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Description
Material HSSE
Thread size M3
ChamferC (2–3) threads
Standard DIN 371
Technical data for the M3 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M3 |
| Thread Pitch P | 0.5 mm |
| Helix Angle | 40° |
| Overall Length l1 | 56 mm |
| Flute Length l2 | 10 mm |
| Length l3 | 18 mm |
| Shank Diameter d2 | 3.5 mm |
| Square Drive Size a | 2.7 mm |
| Tap Drill Diameter | 2.5 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 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 M3 x0.5 tap has a reinforced shank according to DIN 371: diameter 3.5 mm, square size 2.7 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 0.5 mm/rev, equal to the pitch of the M3 x0.5 thread.
M3 left-hand spiral flute machine tap – for left-hand threads
The M3 left-hand spiral flute machine tap is a professional tool for cutting left-hand threads in blind holes up to 2.5D deep. The 40° spiral flute design ensures efficient backward chip evacuation, eliminating the risk of jamming during blind-hole tapping. Made from HSSE steel with 5% cobalt, it guarantees a hardness of 65-67 HRC and thermal stability up to 650°C. The 6H tolerance in accordance with DIN 371 ensures the dimensional repeatability required in series production. The tool is intended for special applications requiring a left-hand thread.
Main advantages of the M3 left-hand spiral flute machine tap
- 40° spiral flute geometry directs chips backward during cutting, which is essential when tapping blind holes without the risk of damaging the hole bottom
- Left-hand thread direction intended for special applications requiring protection against self-loosening in the clockwise direction
- Tolerance class 6H precision in accordance with DIN 371 guarantees full thread interchangeability and dimensional repeatability in series production
- Material versatility covering structural steels with strengths up to 900 MPa, austenitic stainless steels, aluminum, and copper and brass 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 ER11 and ER16 tool holders and tapping chucks with axial compensation for CNC machining centers
The M3 left-hand spiral flute tap is suitable for manufacturing rotating components and mechanisms requiring protection against loosening. The standard pitch of the M3 thread is 0.5 mm, with a tap drill diameter of 2.5 mm. The tool requires the spindle rotation direction to be reversed during tapping.
Cutting data for the M3 left-hand blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 531-2122 | 266-1061 |
| MStainless steel | 5-10 | 531-1061 | 266-530 |
| KCast iron | 5-15 | 531-1592 | 266-796 |
| NAluminum | 10-25 | 1061-2653 | 530-1326 |
Thread preparation M3 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 2.5 mm
3 Tapping
M3
✓ 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 M3 left-hand spiral flute HSSE machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum, and brass. Left-hand threads are used in mechanisms requiring protection against self-loosening.
For an M3x0.5 left-hand thread in tolerance class 6H, the recommended tap drill diameter is 2.5 mm. The hole tolerance zone should fall within the range of 2.5 to 2.6 mm. The geometric parameters are identical to those of a right-hand thread.
Yes, cooling with tapping oil or minimum quantity lubrication (MQL) is recommended due to the small diameter and risk of breakage. The tool requires the spindle rotation direction to be reversed during tapping.
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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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