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Description
Material HSSE
Thread size M11
ChamferC (2–3) threads
Standard DIN 376
Technical data for the M11 blind-hole tap
| Technical Data | |
|---|---|
| Nominal Diameter d1 | M11 |
| Thread Pitch P | 1.5 mm |
| Helix Angle | 35° |
| Overall Length l1 | 100 mm |
| Flute Length l2 | 22 mm |
| Length l3 | 39 mm |
| Shank Diameter d2 | 8 mm |
| Square Drive Size a | 6.2 mm |
| Tap Drill Diameter | 9.5 mm |
| Chamfer | C (2÷3) P |
| Thread tolerance | 6H |
How a spiral flute tap evacuates chips from a blind hole
The 35° flute works like a screw conveyor
The flutes of this tap follow a right-hand helix at an angle of 35° 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 M11 x1.5 tap has a reduced shank according to DIN 376: diameter 8 mm, square size 6.2 mm.
1
The 35° 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 1.5 mm/rev, equal to the pitch of the M11 x1.5 thread.
M11 spiral-flute machine tap – for blind holes
The M11 spiral flute machine tap is a professional Narex tool for cutting M11 internal threads in blind holes up to 2.5D deep. The 35° spiral flute design efficiently evacuates chips backward, eliminating the risk of jamming during blind-hole tapping. HSSE steel with 5% added cobalt guarantees a hardness of 65-67 HRC and thermal stability up to 650°C. The long shank in accordance with DIN 376 increases clamping rigidity in machine tool holders. Tolerance 6H ensures the dimensional repeatability required in series production.
Key advantages of the M11 spiral flute machine tap
- Compliance with DIN 376 confirms manufacturing quality and ensures standardized long-shank dimensions compatible with European machine tool holders
- Designed for industrial pneumatics includes valve bodies, pneumatic cylinders, directional control valves, and pressure system components
- Tolerance class 6H precision guarantees full thread interchangeability and dimensional repeatability in series production of mechanical components
- Durability of HSSE steel with 5% cobalt allows operation at temperatures up to 650°C in the cutting zone without loss of mechanical properties
- Form C chamfer for blind holes allows tapping close to the bottom of the hole with a minimal incomplete thread length of 2-3 pitches
- Compatibility with ER25 and ER32 tool holders and tapping chucks with axial compensation for CNC machining centers
The M11 spiral flute tap is used to produce special threads in industrial pneumatics and fittings. Cooling with an oil emulsion at a minimum concentration of 8% or with tapping oil extends tool life by a factor of 2-3. The tap drill diameter for the M11 thread is 9.5 mm for the standard pitch of 1.5 mm.
Cutting data for the M11 blind-hole machine tap
| Material | Cutting speed Vc [m/min] | Spindle speed n [rpm] | Feed f [mm/min] |
|---|---|---|---|
| PSteel | 5-20 | 145-579 | 218-868 |
| MStainless steel | 5-10 | 145-289 | 218-434 |
| KCast iron | 5-15 | 145-434 | 218-651 |
| NAluminum | 10-25 | 289-723 | 434-1084 |
Thread preparation M11 in a blind hole
1 Spot drilling
NC spotting drill 90°
2 Drilling
Ø 9.5 mm
3 Tapping
M11
✓ 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 Narex M11 HSSE spiral flute machine tap is suitable for structural steels up to 900 MPa, 304/316 austenitic stainless steels, aluminum, and brass. The M11 size is used in industrial pneumatics and special fittings.
For the M11x1.5 thread in tolerance class 6H, the recommended tap drill diameter is 9.5 mm. The hole tolerance range should be within 9.5 to 9.7 mm. Exceeding the upper limit results in an incomplete thread profile and a lower tolerance class.
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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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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