Through hole tap – Structural and annealed steels

Spiral point tap for through holes in structural and annealed steels: the chip is pushed forward. TiN, 12 – 15° rake.

ISO P

Through holes

TiN

M2 – M36

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Geometry by material

Chamfer, helix and rake chosen for the material

DIN 371 / 376 sizes

Metric, fine, pipe and inch, also custom made

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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	12 – 15°
Tool material	HSS-E (cobalt high-speed steel)
Coating	TiN (first choice) · alternatively steam oxide, TiCN, bright
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	Structural and annealed steelsISO P
Strength	up to 800 N/mm² (about 24 HRC)
Examples	S235, S355, normalised C15, C45, 11SMnPb37 and free-cutting steels, 16MnCr5 and 20MnCr5 case-hardening steels in the annealed condition

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 structural and annealed steels

Coating	When to choose it
TiN – titanium nitride ★	The universal coating: less friction and less sticking, longer life on structural steels and common materials.
Steam oxide (steam tempering)	Porous oxide layer that retains the lubricant and reduces cold welding: austenitic stainless steels and soft, "gummy" steels.
TiCN – titanium carbonitride	Harder and more abrasion-resistant than TiN: quenched and tempered steels, cast irons and series production.
Bright (uncoated)	The sharpest possible cutting edge: aluminium, copper and soft materials that do not tolerate rounded edges.

★ INNOT first choice for this material. Every tap can be supplied with any coating in the range: specify it in your request.

Starting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF

Cutting speed Vc	10 – 20 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	6 – 10 % emulsion or cutting oil

Thread	Spindle speed (n)
M6	530 – 1.060
M10	320 – 640
M16	200 – 400
M24	130 – 270

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.
On very soft steels (below 400 N/mm²) choose steam oxide: it prevents burrs and cold welding on the thread.
Chamfer the hole entry at 90°: clean start and no burr on the first thread.

Selection guide

Material

Through holes

Blind holes

Structural and annealed steelsup to 800 N/mm²

Spiral pointTiN 35° helixTiN

Quenched and tempered and alloy steels800 – 1400 N/mm²

Spiral pointTiCN 40° helixTiCN

Stainless steels450 – 1000 N/mm²

Spiral pointsteam oxide 35° – 40° helixsteam oxide

Cast irons and short chipsup to 300 HB

Straight flutesTiCN

Aluminium and light alloysSi up to 10 %

Spiral pointbright 45° helixbright

↻

Chiplesssteels, stainless steels, aluminium

Forming tapTiN · steam oxide · CrN

Fine, pipe, inch and left-hand threads: special and custom threads.

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