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Description
Material HSSE
Thread size M4
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M4 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M4 |
| Thread Pitch P | 0.7 mm |
| Overall Length l1 | 63 mm |
| Flute Length l2 | 13 mm |
| Shank Diameter d2 | 2.8 mm |
| Square Drive Size a | 2.1 mm |
| Tap Drill Diameter | 3.3 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 type B through-hole chamfer has a chip breaker at the tip of the tap – an angled notch in the cutting edges. The chip breaker directs chips down the hole, ahead of the tap tip. The chips curl into a spring shape, break into short pieces and exit the hole on the other side of the workpiece. The threads already cut remain clean because the chips do not pass through them on their way up. The M4 x0.7 tap has a reduced shank to DIN 376: diameter 2.8 mm, square size 2.1 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 0.7 mm/rev, equal to the pitch of the M4 x0.7 thread.
M4 machine tap for through holes – HSSE with DIN 376 long shank
The M4 machine tap for through holes from the HSSE series is designed for cutting internal M4 threads in holes requiring increased clamping rigidity and better tool guidance. The long shank according to DIN 376 minimizes tool runout and improves thread quality in the popular M4 size. Its high-speed steel construction with 5% cobalt provides a hardness of 65-67 HRC and high heat resistance in the cutting zone up to 650°C.
Key features of the M4 machine tap with a long shank
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is essential when tapping deep holes and operating at high speeds
- HSSE steel with 5% cobalt guarantees a hardness of 65-67 HRC and thermal resistance up to 650°C, extending cutting edge life under intensive use
- Manufacturing precision to 6H tolerance guarantees dimensional repeatability and full thread interchangeability in series production
- Compatibility with ER16 and ER20 tool holders and tapping heads for CNC machining centers with synchronous tapping
- Designed for austenitic stainless steels 304/316 and ferritic stainless steels that require increased tool heat resistance
- Metric pitch of 0.7 mm in accordance with DIN 13 for M4 coarse threads, with a recommended tap drill diameter of 3.3 mm
The M4 machine tap with a long shank performs well in maintenance departments for thread restoration and repairs, and in toolrooms for producing precision components. Form B with straight flutes directs chips forward when tapping through holes. Cooling with an emulsion containing EP additives at a concentration of 8-10% is recommended.
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 398-1592 | 279-1114 |
| MStainless steel | 5-10 | 398-796 | 279-557 |
| KCast iron | 5-15 | 398-1194 | 279-836 |
| NAluminum | 10-25 | 796-1989 | 557-1392 |
Thread preparation M4 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 3.3 mm
3 Tapping
M4
✓ Done!
Tolerance 6H
Standard: DIN 376 | 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
DIN 371 specifies a short shank, while DIN 376 specifies a long shank. The long shank provides greater clamping rigidity and improved tool guidance, which is recommended for deep tapping on CNC centers.
The M4 DIN 376 tap requires tool holders with sufficient clamping depth for its long shank. It is compatible with ER16 and ER20 tool holders and tapping chucks with axial compensation.
The M4 DIN 376 tap with a long shank is recommended for tapping deep holes, high-speed operation on CNC centers and applications requiring minimal tool runout.
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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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