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Description
Material HSSE
Thread size M6x0.75
ChamferC (2–3) threads
Standard ISO 529
Technical data for the M6x0.75 blind hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M6x0.75 |
| Thread Pitch P | 0.75 mm |
| Helix Angle | 35° |
| Overall Length l1 | 66 mm |
| Flute Length l2 | 19 mm |
| Length l3 | 30 mm |
| Shank Diameter d2 | 6.3 mm |
| Square Drive Size a | 5 mm |
| Tap Drill Diameter | 5.25 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. The chip cut by the chamfer enters the flute, and the helix carries 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 shank of the M6x0.75 tap has a diameter of 6.3 mm and a square size of 5 mm.
1
The 35° 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 0.75 mm/rev, equal to the pitch of the M6x0.75 thread.
M6x0.75 spiral flute machine tap – compliant with ISO 529
The Fra M6x0.75 spiral flute machine tap compliant with ISO 529 is designed for precision tapping of blind holes in international manufacturing. HSSE steel with 5% cobalt ensures a hardness of 65-67 HRC and long cutting edge life, even when machining difficult materials. The 35° spiral flute design directs chips backward, which is essential for blind hole tapping. The 6H tolerance in accordance with ISO 529 ensures international compatibility and dimensional repeatability.
Technical specifications of the M6x0.75 spiral flute machine tap
- Material versatility covering structural steels with strengths up to 900 MPa, austenitic stainless steels, aluminum, and copper and brass alloys
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of mechanical properties
- Compatibility with ER16 and ER20 tool holders and collets for precise clamping on machining centers with axial compensation
- Precision to tolerance class 6H for tight fit tolerances in series production of electronic and precision engineering components
- Compliance with ISO 529 ensures international compatibility and full interchangeability with tools from global manufacturers
- 35° 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 M6x0.75 spiral flute tap is used in export production and precision engineering requiring international compatibility. The fine pitch of 0.75 mm provides a larger contact area than the standard M6x1 thread. The tap drill diameter for the M6x0.75 thread is 5.25 mm according to fine thread tables.
Cutting data for the M6x0.75 blind hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 265-1061 | 199-796 |
| MStainless steel | 5-10 | 265-531 | 199-398 |
| KCast iron | 5-15 | 265-796 | 199-597 |
| NAluminum | 10-25 | 531-1326 | 398-994 |
Thread preparation M6x0.75 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 5.25 mm
3 Tapping
M6x0.75
✓ Done!
Tolerance 6H
Standard: ISO 529 | 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 M6x0.75 HSSE fine thread machine tap compliant with ISO 529 is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. ISO 529 ensures international compatibility with tools from global manufacturers.
For the M6x0.75 metric fine thread in tolerance class 6H, the recommended tap drill diameter is 5.25 mm. The hole tolerance zone should fall within the range of 5.25 to 5.4 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion at a minimum concentration of 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 minimal lubrication.
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| 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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