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Description
Material HSSE
Thread size M8
ChamferC (2–3) threads
Standard DIN 371
Technical data for the M8 left-hand machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M8 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 40° |
| Tap Drill Diameter | 6.8 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
| Overall length l1 | 90 mm |
| Flute length l2 | 13 mm |
| Length l3 | 35 mm |
| Shank diameter d2 | 8 mm |
| Square drive size a | 6.2 mm |
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 left-hand helix at an angle of 40° to the axis. The tap rotates counterclockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix feeds it 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 according to DIN 371: diameter 8 mm, square size 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 counterclockwise – this is how it cuts a left-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 left-hand blind-hole machine tap – HSSE DIN 371
The M8 left-hand machine tap is a professional tool for cutting internal threads in blind holes. Made from HSSE high-speed steel with 5% cobalt and a hardness of 65-67 HRC, it ensures optimal cutting edge life and stable operation at temperatures up to 650°C. Tolerance 6H in accordance with DIN 371.
Main advantages of the M8 left-hand machine tap
- HSSE material – hardness of 65-67 HRC and heat resistance up to 650°C
- Chamfer C (2÷3 threads) – optimal for blind holes
- Tolerance 6H – standard accuracy grade for bolted joints
- Compliance with DIN 371 – verified dimensional quality
- 40° spiral flutes – efficient rearward chip evacuation
The M8 machine tap is used in toolrooms and maintenance departments. The recommended tap drill diameter is 6.8 mm.
Cutting data for the M8 left-hand blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 198-795 | 247-993 |
| MStainless steel | 5-10 | 198-397 | 247-496 |
| KCast iron | 5-15 | 198-596 | 247-745 |
| NAluminum | 10-25 | 397-994 | 496-1242 |
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)
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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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