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Description
Material HSSE
Thread size M7
ChamferB (3.5–5.5) threads
Standard DIN 376
Technical data for the M7 machine tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M7 |
| Thread Pitch P | 1 mm |
| Overall Length l1 | 80 mm |
| Flute Length l2 | 18 mm |
| Shank Diameter d2 | 6 mm |
| Square Drive Size a | 4.9 mm |
| Tap Drill Diameter | 6 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 M7 x1 tap has a reduced shank to DIN 376: diameter 6 mm, square size 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 1 mm/rev, equal to the pitch of the M7 x1 thread.
M7 machine tap for through holes – Narex HSSE with a long shank to DIN 376
The Narex M7 machine tap for through holes is a professional tool for cutting M7 internal threads in holes requiring increased clamping rigidity. The long shank according to DIN 376 minimizes tool runout and improves thread quality in the nonstandard M7 size. HSSE high-speed steel construction with 5% cobalt provides a hardness of 65-67 HRC and high heat resistance up to 650°C in the cutting zone.
Why choose the Narex M7 machine tap with a long shank
- The Narex brand as a renowned cutting tool manufacturer with a long tradition, guarantees the highest manufacturing quality and consistent performance
- Nonstandard M7 size fills the gap between the common M6 and M8 sizes in designs with specific requirements
- Long shank to DIN 376 provides greater clamping rigidity and improved tool guidance, which is important when tapping deep holes
- HSSE steel with 5% cobalt ensures a hardness of 65-67 HRC and heat resistance up to 650°C, extending cutting edge life
- Compatibility with ER16 and ER20 tool holders and tapping heads for CNC machining centers with synchronous tapping
- Metric pitch of 1 mm in accordance with DIN 13 for M7 coarse threads, with a recommended tap drill diameter of 6 mm
The Narex M7 machine tap with a long shank is suitable for toolrooms and prototype shops producing components with specific strength requirements. Form B with straight flutes directs chips forward. 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 | 227-909 | 227-909 |
| MStainless steel | 5-10 | 227-455 | 227-455 |
| KCast iron | 5-15 | 227-682 | 227-682 |
| NAluminum | 10-25 | 455-1137 | 455-1137 |
Thread preparation M7 in a through hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 6 mm
3 Tapping
M7
✓ 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.
Narex is a reputable manufacturer with a long tradition, offering tools with consistent quality and repeatable geometric specifications. Narex taps offer good value for money.
Yes, M6, M7 and M8 coarse threads all have a pitch of 1 mm according to DIN 13. They differ only in nominal diameter and tap drill diameter.
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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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