Through hole tap – Quenched and tempered, alloy and tool steels
Spiral point tap for through holes in quenched and tempered and alloy steels: the chip is pushed forward. TiCN, 10 – 12° rake.
ISO P
Through holes
TiCN
M2 – M36
Technical data sheet PDFCutting data, sizes and grades
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Description
Technical drawing
At a glance
| Hole type | Through holes |
| Geometry | Spiral point (gun nose) · 3 shallow straight flutes: strong core |
| Chamfer | Form B, 3.5 – 5 threads |
| Chip | Pushed forward, it exits from the bottom of the hole |
| Thread depth | Up to 3 × d (beyond: long version on request) |
| Rake angle | 10 – 12° |
| Tool material | Vanadium HSS-E or HSS-E-PM (powder-metallurgy high-speed steel) |
| Coating | TiCN (first choice) · alternatively AlCrN, TiAlN, TiN |
| Tolerance | 6H; 6G and 7G for threads to be galvanised or painted |
| Design | Reinforced shank from M2 to M10 (DIN 371), reduced shank from M12 (DIN 376); from M3 to M10 also with reduced shank for deep holes |
| Cutting direction | Right-hand; left-hand on request |
Workpiece materials
| Group | Quenched and tempered, alloy and tool steelsISO P |
| Strength | 800 – 1200 N/mm² (up to 1400 N/mm² with powder-metallurgy substrate) |
| Examples | 42CrMo4, 39NiCrMo3, 34CrNiMo6, 40CrMnMo7 (1.2311), mould and tool steels in the annealed condition (1.2379, 1.2343) |
Sizes – ISO metric thread
| Thread | Pitch P | Tap drill Ø | L overall | l thread | Ø d2 shank | Square a |
|---|---|---|---|---|---|---|
| M2 | 0,4 | 1,6 | 45 | 8 | 2,8 | 2,1 |
| M2,5 | 0,45 | 2,05 | 50 | 9 | 2,8 | 2,1 |
| M3 | 0,5 | 2,5 | 56 | 11 | 3,5 | 2,7 |
| M3,5 | 0,6 | 2,9 | 56 | 12 | 4 | 3 |
| M4 | 0,7 | 3,3 | 63 | 13 | 4,5 | 3,4 |
| M5 | 0,8 | 4,2 | 70 | 16 | 6 | 4,9 |
| M6 | 1 | 5 | 80 | 19 | 6 | 4,9 |
| M8 | 1,25 | 6,8 | 90 | 22 | 8 | 6,2 |
| M10 | 1,5 | 8,5 | 100 | 24 | 10 | 8 |
| M12 | 1,75 | 10,2 | 110 | 28 | 9 | 7 |
| M14 | 2 | 12 | 110 | 30 | 11 | 9 |
| M16 | 2 | 14 | 110 | 32 | 12 | 9 |
| M18 | 2,5 | 15,5 | 125 | 34 | 14 | 11 |
| M20 | 2,5 | 17,5 | 140 | 34 | 16 | 12 |
| M22 | 2,5 | 19,5 | 140 | 34 | 18 | 14,5 |
| M24 | 3 | 21 | 160 | 38 | 18 | 14,5 |
| M27 | 3 | 24 | 160 | 38 | 20 | 16 |
| M30 | 3,5 | 26,5 | 180 | 45 | 22 | 18 |
| M33 | 3,5 | 29,5 | 180 | 50 | 25 | 20 |
| M36 | 4 | 32 | 200 | 56 | 28 | 22 |
Dimensions in mm. M39 to M100 and fine, pipe and inch threads on request. The tap drill Ø is the one recommended for tolerance 6H.
Coatings for quenched and tempered and alloy steels
| Coating | When to choose it |
|---|---|
| TiCN – titanium carbonitride ★ | Harder and more abrasion-resistant than TiN: quenched and tempered steels, cast irons and series production. |
| AlCrN – aluminium chromium nitride | Very high hot hardness with good toughness: quenched and tempered and tool steels up to 1400 N/mm², series tapping. |
| TiAlN / AlTiN – titanium aluminium nitride | Withstands high temperatures at the cutting edge: higher speeds, minimum quantity lubrication (MQL) or dry, alloy steels and stainless steels on powder-metallurgy substrate. |
| TiN – titanium nitride | The universal coating: less friction and less sticking, longer life on structural steels and common materials. |
★ INNOT first choice for this material. Every tap can be supplied with any coating in the range: specify it in your request.
Starting data
| Cutting speed Vc | 6 – 12 m/min (lower value for uncoated substrate or machines with a compensating chuck) |
| Feed | Equal to the thread pitch: synchronised tapping or chuck with axial compensation |
| Lubrication | Cutting oil or rich emulsion (10 – 12 %) |
| Thread | Spindle speed (n) |
|---|---|
| M6 | 320 – 640 |
| M10 | 190 – 380 |
| M16 | 120 – 240 |
| M24 | 80 – 160 |
Guide values to be adapted to machine, clamping and lubrication. n = Vc × 1000 / (π × d).
Tips for use
- The chip exits ahead of the tap: leave free space under the part so it can fall without jamming.
- The long chamfer spreads the cut over more teeth and lasts longer: do not use this tap in blind holes.
- Above 1200 N/mm² choose the HSS-E-PM substrate with AlCrN or TiCN and start from the lowest Vc value.
- Chamfer the hole entry at 90°: clean start and no burr on the first thread.
Selection guide
Fine, pipe, inch and left-hand threads: special and custom threads.
Need a different tap?
Thread, tolerance, length, substrate and coating: tell us the material, hole type and depth and we will propose the right tap with a quote within 30 minutes.
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