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Description
Material HSSE
Thread size M2.5
ChamferC (2–3) threads
Standard ISO 529
Technical data for the M2.5 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M2.5 |
| Thread Pitch P | 0.45 mm |
| Helix Angle | 35° |
| Overall Length l1 | 45 mm |
| Flute Length l2 | 15 mm |
| Length l3 | 15 mm |
| Shank Diameter d2 | 2.8 mm |
| Square Drive Size a | 2.2 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 35° flute works like a screw conveyor
The flutes of this tap spiral to the right at an angle of 35° to the axis. The tap rotates clockwise and advances into the hole. A 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 remains clean, and the cutting edges do not encounter compacted chips. The shank of the M2.5 x0.45 tap has a diameter of 2.8 mm and a square size of 2.2 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 0.45 mm/rev, equal to the pitch of the M2.5 x0.45 thread.
M2.5 spiral flute machine tap – compliant with ISO 529
The M2.5 spiral flute machine tap is a professional tool from Fra for producing miniature internal threads in blind holes. The 35° spiral flute design ensures efficient rearward chip evacuation, eliminating the risk of jamming during blind hole tapping. HSSE steel with 5% cobalt ensures a hardness of 65-67 HRC and thermal stability up to 650°C. The 6H tolerance in accordance with ISO 529 ensures international compatibility and dimensional repeatability. The tool is intended for manufacturers of electronics, precision mechanical components, and measuring equipment.
Key advantages of the M2.5 spiral flute machine tap
- 35° spiral flute geometry directs chips backward during cutting, which is essential when tapping blind holes without the risk of damaging the hole bottom
- Durability enhanced by the addition of 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of the tool's mechanical properties
- Tolerance class 6H precision in accordance with ISO 529 guarantees full thread interchangeability and compatibility with tools from global manufacturers
- 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 and automatic lathes
The M2.5 spiral flute tap is suitable for manufacturing 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 is compatible with standard mineral oil-based tapping lubricants and coolant emulsions.
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: 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 M2.5 HSSE spiral flute machine tap in accordance 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 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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