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Description
Material HSSE
Thread size M9
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M9 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M9 |
| Thread Pitch P | 1.25 mm |
| Helix Angle | 40° |
| Overall Length l1 | 90 mm |
| Flute Length l2 | 20 mm |
| Length l3 | 35 mm |
| Shank Diameter d2 | 9 mm |
| Square Drive Size a | 7 mm |
| Tap Drill Diameter | 7.8 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 40° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 40° to the axis. The tap rotates clockwise and advances into the hole. Chips cut by the chamfer enter the flute, and the helix carries them upward like the screw in a meat grinder. The bottom of the hole stays clean, and the cutting edges do not encounter packed chips. The M9 x1.25 tap has a reduced shank according to DIN 376: diameter 9 mm, square size 7 mm.
1
The 40° spiral flute carries chips upward from the chamfer.
2
The stepped chip exits the hole and breaks into short pieces.
3
The tap rotates clockwise to cut a right-hand thread.
4
Chamfer C: 2–3 incomplete threads on the tapered lead.
5
Clearance below the tap tip – min. 2 thread pitches above the bottom.
6
Feed 1.25 mm/rev, equal to the pitch of the M9 x1.25 thread.
M9 spiral-flute machine tap – for blind holes
In this range, Fra offers an M9 spiral flute machine tap with a long shank for producing special threads with a diameter of 9 mm. Made of HSSE steel with 5% cobalt, the tool meets DIN 376 requirements and provides a hardness of 65-67 HRC. The 40° spiral flute ensures aggressive chip evacuation when tapping blind holes. The form C chamfer allows tapping close to the bottom of a blind hole, leaving a minimum incomplete thread length of 2-3 threads.
Advantages and applications of the M9 spiral flute machine tap
- Compatibility with ER16 and ER25 tool holders and tapping chucks with axial compensation for CNC machining centers and automatic lathes
- Tolerance class 6H precision in accordance with DIN 376 guarantees the dimensional repeatability required in series production of precision components
- Designed for special threads covers components with nonstandard diameters required in the machinery industry and special equipment
- Conforms to DIN 376 for long-shank taps provides greater reach and clamping rigidity in deep holes
- Durability of HSSE steel allows machining of structural steels up to 900 MPa, stainless steels, and aluminum and copper alloys
- 40° geometry with form C provides aggressive chip evacuation when tapping blind holes to a depth of 2.5D
The M9 machine tap is used in machinery manufacturing and the production of special equipment requiring threads with a nonstandard diameter. The standard pitch of the M9 thread is 1.25 mm, with a tap drill diameter of 7.8 mm. The tool is compatible with standard mineral oil-based tapping lubricants and coolant emulsions.
Cutting data for the M9 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 177-707 | 221-884 |
| MStainless steel | 5-10 | 177-354 | 221-442 |
| KCast iron | 5-15 | 177-531 | 221-664 |
| NAluminum | 10-25 | 354-884 | 442-1105 |
Thread preparation M9 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 7.8 mm
3 Tapping
M9
✓ Done!
Tolerance 6H
Standard: DIN 376 | Chamfer: C (spiral flute) | Application: blind 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 M9 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, stainless steels, aluminum and brass. The M9 size is used in industrial pneumatics and special fittings requiring nonstandard threads.
For an M9x1.25 thread of tolerance class 6H, the recommended tap drill diameter is 7.8 mm. The hole tolerance range should be 7.8 to 7.95 mm. Exceeding the upper limit results in an incomplete thread profile.
Yes, cooling with an oil emulsion of at least 8% or with tapping oil is recommended and extends tool life by a factor of 2-3. Intensive cooling is required when machining stainless steels, while aluminum can be tapped with minimum quantity lubrication (MQL).
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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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