NORMAL ANGLES
(GOST 8908-81)

The table does not apply to angular dimensions cones. When choosing corners, the 1st row should be preferred to the 2nd, and the 2nd to the 3rd.

NORMAL TONES and CONE ANGLES
(GOST 8593-81)

The standard applies to the tapers and cone angles of smooth conical elements of parts.

Note. The taper or cone angle values indicated in the “Cone designation” column are taken as the initial values when calculating other values given in the table. When selecting tapers or taper angles, Row 1 should be preferred to Row 2.

TOOL CONES SHORTENED
(GOST 9953-82)

The standard applies to shortened tool Morse tapers.

*z - the greatest permissible deviation of the position of the main plane in which the diameter D is located from the theoretical position.
** dimensions for reference.

Designation cone	Cone Morse	D	D 1	d	d 1	l 1	l 2	a, no more	b	c
B7	0	7,067	7,2	6,5	6,8	11,0	14,0	3,0	3,0	0,5
B10 B12	1	10,094 12,065	10,3 12,2	9,4 11,1	9,8 11,5	14,5 18,5	18,0 22,0	3,5 3,5	3,5 3,5	1,0 1,0
B16 B18	2	15,733 17,780	16,8 18,0	14,5 16,2	15,0 16,8	24,0 32,0	29,0 37,0	5,0 5,0	4,0 4,0	1,5 1,5
B22 B24	3	21,793 23,825	22,0 24,1	19,8 21,3	20,5 22,0	40,5 50,5	45,5 55,5	5,0 5,0	4,5 4,5	2,0 2,0
B32	4	31,267	31,6	28,6	-	51,0	57,5	6,5	-	2,0
B45	5	44,399	44,7	41,0	-	64,5	71,0	6,5	-	2,0
Dimensions D 1 and d are theoretical, resulting respectively from the diameter D and the nominal dimensions a and l 1

TAPER OF OUTER AND INNER CONES
AND CONES WITH THREADED HOLE

INSTRUMENTAL MORSE AND METRIC EXTERNAL CONES
(GOST 25557-2006)

Type cone	Metric		Morse							Metric
Designation	4	6	0	1	2	3	4	5	6	80	100	120	160	200
D	4,0	6,0	9,045	9,065	17,78	23,825	31,267	44,399	63,348	80	100	120	160	200
D 1	4,1	6,2	9,2	12,2	18,0	24,1	31,6	44,7	63,8	80,4	100,5	120,6	160,8	201,0
d*	2,9	4,4	6,4	9,4	14,6	19,8	25,9	37,6	53,9	70,2	88,4	106,6	143	179,4
d 1	-	-	-	M6	M10	M12	M16	M20	M24	M30	M36	M36	M48	M48
d 4 max	2,5	4,0	6,0	9,0	14,0	19,0	25,0	35,7	51,0	67,0	85,0	102,0	138,0	174,0
l min	-	-	-	16,0	24,0	24,0	32,0	40,0	47,0	59,0	70,0	70,0	92,0	92,0
l 1	23,0	32,0	50,0	53,5	64,0	81,0	102,5	129,5	182,0	196,0	232,0	268,0	340,0	412,0
l 2	25,0	35,0	53,0	57,0	69,0	86,0	109,0	136,0	190,0	204,0	242,0	280,0	356,0	432,0
l 11	-	-	-	4,0	5,0	5,5	8,2	10,0	11,5	-	-	-	-	-
* - size for reference. - the angle of Morse cones No. 0-No. 5 corresponds to the angle of shortened Morse cones; No. 6 - 1:19.180 = 0.05214 - angle of metric cones - 1:20 = 0.05.

The profile of the threaded hole corresponds to the center hole shape R By GOST GOST 14034-74.

In GOST 25557-2006, all dimensions of the center hole are given in a general table. The standard also specifies the dimensions of the grooves and bores required to construct cones when cutting fluid (coolant) is supplied through the tool.

Depending on the design, the tool shank may have the corresponding designation:

B.I.- internal cone with groove;
BE- outer cone with foot;
A.I.- internal cone with a hole along the axis;
AE- outer cone with threaded hole along the axis;
BIK- internal cone with a groove and a hole for coolant supply;
VEC- outer cone with a foot and a hole for coolant supply;
AIK- internal cone with a hole along the axis and a hole for coolant supply;
AEK- outer cone with a threaded hole along the axis and a hole for coolant supply.

TOOL CONES MORSE AND METRIC INTERNAL
(GOST 25557-2006)

INTERNAL AND EXTERNAL CONES WITH TONE 7: 24
(GOST 15945-82)

Tolerances of internal and external tapers 7:24 according to GOST 19860-93.

TOOL CONES
Limit deviations of the cone angle and tolerances of the cone shape
(GOST 2848-75)

The degree of accuracy of instrumental cones is indicated by the tolerance of the cone angle of a given degree of accuracy according to GOST 8908-81 and is determined by the maximum deviations of the cone angle and the tolerances of the cone surface shape, numeric values which are listed below.

Notes:
1. Deviations of the cone angle from the nominal size are placed in “plus” - for external cones, in “minus” - for internal ones.
2. GOST 2848-75 for external cones also provides for accuracy levels AT4 and AT5. Tolerances in accordance with GOST 2848-75 apply to tool cones in accordance with GOST 25557-2006 and GOST 9953-82.

Example of designation of Morse cone 3, degree of accuracy AT8:

Morse 3 AT8 GOST 25557-2006

The same metric cone 160, accuracy degree AT7:

Meter. 160 AT7 GOST 25557-2006

The same shortened cone B18, accuracy degree AT6:

Morse B18 AT6 GOST 9953-82

TOOL SHANKS WITH CONE 7:24

Official publication

INTERSTATE COUNCIL FOR STANDARDIZATION. METROLOGY AND CERTIFICATION Minsk

Preface

1 DEVELOPED by Gosstandart of Russia

INTRODUCED by the Technical Secretariat of the Interstate Council for Standardization, Metrology and Certification

2 ADOPTED by the Interstate Council for Standardization,

3. The standard complies with the international standard ISO 297-88 regarding shank dimensions for 7:24 taper tools and is fully compliant with ISO 7388-1-83

Version 1

Maximum deviation of the position of the main plane.

/ - main flatness; 2 - tool mounting area

Dimensions for reference

Dimensions according to ISO 297-88. except for sizes.

Table 1

t. not Solee	L*»s ■eeee	no more

enclosed in brackets (see appendix)

Notes:

1. Dimensions in brackets for machines designed before 01/01/94.

2. Dimensions a, D 2, / apply to tools for which a clamp is provided on the front side of the flange.

3. Exit groove grinding wheel- according to GOST 8820. It is possible to manufacture shanks without a groove for the exit of the grinding wheel between the base diameter and the flange. In this case, the diameter of the cylindrical transition surface is D^=D ~o.5.

4. By agreement with the consumer, it is allowed to increase the size D t to values equal to the diameter outer surface spindle end according to GOST 30064-93.

* Maximum deviation of the position of the main plane.

** Dimensions determine the space for gripping the tool.

It. no less

Shank dimensions according to ISO 7388-1-83 (see appendix).

Notes:

1. The diameter of the cylindrical part /) 5 must satisfy the following relationship:

Between the base diameter and the flange, make a groove for the exit of the grinding wheel in depth according to GOST 8820. The groove width for cones 30 and 40 is 1.6 mm. for cones 45 and 50-3.0 mm;

Increasing the size / provided that the ratio is met; in this case, the grooves for a key of width b can be non-through with parallel sides with a length of at least / 44

Notes:

1. Groove for the exit of the grinding wheel - according to GOST 8820.

2. By agreement with the consumer, the following is allowed:

Between the base diameter and the flange, make a groove for the exit of the grinding wheel with a depth in accordance with GOST 8820, the width of the groove for cones 30 and 40 is 1.6 mm, for cones 45 and 50 - 3.0 mm;

Increasing the size / to a value not exceeding: /+L, while the grooves for a key of width b can be made non-through with parallel sides of a length not less than /;

Making a groove with size /a.

3. The dimensions and shape of the center hole must correspond to those indicated in the drawing. 4 and in table. 4.

4. Unspecified maximum deviations sizes: H14, Y4, IT 14

5. The degree of accuracy of cones AT4, AT5, tolerances of the angle and shape of the cone - according to GOST 19860. Place the deviation of the cone angle from the nominal in “plus”.

6. Surface hardness of the conical part of the shanks - 51 ... 57 HRC.

And execution.

Morse taper and metric taper

Morse taper is one of the most widely used tool mounts. It was proposed by Stephen A. Morse around 1864.

Morse taper is divided into eight sizes, from KM0 before KM7(English MT0-MT7, German MK0-MK7). Taper from 1:19.002 to 1:20.047 (cone angle from 2°51’26" to 3°00'52", cone slope from 1°25'43" to 1°30'26") depending on the size.

Metric cone

As the machine tool industry developed, it became necessary to expand the range of sizes of Morse cones, both larger and smaller. At the same time, for the new standard sizes of the cone, we chose a taper of exactly 1:20 (cone angle 2°51'51", cone slope 1°25'56") and called them metric cones(English Metric Taper). The standard size of metric cones is indicated by the largest diameter of the cone in millimeters. GOST 25557-2006 also defines reduced metric cones No. 4 and No. 6 (eng. ME4, ME6) and large metric cones No. 80, 100, 120, 160, 200 (eng. ME80 - ME200).

There are no design differences between the Morse taper and the metric taper.

Dimensions of the outer and inner cone (according to GOST 25557-2006), mm

Table 1

	Cone designation	Taper	D	D 1	d	d 1	d 2	d 3 max	d 4 max	d 5	l 1 max	l 2 max	l 3 max	l 4 max	l 5 min	l 6
Metric	№ 4	1:20	4	4,1	2,9	-	-	-	2,5	3	23	25	-	-	25	21
Metric	№ 6	1:20	6	6,2	4,4	-	-	-	4	4,6	32	35	-	-	34	29
Morse	KM0	1:19,212	9,045	9,2	6,4	-	6,1	6	6	6,7	50	53	56,3	59,5	52	49
	KM1	1:20,047	12,065	12,2	9,4	M6	9	8,7	9	9,7	53,5	57	62	65,5	56	52
	KM2	1:20,020	17,780	18	14,6	M10	14	13,5	14	14,9	64	69	75	80	67	62
	KM3	1:19,922	23,825	24,1	19,8	M12	19,1	18,5	19	20,2	80,1	86	94	99	84	78
	KM4	1:19,254	31,267	31,6	25,9	M16	25,2	25,2	24	26,5	102,5	109	117,5	124	107	98
	KM5	1:19,002	44,399	44,7	37,6	M20	36,5	35,7	35,7	38,2	129,5	136	149,5	156	135	125
	KM6	1:19,180	63,348	63,8	53,9	M24	52,4	51	51	54,6	182	190	210	218	188	177
	KM7	1:19,231	83,058					-					285.75	294.1
Metric	№ 80	1:20	80	80,4	70,2	M30	69	67	67	71,5	196	204	220	228	202	186
	№ 100	1:20	100	100,5	88,4	M36	87	85	85	90	232	242	260	270	240	220
	№ 120	1:20	120	120,6	106,6	M36	105	102	102	108,5	268	280	300	312	276	254
	№ 160	1:20	160	160,8	143	M48	141	138	138	145,5	340	356	380	396	350	321
	№ 200	1:20	200	201	179,4	M48	177	174	174	182,5	412	432	460	480	424	388

Shortened Morse tapers

For many applications, the length of the Morse cone turned out to be excessive. Therefore, nine standard sizes of shortened Morse cones were invented, obtained by removing the thicker part of the Morse cone. The number in the designation of a short cone is the diameter of the new thick part of the cone in mm. Russian standard for shortened cones GOST 9953-82 “Shortened tool cones. Main dimensions."

B7- shortened to 14 mm KM0.
B10, B12- shortened to 18 and 22 mm respectively KM1.
B16, B18- shortened to 24 and 32 mm respectively KM2.
B22, B24- shortened to 45 and 55 mm respectively KM3.
B32- shortened to 57 mm KM4.
B45- shortened to 71 mm KM5.

Morse taper is one of the most common means for securing a tool on a machine. Your name this tool received in honor of the famous engineer Stephen Morse, who lived in the 19th century. Today for the right choice Fractional numbers are used for the dimensions of this product. There are several standardized values, differing in angles of inclination and sizes.

The area of application of the Morse cone is mechanical engineering. With its help you can quickly and very accurately secure the cutting tool. To do this, the Morse taper is mounted in the machine in a special hole or chuck, and a drill, for example, is inserted into it. This fastening method guarantees the most accurate centering and subsequent processing. It can also be used to feed the workpiece or cutting tool cutting fluid.

Dimensions and elements of the Morse cone

The distinguishing feature of one Morse taper from another is its size. There are several types of them and, in accordance with GOST, each has a specific number and abbreviation. To measure it, you need to use a calibration, or best of all, a special table that will allow you to calculate dimensions down to the micron. Depending on the machine on which the part will be processed, you should choose, for example, a cutter, a drill, and then the type of invention of Stephen Morse.

With the development of the engineering industry, there was a need to expand model range Morse cones. For this purpose, a metric cone was developed, which did not have any special design differences from its predecessor. Its taper was 1:20, with an angle of 2°51’51″ and a slope of 1°25’56″. Metric cones made it possible to create big choice tools for various machines and operations. They are classified into two categories: large and small. Large ones are designated, for example, No. 120, 200, and the numbers correspond to the largest diameter of the metric cone.

A tool taper is a conical shank of a cutting tool and conical hole in a spindle or headstock of the same diameter. Its function is to quickly change cutting tools and maintain high precision when centering and clamping.

It is used mainly in CNC machines because it eliminates a number of disadvantages of a conventional Morse taper.

Advantages:

jamming of shanks in the spindle is much less;
smaller sizes;
improved axial stop;
ease of fastening;
automatic change of cutting tool.

Nowadays, Morse cones are manufactured in accordance with the international ISO and DIN standards. In Russia, the standardization system combines into one class both simple Morse cones, as well as metric and instrumental ones. Information about them can be obtained from GOST 25557-82. The situation with a single GOST has developed due to the fact that Morse cones have been very popular in our country since the times of the USSR, and in parallel with this, many new ones have appeared.

Download GOST 25557-82

Morse tapers are divided into 8 categories. Abroad these are MT0, MT1, MT2, MT3, MT4, MT5, MT6, MT7. In Germany the numbering is the same, but letter designation MK. In our country and in the post-Soviet space KM0, KM1, KM2, KM3, KM4, KM5, KM6 and No. 80.

As time has shown, some foreign-made Morse cones are inconvenient to use due to their large length. For this case, a series of shortened products has been developed, having 9 sizes.

The best varieties of cones today

These days, tool Morse tapers from HSK, Capto and Kennametal are especially popular due to their quality. Good resistance to temperature changes and compliance with stringent requirements in the machine tool industry have allowed Morse tapers of these brands to become market leaders.

HSK are hollow instruments with a taper of 1:10. They are designated by a letter of the Latin alphabet and a number indicating the larger diameter of the flange. Main feature Such products provide quick tool replacement, which is very important in CNC machines.

Capto tool tapers comply with the international ISO standard and are high quality products. The products are expensive due to the complexity of manufacturing, but high accuracy will allow minimizing defects in production when using these tools on machines. The design feature does not allow them to turn during operation of the machine; self-jamming occurs. The rigidity of the connection of Capto products is their main advantage over other competitors

Kennametal products are less common, but still do their job very well.

The products of B&S, Jacobs and Jarno are distributed mainly in the USA, as they do not have confirmation of international standards and are created, respectively, for the American market, where they are in great demand.

Bridgerport Machines has developed the R8 model for collet clamps on its equipment. But then the invention was finalized and released onto the international market. The effectiveness of this remedy caused a sensation at one time and all sorts of analogues began to appear. Today the company produces only one type of such mechanism.

The 7:24 tool taper is widely used in CNC machines, where tool change occurs automatically. Being instrumental, it has a number of advantages over conventional ones and that is why it is so popular in the machine tool industry. There are many varieties of it. Many countries have developed their own standards for it and therefore models 7:24 from different manufacturers do not replace each other.

The 1:50 cone is also widely used in the mechanical engineering industry, if it is necessary to additionally fasten two products with threaded connection. To do this, the 1:50 model has special pins that must be inserted into the workpieces, having previously drilled holes in the appropriate places.

Basic information about shanks and their designation

There are several types of execution tool cone. It may contain threads, a foot or do without them.

A thread can be cut at its end, which is made to secure the tool to the spindle using a pin. This is a special rod that prevents the tool from falling out. It can also be used to remove the product if it accidentally gets stuck in the spindle.

If the shank is made with a foot, then it holds the tool in the spindle due to the fact that it is secured in a special groove. The foot has two purposes: with its help it is easier to remove the product from the spindle, and it also creates a rigid fixation and there will be no turning.

You can also find a design with several grooves and holes. They have different depths and sizes. Their task is to supply cutting fluid to the cutting tool.

Tool shanks come in various designs and are designated letter code. Below is their transcript:

BI – internal, there is a groove;
BE – external, there is a foot;
AI – internal, there is a hole along the axis;
AE – external, there is a hole along the axis with a thread;
BIK – internal, there is a groove and a hole for feeding;
VEK – external, there is a foot and a hole for coolant supply;
AIK – internal, contains holes along the axis and for coolant supply;
AEK – external, contains an axial hole with a thread and a hole for coolant supply.

External and internal correspond to their names. Depending on the tool used, you should choose an external or internal version.

Shortened Morse tapers

In some situations, the dimensions of the Morse cone are too large and in this case you should use shortened options.

The names below indicate that the cone has been shortened:

B7 - up to 14 mm;
B10 - up to 18 mm;
B12 - up to 22 mm;
B16 - up to 24 mm;
B18 - up to 32 mm;
B22 - up to 45 mm;
B24 - up to 55 mm;
B32 - up to 57 mm;
B45 - up to 71 mm;

The number in the name informs about the size of the diameter of the new part of the cone. Detailed data can be taken from the relevant GOST.