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Description
Material HSS
Thread size M4.5
ChamferB (3.5–5.5) threads
Standard DIN 352
Technical data for the M4.5 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M4.5 |
| Thread Pitch P | 0.75 mm |
| Overall Length l1 | 50 mm |
| Flute Length l2 | 15 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Size a | 4.9 mm |
| Tap Drill Diameter | 3.7 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
M4.5 machine tap for through holes – economical HSS with 7H tolerance
The HSS tap series for professional toolrooms includes the M4.5 machine tap for through holes in an economical high-speed steel version with a wider 7H tolerance. HSS steel with a hardness of 62-65 HRC provides good tool life when machining soft and medium-hard materials with a tensile strength up to 800 MPa. The 7H tolerance provides slightly greater clearance in the threaded joint, facilitating assembly and making it preferable in some applications.
Technical data for the M4.5 HSS 7H machine tap
- Wider 7H tolerance provides slightly greater clearance in the threaded joint than the standard 6H tolerance, facilitating assembly and making it preferable in some applications
- Economical HSS steel with a hardness of 62-65 HRC, offers good value for money when machining standard materials
- Nonstandard M4.5 size fills the gap between the common M4 and M5 sizes in designs with specific requirements
- Compliance with DIN 352 confirms manufacturing quality and ensures standardized dimensions for nonstandard threads
- Intended for soft materials including structural steels up to 800 MPa, gray cast iron, and aluminum — not recommended for stainless steels
- Metric pitch of 0.75 mm in accordance with DIN 13 for M4.5 coarse threads, with a recommended tap drill diameter of 3.7 mm
The M4.5 HSS 7H machine tap is used in applications where slightly greater clearance in the threaded joint is preferred or where tooling costs are an important factor. Form B with straight flutes directs chips forward. Cooling with an oil emulsion at a concentration of 5-8% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 354-1415 | 266-1061 |
| MStainless steel | 5-10 | 354-707 | 266-530 |
| KCast iron | 5-15 | 354-1061 | 266-796 |
| NAluminum | 10-25 | 707-1768 | 530-1326 |
Thread preparation M4.5 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 3.7 mm
3 Tapping
M4.5
✓ 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 7H tolerance provides slightly greater clearance in the threaded joint than the standard 6H tolerance. A 7H thread is preferred in applications requiring easy assembly or where greater clearance is acceptable.
HSS steel without added cobalt is not optimal for stainless steels due to its lower heat resistance. An HSSE tap with 5% cobalt is recommended for stainless steels.
The recommended tap drill diameter for the M4.5 thread is 3.7 mm, regardless of whether the thread tolerance is 6H or 7H. The hole diameter does not change with the tolerance.
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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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