Maschio per ghisa – fori passanti e ciechi INNOT
Cast iron tap – through and blind holes – INNOT technical drawing

Cast iron tap – through and blind holes

Straight flute tap for cast irons and short-chipping materials, in through and blind holes. Broken chips, TiCN against abrasion.

ISO K

ISO N

Through and blind

TiCN

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

Cast iron tapCast irons and short-chipping materials · up to 300 HBINNOTISO K/ISO N ringstraight flutesl threadL overall lengthchamferØ d1Ø d2square a4 flutesTHROUGH AND BLINDshort, broken chipsthrough and blindTiCNrake 3 – 5°M2 – M36

At a glance

Hole type Through holes and blind holes
Geometry Straight flutes · 4 straight flutes
Chamfer Form C, 2 – 3 threads
Chip Short and broken: stays in the flutes or comes out as powder
Thread depth Up to 2.5 × d
Rake angle 3 – 5°
Tool material HSS-E; solid carbide on request for high-volume production
Coating TiCN (first choice) · alternatively nitrided, TiN
Tolerance 6H (6HX on request); 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 Cast irons and short-chipping materialsISO KISO N
Strength up to 300 HB
Examples grey cast iron EN-GJL (GG20 – GG30), ductile cast iron EN-GJS (GGG40 – GGG60), malleable cast iron; also die-cast aluminium with Si over 10 % and short-chipping brass

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 cast irons

Coating When to choose it
TiCN – titanium carbonitride ★ Harder and more abrasion-resistant than TiN: quenched and tempered steels, cast irons and series production.
Nitriding Treatment that hardens the tool surface: cast irons and abrasive short-chipping materials.
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

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
Cutting speed Vc 8 – 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 Emulsion; grey cast iron also dry with extraction
Thread Spindle speed (n)
M6 420 – 1.060
M10 250 – 640
M16 160 – 400
M24 110 – 270

Guide values to be adapted to machine, clamping and lubrication. n = Vc × 1000 / (π × d).

Tips for use

  • Straight flutes retain the broken chips: in deep blind holes blow out or clean the hole between parts.
  • Grey cast iron also dry with dust extraction; on ductile iron use emulsion.
  • Also suitable for die-cast aluminium with silicon over 10 % and for short-chipping brass.
  • Check the tap drill: in cast iron a hole that is too small tears the thread flanks.
  • 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.

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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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