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Description
Material HSSE
Thread size M6
ChamferC (2–3) threads
Standard DIN 371
Technical data for the M6 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M6 |
| Thread Pitch P | 1 mm |
| Helix Angle | 40° |
| Overall Length l1 | 80 mm |
| Flute Length l2 | 18 mm |
| Length l3 | 30 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Size a | 4.9 mm |
| Tap Drill Diameter | 5 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 M6 x1 tap has a reinforced shank to DIN 371: diameter 6 mm, square 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 mm/rev, equal to the pitch of the M6 x1 thread.
M6 spiral flute machine tap – with a 40° spiral flute
The M6 spiral flute machine tap from the standard series is designed for tapping blind holes up to 2.5D deep. Made from HSSE steel with 5% added cobalt, it provides a hardness of 65-67 HRC and high cutting edge heat resistance up to 650°C. The 40° spiral flute ensures aggressive chip evacuation when tapping deep blind holes. Its form C chamfer makes the tool particularly suitable for blind tapping close to the bottom of the hole. The 6H tolerance according to DIN 371 meets series production requirements.
Key features of the M6 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 371 confirms quality and ensures standardized short shank dimensions compatible with European machine tool holders
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C without loss of the cutting edge's mechanical properties
- Compatibility with ER16 and ER20 tool holders and tapping heads for CNC machining centers with synchronous tapping capability
- Designed for series production includes automotive components, electronic enclosures, suspension components and measuring equipment
- 40° spiral flutes ensure aggressive chip evacuation when tapping blind holes up to 2.5D deep without the risk of breakage
The M6 spiral flute tap is suitable for automotive series production and assembly lines requiring high repeatability. The standard pitch of the M6 thread is 1 mm, with a tap drill diameter of 5 mm. The tool works with standard coolant emulsions and tapping oils.
Cutting data for the M6 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 265-1061 | 265-1061 |
| MStainless steel | 5-10 | 265-531 | 265-531 |
| KCast iron | 5-15 | 265-796 | 265-796 |
| NAluminum | 10-25 | 531-1326 | 531-1326 |
Thread preparation M6 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 5 mm
3 Tapping
M6
✓ 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 M6 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, austenitic stainless steels 304/316, aluminum, brass, and gray cast iron. HSSE steel with 5% cobalt also allows machining of alloy steels with appropriate cooling.
For the M6x1 thread in tolerance class 6H, the recommended tap drill diameter is 5 mm. The hole tolerance range should be within 5.0 to 5.15 mm. Exceeding the upper limit results in an incomplete thread profile and a lower tolerance class.
Yes, cooling with an oil emulsion of at least 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimum quantity lubrication (MQL).
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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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