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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 | 5 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 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 M3 x0.5 tap has a reinforced shank to DIN 371: diameter 3.5 mm, square 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 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 0.5 mm/rev, equal to the pitch of the M3 x0.5 thread.
M3 spiral flute machine tap – with a 40° spiral flute
The M3 spiral flute machine tap with aggressive flute geometry is designed for precision tapping of miniature blind holes in electronics and precision engineering. HSSE steel construction with 5% added cobalt guarantees a hardness of 65-67 HRC and long cutting edge life even when machining difficult materials. The 40° spiral flute design directs chips backward, which is essential for blind hole tapping. The short shank in accordance with DIN 371 fits miniature machine tool holders. Tolerance class 6H guarantees the dimensional repeatability required in precision manufacturing.
Technical data for the M3 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 ER11 and ER16 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
- Conforms to DIN 371 ensures standardized short 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 M3 spiral flute tap is used in electronics and precision engineering to manufacture miniature components. The standard pitch of the M3 thread is 0.5 mm, with a tap drill diameter of 2.5 mm. The tool requires careful handling due to its small diameter and the risk of breakage under excessive load.
Cutting data for the M3 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 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum and brass. The M3 size is used in electronics, precision engineering and measuring equipment.
For an M3x0.5 thread in tolerance class 6H, the tap drill diameter should be 2.5 mm. The permissible hole diameter range is 2.5-2.6 mm. A smaller hole increases cutting torque and the risk of tool breakage.
Yes, cooling with tapping oil or minimum quantity lubrication (MQL) is recommended due to the small diameter and risk of breakage. The tool requires careful handling and low cutting speeds.
Product accessories
Hand tap M3 DIN 352/3 6H HSS Bucovice
Reference: 0000004910 In stock > 10 items
€5.53
€6.80 brutto
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Shipping
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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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