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Description
Material HSSE
Thread size M7
ChamferB (3.5–5.5) threads
Standard DIN 371
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 |
| Length l3 | 30 mm |
| Shank Diameter d2 | 7 mm |
| Square Drive Size a | 5.5 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 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 M7 x1 tap has a reinforced shank in accordance with DIN 371: diameter 7 mm, square 5.5 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 through-hole machine tap – cobalt HSSE DIN 371
The M7 machine tap for through holes from the HSSE series is designed to cut M7 internal threads in through holes on CNC and conventional machine tools. M7 is a nonstandard thread size used in specialized applications where standard M6 or M8 sizes do not meet design requirements. High-speed steel 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 M7 machine tap for through holes
- Nonstandard M7 size fills the gap between the common M6 and M8 sizes, used in designs with specific strength requirements
- 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
- Short shank in accordance with DIN 371 compatible with ER16 and ER20 collet chucks, collets, and tapping chucks with axial compensation
- The 6H tolerance to DIN 371 ensures thread precision and full interchangeability with standard-class fasteners
- Material versatility covering structural steels up to 800 MPa, alloy steels, austenitic stainless steels, cast iron, and aluminum
- Metric pitch of 1 mm in accordance with DIN 13 for M7 coarse threads, with a recommended tap drill diameter of 6 mm
The M7 machine tap for through holes is used in toolrooms and prototype shops to produce components with specific strength requirements. Form B with straight flutes provides effective chip evacuation when tapping through holes. The tool requires cooling with an oil emulsion at a minimum concentration of 6-8%.
| 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 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 M7 thread is used in special designs where standard sizes M6 or M8 do not provide the optimum strength-to-size ratio. It is found in precision engineering and the aerospace industry.
The recommended tap drill diameter for the M7 thread is 6 mm. The M7 thread is a nonstandard size — verify size availability when ordering drill bits.
M7 is a nonstandard size, and fasteners may require a special order. Checking availability with industrial suppliers in advance is recommended.
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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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