanium, and difficult-to-machine nickel and cobalt alloys
- Durability of HSSE-PM powder metallurgy steel increased by the uniform microstructure, allows 800-1200 threads to be produced in stainless steel
- Compatibility with ER20 and ER25 tool holders and collets for precise clamping on machining centers with axial compensation
- Precision to tolerance class 6H for demanding fit tolerances in series production of automotive and hydraulic components
- Conforms to DIN 376 ensures standardized long shank dimensions and full interchangeability with tools from European manufacturers
- 40° flute geometry with form C chamfer allows tapping close to the bottom of a blind hole with a minimal incomplete thread length of 2-3 pitches
The M8 spiral flute tap is used to manufacture stainless steel components for the medical and food industries requiring the highest thread quality. 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 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 M8 HSSE-PM DIN 376 tap is designed for austenitic and ferritic stainless steels, alloy steels, titanium, and difficult-to-machine nickel alloys. The long shank enables tapping in deep pockets and holes with restricted access.
For an M8x1.25 thread in tolerance class 6H, the tap drill diameter should be 6.8 mm. The permissible hole diameter range is 6.8-6.95 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.
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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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