Forming tap – through and blind holes

Fluteless tap that cold-forms the thread without chips: stronger and ideal for blind holes in steels, stainless steels and aluminium.

ISO P

ISO M

ISO N

Chipless

Through and blind

Tol. 6HX

M2 – M16

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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

Technical support

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Description

Technical drawing

At a glance

Hole type	Through holes and blind holes, with the same tool
Process	Cold forming: the lobes of the tap displace the material and form the thread, without chips
Chamfer	Form C (2 – 3 threads) for blind holes, form D (3.5 – 5 threads) for through holes
Thread depth	Up to 2.5 × d
Advantages	Stronger thread (continuous grain flow and work-hardened surface), no chips to evacuate, longer tool life, excellent flank finish
Good to know	Higher torque than a cutting tap and a larger tap drill, to be made accurately
Tolerance	6HX (ISO 2); 6GX on request
Tool material	HSS-E; HSS-E-PM for alloy steels and series production
Design	Reinforced shank from M2 to M10 (DIN 371), reduced shank from M12 (DIN 376)

Materials

	Materials
Suitable	Structural, case-hardening and quenched and tempered steels up to 1200 N/mm², austenitic stainless steels, aluminium and alloys with Si up to 10 %, copper, long-chipping brass. An elongation at break of at least 8 – 10 % is required.
Not suitable	Grey cast iron, leaded brass and short-chipping bronze, die-cast aluminium with Si over 10 %, brittle materials: for these use the cast iron tap.

Sizes and tap drill

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

Thread	Pitch P	Tap drill Ø	L overall	l thread	Ø d2 shank	Square a
M2	0,4	1,8	45	8	2,8	2,1
M2,5	0,45	2,3	50	9	2,8	2,1
M3	0,5	2,8	56	11	3,5	2,7
M3,5	0,6	3,2	56	12	4	3
M4	0,7	3,7	63	13	4,5	3,4
M5	0,8	4,65	70	16	6	4,9
M6	1	5,55	80	19	6	4,9
M8	1,25	7,45	90	22	8	6,2
M10	1,5	9,35	100	24	10	8
M12	1,75	11,2	110	28	9	7
M14	2	13,1	110	30	11	9
M16	2	15,1	110	32	12	9

Dimensions in mm. The tap drill for a forming tap is larger than for cutting taps (about d − 0.45 × P): the crest height depends on the tap drill, so keep to the value in the table with a tight tolerance. Sizes above M16 on request.

Coatings by material

Material	Recommended coating	Guide Vc
Structural and annealed steels	TiN ★ · TiCN for series production	10 – 25 m/min
Quenched and tempered and alloy steels	TiCN ★ · AlCrN	8 – 15 m/min
Stainless steels	Steam oxide ★ · TiN	6 – 12 m/min
Aluminium, copper and long-chipping brass	CrN ★ · DLC	15 – 30 m/min

Tips for use

Lubrication is decisive: neat oil or a rich emulsion (at least 10 %), never dry.
In blind holes drill at least 2 – 3 pitches deeper than the thread: the displaced material needs room.
Check the torque of the machine or tapping head: about 50 % more is needed than with a cutting tap.
Chamfer the hole entry: forming raises a slight lip 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