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Description
Material HSSE
Thread size M3.5
ChamferB (3.5–5.5) threads
Standard DIN 352
Technical data for the M3.5 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M3.5 |
| Thread Pitch P | 0.6 mm |
| Overall Length l1 | 45 mm |
| Flute Length l2 | 14 mm |
| Shank Diameter d2 | 4 mm |
| Square Drive Size a | 3 mm |
| Tap Drill Diameter | 2.9 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
M3.5 machine tap for through holes – Fra HSSE compliant with DIN 352
The M3.5 machine tap for through holes from manufacturer Fra is designed for precision tapping of holes with a nonstandard diameter of 3.5 mm. Made from HSSE high-speed steel with 5% cobalt, it guarantees a hardness of 65-67 HRC and optimum tool life when machining materials with a strength of up to 800 MPa. Its design in accordance with DIN 352 ensures standardized dimensions and the 6H thread tolerance class required in the manufacture of precision components. The M3.5 thread is used in special applications where standard M3 or M4 sizes do not meet requirements.
Technical specifications of the Fra M3.5 machine tap
- Manufacturer Fra as a specialist in special-purpose taps, guarantees high manufacturing quality and accurate nonstandard thread geometry
- Nonstandard M3.5 size fills the gap between the common M3 and M4 sizes, which is important in designs with specific requirements
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and heat resistance up to 650°C, extending service life
- Compliance with DIN 352 confirms manufacturing quality and ensures standardized dimensions for nonstandard threads
- Compatibility with ER16 holders and collets for precise clamping on CNC machining centers
- Metric pitch of 0.6 mm compliant with DIN 13 for M3.5 coarse threads, the recommended tap drill diameter is 2.9 mm
The Fra M3.5 machine tap is used in toolrooms and prototype shops to manufacture components with specific strength requirements. Form B with straight flutes directs chips forward when tapping through holes. The tool requires cooling with an oil emulsion at a concentration of 6-8%.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 455-1819 | 273-1091 |
| MStainless steel | 5-10 | 455-909 | 273-545 |
| KCast iron | 5-15 | 455-1364 | 273-818 |
| NAluminum | 10-25 | 909-2274 | 545-1364 |
Thread preparation M3.5 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 2.9 mm
3 Tapping
M3.5
✓ Done!
Tolerance 6H
Standard: DIN 352 | Chamfer: B (straight) | Application: through 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 M3.5 thread is used in special designs where standard M3 or M4 sizes do not provide the optimum strength-to-size ratio. It is found in the aerospace industry, optics, and precision engineering.
The recommended tap drill diameter for the M3.5 thread is 2.9 mm. The M3.5 thread is a nonstandard size — verify size availability when ordering drill bits.
Yes, the M3.5 HSSE tap with 5% cobalt is suitable for machining austenitic stainless steels 304/316. Generous cooling with an emulsion containing EP additives at a concentration of 8-10% is recommended.
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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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