GOST 12489-71 Solid countersinks. Design and dimensions

Some requirements that this tool must meet

The selected countersink (according to GOST or reference books, or both) must comply with the following technical conditions of use:

— In products made of structural steel, holes with a diameter of up to 8 centimeters are bored using high-speed steel equipment. Its diameter should reach 32-80 mm. The equipment must have attachment heads.

— If the product is made of non-ferrous metals or cast iron, a feather tool is used to bore blind holes.

— If the product was made of hardened steel, which was difficult to process, you need to use a tool with carbide plates to stretch the holes in this part, their diameter is about 14 mm-5 cm. And the tool should have 3-4 teeth.

Conical countersinks GOST 14953-80, DIN 334, DIN 335 and DIN 347 | Gamma-Pro

A countersink is a multi-blade cutting tool for machining cylindrical and conical holes in parts to increase their diameter, improve surface quality and accuracy.
Working with a countersink is called countersinking. Countersinking is a semi-finish cutting process. In our company you can order delivery or production, and also, if available in stock, purchase Conical Countersinks GOST 14953-80:

Type 1 - countersinks with 60° centering angle

Countersink designation
2353-0081	5	50	10
2353-0082	8	60	12

Type 2 - centering countersinks for center holes with apex angle of 60° without safety cone

Countersink designation
2353-0083	5,0	2,00	45	3,0
2353-0084	6,3	2,50	50	3,7
2353-0085	8,0	3,15	4,7
2353-0086	10,0	4,00	56	6,0
2353-0087	12,5	5,00	63	7,4
2353-0088	16,0	6,30	71	9,5

Type 3 - centering countersinks for center holes with an apex angle of 60° with a safety cone of 120°

Countersink designation
2357-0001	0,80	5,0	1,55	35,5	0,82
2357-0002	1,00	6,3	2,00	1,13
2357-0003	1,25	7,1	2,40	40,0	1,21
2357-0004	1,60	8,0	3,10	45,0	1,52
2357-0005	2,00	10,0	4,00	2,20
2357-0006	2,50	12,5	5,00	50,0	2,60
2357-0007	3,15	14,0	6,40	3,30
2357-0008	4,00	16,0	7,90	56,0	4,20
2357-0009	5,00	20,0	10,00	63,0	5,20
2357-0010	6,30	25,0	12,50	71,0	6,50

Type 4 - centering countersinks for center holes with apex angle of 75° without safety cone

Countersink designation
2353-0089	6,3	45	2,0	3,1
2353-0090	8,0	50	2,5	3,9

Type 5 - countersinks with apex angle of 60° with a cylindrical shank; Type 6 - countersinks with an apex angle of 90° with a cylindrical shank; Type 7 - 120° countersinks with cylindrical shank

Type 5 countersink designation	Type 6 countersink designation	Type 7 countersink designation
Type 5	Types 6, 7	Type 5	Types 6, 7
2353-0101	8,0	1,6	8	48	—	16	—
2353-0107	—	44	—	12
2353-0114
2353-0102	10,0	2,0	50	—	18	—
2353-0108	—	46	—	14
2353-0115
2353-0103	12,5	2,5	52	—	20	—
2353-0109	—	48	—	16
2353-0116
2353-0104	16,0	3,2	10	60	—	24	—
2353-0111	—	56	—	20
2353-0117
2353-0105	20,0	4,0	64	—	28	—
2353-0112	—	60	—	24
2353-0118
2353-0106	25,0	7,0	69	—	33	—
2353-0113	—	65	—	29
2353-0119

Type 8 - countersinks with apex angle of 60° with a tapered shank; Type 9 - countersinks with an apex angle of 75° with a tapered shank; Type 10 - countersinks with a 90° apex angle with a tapered shank; Type 11 - 120° countersinks with tapered shank

Type 8 countersink designation	Type 9 countersink designation	Type 10 countersink designation	Designation for countersink type 11							Morse cone
Type 8	Type 9	Types 10, 11	Type 8	Type 9	Types 10, 11
2353-0121	16,0	3,2	97	—	—	24	—	—	1
2353-0133	—	93	—	20
2353-0142
2353-0122	20,0	4,0	120	—	28	—	2
2353-0134	—	116	—	24
2353-0143
2353-0123	25,0	7,0	125	—	—	33	—	—	2
2353-0135	—	121	—	29
2353-0144
2353-0124	31,5	9,0; 7,0*	132	—	—	40	—	—
2353-0129	—	127	—	35
2353-0136	—	124	—	32
2353-0145
2353-0125	40,0	12,5; 11,0*	160	—	—	45	—	—	3
2353-0131	—	155	—	40
2353-0137	—	150	—	35
2553-0146
2353-0126	50,0	16,0	165	—	—	50	—	—
2353-0138	—	153	—	38
2353-0147
2353-0127	63,0	20; 18,0*	200	—	—	58	—	—	4
2353-0132	—	192	—	50
2353-0139	—	185	—	43
2353-0148
2353-0128	80,0	25,0	215	—	—	73	—	—
2353-0141	—	196	—	54
2353-0149

Conical countersinks according to DIN 334, DIN 335 and DIN 347:


Zenecre 60 deg. (DIN 334)
Diameter Max, mm	Shank diameter, mm	Length, mm	Diameter Min, mm
8	8,0	50,0	1,5
10	8,0	50,0	1,8
12,5	8,0	50,0	2,0
16	10,0	60,0	3,2
20	10,0	63,0	5,0
25	12,0	72,0	7,0
Countersink 90 deg. (DIN 335)
Diameter Max, mm	Shank diameter, mm	Length, mm	Diameter Min, mm
8	8,0	48,0	1,5
10	8,0	48,0	1,8
12,5	8,0	48,0	2,0
16	10,0	56,0	3,2
20	10,0	60,0	5,0
25	12,0	70,0	7,0
31,5	16,0	75,0	9,0
Countersink 120 deg. (DIN 347)
Diameter Max, mm	Shank diameter, mm	Length, mm	Diameter Min, mm
16	10	53	3,2

Countersink 90 deg.

Working range, mm	Diameter, mm	Shank diameter, mm	Length, mm
1…8	8,0	6,0	50,0
1…10	10,0	6,0	50,0
2…12	12,0	8,0	56,0
2…16	16,0	10,0	60,0
2…20	20,0	10,0	63,0
2…25	25,0	10,0	67,0
3…30	30,0	12,0	70,0
4…40	40,0	15,0	92,0
5…50	50,0	15,0	100,0

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The countersink is also selected depending on the task of processing the part.

- Conical. Parts for processing conical surfaces on steel workpieces (for various sensors, valves, etc.) and for working with other types of steel materials.

— End ones. They are used to ensure that the end planes of the part are protected.

- Cylindrical. Parts are manufactured according to special GOST standards. Countersinks of this type are intended for processing surfaces of various cylindrical types and shapes. They differ from each other in angle of inclination, diameter, and coating, which can be made of different surfaces, but they have one thing in common - they are made of wear-resistant material.

APPENDIX 1 (recommended)

APPENDIX 1 Recommended

CONSTRUCTION ELEMENTS AND GEOMETRICAL PARAMETERS OF COUNTERSINKERS

1. Structural elements and geometric parameters of countersinks with cylindrical and conical shanks are indicated in Figure 1 and Table 1, mounted ones - in Figure 2 and Table 2.

Damn.1. Type 1 and 3

Type 1 and 3

Damn.1

Table 1

10	5	3	1,2	0,4	1,0	0,8	0,5
10,75
11
11,75	4
12	6	1,5
12,75
13
13,75	7	5	2,0
14
14,75
15
15,75	8	6	0,6	1,2	1,2	1,0
16
16,75
17
17,75
18
18,70	9	7
19
19,70
20
20,70	2,5
21
21,70	10	8
22
22,70	3,0	0,7	1,5	1,5
23
23,70
24
24,70	11
25
25,70
26
27,70	12	9	1,5
28
29,70
30
31,60	13	10
32
33,60	14	3,5	0,8	1,8	1,8
34
34,60
35
35,60
36
37,60	15	11
38
39,60
40

Damn.2. Type 2

Type 2

Damn.2

table 2

32	2,5	1,5	4	7
32,6
33
33,6
34
34,6
35
35,6
36
36,6
37
37,6	8
38
38,6	5	9
39
39,6
40
41,6	3,0
42
43,6	10
44
44,6
45
45,6
46
46,6
47
47,6	3,5	6	11
48
49,6	2,0
50

2. The main dimensions of countersinks with intermediate diameters with a conical shank are indicated in Table 2a, mounted ones - in Table 2b, with a cylindrical shank - in Table 2c.

Table 2a

Morse cone
7.80 to 8.50	156	75	1
8,50 » 9,50	162	81
9,50 » 10,60	168	87
10,60 » 11,80	175	94
11,80 » 13,20	182	101
13,20 » 14,00	189	108
14,00 » 15,00	212	114	2
15,00 » 16,00	218	120
16,00 » 17,00	223	125
17,00 » 18,00	228	130
18,00 » 19,00	233	135
19,00 » 20,00	238	140
20,00 » 21,20	243	145
21,20 » 22,40	248	150
22,40 » 23,02	253	155
23,02 » 23,60	276	155	3
23,60 » 25,00	281	160
25,00 » 26,50	286	165
26,50 » 28,00	291	170
28,00 » 30,00	296	175
30,00 » 31,50	301	180
31,50 » 31,75	306	185
31,75 » 33,50	334	4
33,50 » 35,50	339	190
35,50 » 37,50	344	195
37,50 » 40,00	349	200
40,00 » 42,50	354	205
42,50 » 45,00	359	210
45,00 » 47,50	364	215
47,50 » 50,00	369	220

Note. The lengths and can vary within one diameter interval between the minimum and maximum values corresponding to those given in the table for the nearest lower and upper limits of the interval.

For example, for a diameter of 15 mm, the length can vary between 108 and 120 mm with a nominal value of 114 mm, with a tolerance of ±6 mm.

Since the length tolerance is the same as the length (±6 mm), the length can vary between 206 and 218 mm with a nominal value of 212 mm.

Table 2b

St. 23.6 to 35.5	1З	45
35,5 » 45,0	16	50
45,0 » 53,0	19	56
53,0 » 63,0	13	45
63,0 » 75,0	27	71
75,0 » 90,0	32	80
90,0 » 101,6	40	90

Note. Countersink dimensions comply with ISO 3314-75.

Table 2c

Up to 3.00	61	33
3.00 to 3.35	65	36
3,35 » 3,75	70	39
3,75 » 4,25	75	43
4,25 » 4,75	80	47
4,75 » 5,30	86	52
5,30 » 6,00	93	57
6,00 » 6,70	101	63
6,70 » 7,50	109	69
7,50 » 8,50	117	75
8,50 » 9,50	125	81
9,50 » 10,60	133	87
10,60 » 11,80	142	94
11,80 » 13,20	151	101
13,20 » 14,00	160	108
14,00 » 15,00	169	114
15,00 » 16,00	178	120
16,00 » 17,00	184	125
17,00 » 18,00	191	130
18,00 » 19,00	198	135
19,00 » 20,00	205	140

Note. The lengths and can vary within one diameter interval between the minimum and maximum values corresponding to those given in the table for the nearest lower and upper limits of the interval. For example, for a diameter of 4 mm, the length can vary from 39 to 47 mm with a nominal value of 43 mm and the length can vary from 70 to 80 mm with a nominal value of 75 mm.

(Introduced additionally, Amendment No. 3).

Section 1. (Changed edition, Amendment No. 4).

DIMENSIONS OF CUTTER PROFILE FOR MACHINING HELICAL GROOVES AND BACKS OF COUNTERSINK TEETH

2.1. Dimensions of the profile of cutters for processing helical grooves and backs of three-tooth countersinks in Figures 3 and 4 in Tables 3, 4, four-tooth countersinks - in Figure 5 and Table 5.

Damn.3

Table 3

For countersinks with diameter
until 11	5,10	2,31	—	3,00	0,25	1,00	5,10	3,80
11 » 12	6,75	3,17	0,14	3,84	—	1,60	6,75	5,48
12 » 14	6,90	3,23	4,20	7,45	1,44	2,00	6,90	8,50
14 » 15	7,85	3,78	3,65	7,50	1,46	2,25	7,85	8,65
15 » 16	9,00	3,60	2,65	7,10	1,25	2,00	9,00	8,05
16 » 17	8,20	4,46	4,75	9,25	2,23	2,35	8,20	10,20
17 » 18	8,20	3,98	4,80	8,70	1,48	2,45	8,20	10,10
18 » 19	9,30	4,86	5,85	10,60	3,82	2,8	9,30	10,10
19 » 21	8,25	4,51	5,55	10,05	2,33	2,40	8,25	10,40
21 » 23	9,65	4,97	6,80	11,80	3,13	2,80	9,65	11,95
23 » 25	12,65	5,33	8,40	13,00	3,70	4,00	12,65	13,65
25 » 27	15,70	5,88	4,40	12,45	0,70	3,00	15,70	15,05
27 » 30	14,00	6,92	7,50	15,05	3,09	3,65	14,00	16,35
30 » 36	17,00	7,92	0,31	9,61	—	4,00	17,00	13,67
36 » 40	18,87	8,79	0,34	10,65	—	4,44	18,87	15,17

2.2. It is permitted to manufacture countersinks with a chip flute profile different from the specified shape.

Damn.4

Table 4

Dimensions in mm

For countersinks with diameter	(prev. shutdown by )
10-11	10,6	7,4	5,0	20°
11,5-12	11,2	8,0	5,5
13	11,6	8,4	6,0
14	12,2	9,0	6,5
15	12,6	9,4	7,0
16	14,0	10,8	7,5
17	14,6	11,4	8,0
18	15,2	12,0	8,5
19	15,8	12,5	9,0
20	16,4	13,2	9,5
21	17,0	13,8	10,0
22	17,6	14,4	10,5
24	19,0	15,8	11,5
25	20,0	16,5	12,0
26	20,7	17,2	12,5
27	21,4	17,9	13,0
28	22,2	18,7	13,5
30	23,6	20,1	14,5
32	24,8	21,5	15,5	25°
34	26,5	23,0	16,5
35	27,2	23,7	17,0
36	27,9	24,4	17,5
37	28,7	25,2	18,0
38	29,4	25,9	18,5
40	39,5	29,5	19,5

Damn.5

Table 5

For countersinks of size	cutters
30 to 38	63	4,0	32	0,20	15,4	20,0
38 » 46	5,0	38	0,25	18,6	24,1
46 » 60	80	6,0	45	24,3	31,5
60 » 70	7,0	54	0,30	28,3	36,8
70 » 80	100	8,0	58	0,40	32,4	42,0

INSTALLATION OF GROOVE MILLS WHEN MILLING HELICAL GROOTS OF COUNTERSKINS

3.1. The installation diagram for groove cutters when milling helical grooves of countersinks is shown in Figure 6 and Table 6.

Damn.6

Table 6

Dimensions in mm

Countersink diameter	Number of grooves	Cutter diameter	Installation size
From 10 to 11.5	3	63	34,0	20°	-0,02
12	34,5	-0,02
13	80	43,0	-0,03
14	43,5
15
16	44,0	0,00
17	-0,11
18	-0,2…..*
19	44,5	-0,21
From 20 to 21	-0,21
22	45,0	-0,07
24	100	55,0	-0,33
25	55,5
From 26 to 27	-0,18
28 » 30	125	68,5	-0,22
32	69,0	-0,12
From 34 to 36	69,5	0,00
37 » 40	70,0	0,00
33	4	63	39,3	15°	10,65
34	40,1	11,10
35	40,6	11,50
36	41,60	11,60
37	41,50	11,74
38	41,90	11,89
40	41,40	12,90
42	42,20	13,60
45	43,60	14,50
48	80	50,95	16,20
50	52,75	16,65
52	52,75	17,55
55	54,10	17,85
58	55,60	18,15
60	56,65	18,75
62	55,20	20,60
63	56,10	20,50
65	57,00	20,80
68	58,20	21,40
70	59,40	22,20
72	100	68,20	23,60
75	69,60	23,60
78	71,40	24,80
80	71,40	25,40

________________ * Defect of the original. — Note.

Section 2, 3. (Changed edition, Amendment No. 3).