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Through hole tap – Stainless steels – INNOT technical drawing

Through hole tap – Stainless steels

Spiral point tap for through holes in stainless steels: the chip is pushed forward. Steam oxide, 8 – 10° rake.

ISO M

Through holes

steam oxide

M2 – M36

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Technical data sheet PDFCutting data, sizes and grades

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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

Through hole tapStainless steels · 450 – 1000 N/mm²INNOTISO M ringspiral point (gun nose)l threadL overall lengthchamferØ d1Ø d2square a3 flutesTHROUGH HOLEchip pushed forwardthrough holes up to 3×dsteam oxiderake 8 – 10°M2 – M36

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 8 – 10°
Tool material HSS-E; HSS-E-PM for series production
Coating steam oxide (first choice) · alternatively TiN, TiAlN, CrN
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 Stainless steelsISO M
Strength 450 – 1000 N/mm²
Examples AISI 303, 304 and 304L, 316 and 316L, 316Ti, 420, 430 and martensitic stainless steels

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 stainless steels

Coating When to choose it
Steam oxide (steam tempering) ★ Porous oxide layer that retains the lubricant and reduces cold welding: austenitic stainless steels and soft, "gummy" steels.
TiN – titanium nitride The universal coating: less friction and less sticking, longer life on structural steels and common materials.
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.
CrN – chromium nitride Anti-sticking surface: aluminium, copper, brass and titanium, where the chip tends to weld onto the thread.

★ 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 4 – 10 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 specific for stainless steel (preferable to emulsion)
Thread Spindle speed (n)
M6 210 – 530
M10 130 – 320
M16 80 – 200
M24 50 – 130

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.
  • Never dwell inside the hole: stainless steel work-hardens. Low, constant speed and oil specific for stainless steel.
  • Chamfer the hole entry at 90°: clean start and no burr on the first thread.

Selection guide

Material
Through holes
Blind holes
P
Structural and annealed steelsup to 800 N/mm²
Spiral pointTiN35° helixTiN
P
Quenched and tempered and alloy steels800 – 1400 N/mm²
Spiral pointTiCN40° helixTiCN
M
Stainless steels450 – 1000 N/mm²
Spiral pointsteam oxide35° – 40° helixsteam oxide
K
Cast irons and short chipsup to 300 HB
Straight flutesTiCN
N
Aluminium and light alloysSi up to 10 %
Spiral pointbright45° helixbright
↻
Chiplesssteels, stainless steels, aluminium
Forming tapTiN · steam oxide · CrN

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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