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Description
Material HSSE
Thread size M4.5
ChamferB (3.5–5.5) threads
Standard DIN 371
Technical data for the M4.5 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M4.5 |
| Thread Pitch P | 0.75 mm |
| Overall Length l1 | 70 mm |
| Flute Length l2 | 7 mm |
| Length l3 | 25 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Size a | 4.9 mm |
| Tap Drill Diameter | 3.8 mm |
| Chamfer | B (3.5÷5.5) P |
| Thread tolerance | 6H |
How the type B through-hole chamfer pushes chips down the hole
Chips exit at the bottom instead of returning through the thread
The form B through-hole chamfer has a chip breaker at the front of the tap – an angled cut in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chip curls into a coil, breaks into short pieces, and exits the hole on the other side of the workpiece. Threads already cut remain clean because chips do not pass through them on their way up. The M4.5 x0.75 tap has a reinforced shank in accordance with DIN 371: diameter 6 mm, square 4.9 mm.
1
Straight flute – chips do not enter it; the flute carries lubricant to the cutting edges.
2
The chip breaker at the tip of the tap directs chips down the hole.
3
The tap rotates clockwise to cut a right-hand thread.
4
B chamfer: 3.5–5.5 incomplete threads on the entry taper.
5
The chips break into segments: individual pieces at the top of the hole, with progressively more farther down. They fall out below the workpiece.
6
Feed 0.75 mm/rev, equal to the pitch of the M4.5 x0.75 thread.
M4.5 machine tap for through holes – HSSE Gühring DIN 371
The Gühring M4.5 machine tap for through holes is a professional tool for cutting internal threads with a nonstandard diameter of 4.5 mm in applications requiring an intermediate size between M4 and M5. HSSE high-speed steel with 5% cobalt ensures a hardness of 65-67 HRC and optimum tool life when machining difficult-to-machine materials. As a world leader in cutting tool manufacturing, Gühring guarantees the highest manufacturing quality and geometric precision.
Why choose the Gühring M4.5 machine tap
- The Gühring brand as a world leader in cutting tool manufacturing, guarantees the highest manufacturing quality, geometric precision, and consistent performance
- Nonstandard M4.5 size fills the gap between the common M4 and M5 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 cutting edge life
- Short shank to DIN 371, compatible with ER11 and ER16 collet chucks and tapping chucks with axial compensation
- The 6H tolerance in accordance with DIN 371 ensures thread accuracy and full interchangeability with fasteners
- 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 Gühring M4.5 machine tap is used in toolrooms and prototype shops to produce 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 | 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 3.8 mm
3 Tapping
M4.5
✓ Done!
Tolerance 6H
Standard: DIN 371 | 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 M4.5 thread is used in special designs where standard M4 or M5 sizes do not provide the optimum strength-to-size ratio. It is found in optics, precision mechanics, and the aerospace industry.
The recommended tap drill diameter for the M4.5 thread is 3.7 mm. The M4.5 thread is a nonstandard size — verify size availability when ordering drill bits.
Gühring is a world leader in cutting tool manufacturing, offering the highest manufacturing quality, geometric precision, and consistent performance. Gühring taps are valued for their reliability and long service life.
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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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