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Description
Material HSSE
Thread size M2.5
ChamferC (2–3) threads
Standard DIN 371
Technical data for the M2.5 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M2.5 |
| Thread Pitch P | 0.45 mm |
| Helix Angle | 40° |
| Overall Length l1 | 50 mm |
| Flute Length l2 | 9 mm |
| Length l3 | 14 mm |
| Shank Diameter d2 | 2.8 mm |
| Square Drive Size a | 2.1 mm |
| Tap Drill Diameter | 2.05 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 M2.5 x0.45 tap has a reinforced shank to DIN 371: diameter 2.8 mm, square 2.1 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 0.45 mm/rev, equal to the pitch of the M2.5 x0.45 thread.
M2.5 spiral flute machine tap – with a 40° spiral flute
The miniature tap series designed for precision engineering includes the M2.5 spiral flute machine tap with aggressive 40° flute geometry. The 6H tolerance according to DIN 371 ensures the dimensional repeatability required in series production of electronic components. Made from HSSE steel with 5% added cobalt, it provides a hardness of 65-67 HRC and heat resistance up to 650°C in the cutting zone. The 40° spiral flute directs chips backward when tapping blind holes in miniature bodies and housings.
Why choose the M2.5 spiral flute machine tap
- Compliance with DIN 371 confirms manufacturing quality and ensures standardized short shank dimensions compatible with European miniature tool holders
- Designed for precision engineering includes electronic enclosures, optical components, industrial watches and measuring equipment
- Tolerance class 6H precision ensures full thread interchangeability and dimensional repeatability in high-volume production of miniature components
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C without loss of the cutting edge's mechanical properties
- Form C chamfer for blind holes allows tapping close to the bottom of the hole with a minimal incomplete thread length of 2-3 pitches
- 40° spiral flutes provide aggressive chip evacuation when tapping deep blind holes in miniature components
The M2.5 spiral flute tap is used in the production of electronic components and measuring equipment requiring miniature threads. The standard pitch of the M2.5 thread is 0.45 mm, with a tap drill diameter of 2.05 mm. The tool works with standard coolant emulsions and tapping oils.
Cutting data for the M2.5 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 637-2546 | 287-1146 |
| MStainless steel | 5-10 | 637-1273 | 287-573 |
| KCast iron | 5-15 | 637-1910 | 287-860 |
| NAluminum | 10-25 | 1273-3183 | 573-1432 |
Thread preparation M2.5 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 2.05 mm
3 Tapping
M2.5
✓ 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 M2.5 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum and brass. The M2.5 size is used in electronics, precision engineering and measuring equipment.
For an M2.5x0.45 thread of tolerance class 6H, the recommended tap drill diameter is 2.05 mm. The hole tolerance range should be 2.05 to 2.15 mm. Exceeding the upper limit results in an incomplete thread profile.
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
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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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