GOST 6111-52 Conical inch thread with a profile angle of 60°

Holes

GOST provides holes for threads with coarse pitch <1 =

1.0 - 2.2 mm.

26. Dimensions and maximum deviations of the diameters of holes in threads with fine pitch.

Dimensions, mm

Nominal thread diameter d	Thread pitch P	Threaded hole diameter with tolerance range
		4Н5Н; 5H; 5Н6Н; 6H; 7N	6G; 7G	4Н5Н; 5H	5Н6Н; 6H; 6G	7H; 7G
		Denomination		Deviations
2,5 3 3,5	0,35	2,15 2,65 3,15	2,17 2,67 3,17	+0,05	+0,07	—
4 4,5 5 5,5	0,5	3,50 4,00 4,50 5,00	3,52 4,02 4,52 5,02	+0,08	+0,10	+0,14
6	0,5 0,75	5,50 5,20	5,52 5,23	+0,08 +0,11	+0,10 +0,17	+0,14 +0,22
8	0,5 0,75 1	7,50 7,20 6,95	7,52 7,23 7,00	+0,08 +0,11 +0,17	+0,10 +0,17 +0,20	+0,14 +0,22 +0,26
10	0,5 0,75 1 1,25	9,50 9,20 8,95 8,70	9,53 9,23 9,00 8,75	+0,08 +0,11 +0,17 +0,17	+0,10 +0,17 +0,20 +0,20	+0,14 +0,22 +0,26 +0,26
12	0,5 0,75 1 1,25 1,5	11,50 11,20 10,99 10,70 10,43	11,52 11,23 11,00 10,75 10,50	+0,08 +0,11 +0,17 +0,17 +0,19	+0,10 +0,17 +0,17 +0,20 +0,22	+0,14 +0,22 +0,26 +0,26 +0,30
14	0,5 0,75 1 1,25 1,5	13,50 13,20 12,95 12,70 12,43	13,52 13,23 13,00 12,75 12,50	+0,08 +0,11 +0,17 +0,17 +0,19	+0,10 +0,17 +0,20 +0,20 +0,22	+0,14 +0,22 +0,26 +0,26 +0,30
16	0,5 0,75 1 1,5	15,50 15,20 14,95 14,43	15,52 15,23 15,00 14,50	+0,08 +0,11 +0,17 +0,19	+0,10 +0,17 +0,20 +0,22	+0,14 +0,22 +0,26 +0,30
18	0,5 0,75 1 1,5 2	17,50 17,20 16,95 16,43 15,90	17,52 17,23 17,00 16,50 15,95	+0,08 +0,11 +0,17 +0,19 +0,24	+0,10 +0,17 +0,20 +0,22 +0,30	+0,14 +0,22 +0,26 +0,30 +0,40
20	0,5 0,75 1 1,5 2	19,50 19,20 18,95 18,43 17,90	19,52 19,23 19,00 18,50 17,95	+0,08 +0,11 +0,17 +0,19 +0,24	+0,10 +0,17 +0,20 +0,22 +0,30	+0,14 +0,22 +0,26 +0,30 +0,40
22	0,5 0,75 1 1,5 2	21,50 21,20 20,95 20,43 19,90	21,52 21,23 21,00 20,50 19,95	+0,08 +0,11 +0,17 +0,19 +0,24	+0,10 +0,17 +0,20 +0,22 +0,30	+0,14 +0,22 +0,26 +0,30 +0,40
24	0,75 1 1,5 2	23,20 22,95 22,43 21,90	23,23 23,00 22,50 21,95	+0,11 +0,17 +0,19 +0,24	+0,17 +0,20 +0,22 +0,30	+0,22 +0,26 +0,30 +0,40
27	0,75 1 1,5 2	26,20 25,95 25.43 24,90	26,23 26,00 25,50 24,95	+0,11 +0,17 +0,19 +0,24	+0,17 +0,20 +0,22 +0,30	+0,22 +0,22 +0,30 +0,40
30	0,75 1 1,5 2 3	29,20 28,95 28,43 27,90 26,85	29,23 29,00 28,50 27,95 26,90	+0,11 +0,17 +0,19 +0,24 +0,30	+0,17 +0,20 +0,22 +0,30 +0,40	+0,22 +0,26 +0,30 +0,40 +0,53
33	0,75 1 1,5 2 3	32,20 31,95 31,43 30,90 29,85	32,23 32,00 31,50 30,95 29,90	+0,11 +0,17 +0,19 +0,24 +0,30	+0,17 +0,20 +0,22 +0,30 +0,40	+0,22 +0,26 +0,30 +0,40 +0,53
36	1 1,5 2 3	34,95 34,43 33,90 32,85	35,00 34,50 33,95 32,90	+0,17 +0,19 +0,24 +0,30	+0,20 +0,22 +0,30 +0,40	+0,26 +0,30 +0,40 +0,53
39	1 1,5 2 3	37,95 37,43 36,90 35,85	38,00 37,50 36,95 35,90	+0,17 +0,19 +0,24 +0,30	+0,20 +0,22 +0,30 +0,40	+0,26 +0,30 +0,40 +0,53
42	1 1,5 2 3 4	40,95 40,43 39,90 38,85 37,80	41,00 40,50 39,95 38,90 37,85	+0,17 +0,19 +0,24 +0,30 +0,36	+0,20 +0,22 +0,30 +0,40 +0,48	+0,26 +0,30 +0,40 +0,53 +0,62
45	1 1,5 2 3 4	43,95 43,43 42,90 41,85 40,80	44,00 43,50 42,95 41,90 40,85	+0,17 +0,19 +0,24 +0,30 +0,36	+0,20 +0,22 +0,30 +0,40 +0,48	+0,26 +0,30 +0,40 +0,53 +0,62

GOST provides holes for threads with D = 1.0 - 200 mm and for c1

3rd row. GOST provides a method for determining the diameters of holes for cutting metric threads for materials of high viscosity.

27. Diameters of holes for cutting inch conical threads with a profile angle of 60° according to GOST 6111-52

The dimensions of the holes for threading apply to metals and alloys that do not have high viscosity.

Dimensions, mm

With cone deployment

Without cone deployment

Thread size, inches	Number of steps per 1″	Thread pitch P	Internal thread diameter d1	Diameter of hole with reaming to cone				Drilling depth L	Hole diameter without taper
				dc		do
				Denomination	Deviations	Denomination	Deviations		Denomination	Deviations
1/16 1/8	27	0,941	6,389 8,766	6,00 8,30	+0,16 +0,20	6,39 8,76	+0,09	13 14	6,3 8,7	+0,14
1/4 3/8	18	1,411	11,314 14,797	10,70 14,25	+0,24	11,31 14,80	+0,13	20 21	11,2 14,7	+0,24
1/2 3/4	14	1,814	18,321 23,666	17,50 22,90	+0,28	18,32 23,66	+0,17	26,5	18,25 23,50	+0,24 +0,28
1 11/4	111/2	2,209	29,694 38,451	28,75 37,43	+0,28 +0,34	29,69 38,45		33,5 34,5	29,6 38,5	+0,28 +0,34
11/8			44,520	43,50	+0,34	44,52		34,5	44,5	+0,34

28. Diameters of holes for cutting cylindrical pipe threads (according to GOST 21348-75)

Diameters of holes for cutting cylindrical pipe threads in accordance with GOST 6357-81 in products made of steel in accordance with GOST 380-94, GOST 4543-71, GOST 1050-88 and GOST 5632-72 (except for nickel-based alloys) and copper in accordance with GOST 859-78 .

Nominal thread size, inches	Number of steps per 1″	Step	Threaded hole diameter			Nominal thread size, inches	Number of steps per 1″	Step	Diameter of threaded hole
			Denomination	Deviations for accuracy classes					Denomination	Deviations for accuracy classes
				A	IN

A

B 1/8 28 0.907 8.62 +0.10 +0.20 4/21 21/223/43 31/431/233/44 41/25 51/26 11 2.309 62.80 72.27 78.62 84 .97 91.07 97.42 103.77 110.12 122.82 135.52 148.22 160.92 +0.22 +0.43 1/4 3/8 19 1.337 11.50 15.00 +0 .12 +0.25 1/2 5/8 3/4 7/8 14 1.814 18.68 20.64 24.17 27.93 +0.14+0.28 1 11/8 11/413/811/ 213/4 2 11 2.309 30.34 35.00 39.00 41.41 44.90 50.84 56.70 +0.18+0.36

Diameter of hole for GOST thread (Table)

The reference tables contain the dimensions of the diameters of holes for threading according to GOST 9150-59, GOST 6357-52, GOST 6111-52 and GOST 6211-52

1. The tables are for reference, issued on the basis of the plant’s guidelines 01.2РМ31-65 and normals МН5384-5389-64 and are intended for foremen, technologists and workers of main and auxiliary production.

2. The sizes of holes for threads with large pitches are highlighted in bold text.

3. The diameter of holes indicated without tolerances is carried out according to class 4 accuracy.

Diameters of holes for threading according to GOST 9150-59

Nominal thread diameter	Diameters of holes for threading according to GOST 9150-59
	Thread pitches S
	0,2	0,25	0,3	0,35	0,4	0,45	0,5	0,6	0,7	0,75	0,8	1	1,25	1,5
1	0,8	0,75
1,4	1,1
1,6	1,25
2,0	1,75	1,6
2,5	2,15	2,05
3	2,65	2,5
3,5	3,15	2,9
4	3,5	3,3
4,5	4	3,8
5	4,5	4,2
6	5,5	5,2	5
8	7,5	7,2	7	6,7
10	9,5	9,2	9	8,7	8,5

Nominal thread diameter	Diameter of holes for threading according to GOST 9150-59
	Thread pitches S
	0,75	1	1,25	1,5	1,75	2	2,5	3	3,5	4
12	11,2	11	10,7	10,5	10,2
14	13,2	13	12,7	12,5	11.9A5
16	15,25	15	14,5	14
18	17	16,5	16	15.35A5
20	18,95	18,45	18	17.35A5
22	20,95	20,45	20	19.35A5
24	22,45	21.85A5	20.85A5
27	25,45	25	23.85A5
30	28,45	28	26.85A5
33	29.85A5	29.35A5
36	32.8A5	31.8A5
39	34.8A5

Nominal thread diameter	Diameters of holes for threading according to GOST 9150-59
	Thread pitches S
	1	1,5	2	3	4	4,5	5	5,5	6
42	40,95	40,45	—	38,9	37.8A5	37,ZA5	—	—	—
45	43,95	43,45	42,95	41,9	40.8A5	40,ZA5	—	—	—
48	46,95	46,45	45,95	44,9	43.8A5	42.8A5	—	—
52	50,43	45,95	48,9	47.8A5	—	46.8A5	—	—
56	54,43	53,9	52,9	51,9	—	—	50,ZA5	—
60	58,4	57,9	56,9	55,9	—	—	54,ZA5	—
64	62,4	61,9	60,9	59,9	—	—	—	57.8A5
68	66,4	65,9	64,9	63,9	—	—	—	61.8A5
72	70,4	69,9	68,9	67,9	—	—	—	65.8A5	‘
76	74,4	73,9	72,9	71,9	—	—	—	69.8A5
80	78,4	77,9	76,9	75,9	—	—	—	73.8A5
85	83,4	82,9	81,9	80,9	—	—	—	78.8A5
90	88,4	87,9	86,9	85,9	—	—	—	83.75A5

For metals of high viscosity / (aluminum-magnesium alloys)
Nominal thread diameter	Diameter for holes for threading according to GOST 9150-59
	Thread pitches S
	0,25	0,3	0,35	0,4	0,45	0,5	0,6	0,7	0,8	1	1,25	1,5	1,75	2
1	0,8
1,4	1.15
1,6	1,3
2	1,65
2,5	2,15
3	2,6
3,5	3
4	3,35
5	4,25
6	5,1
8	6,8
10	8,6
12	10,8	10,6
14	12,6	12,1

Diameters of holes for cutting cylindrical pipe threads according to GOST 6357-52

Diameters of holes for cutting cylindrical pipe threads according to GOST 6357-52
Thread designation, inches	drill diameter, mm
	thread accuracy class
	2	3
1/8	8.65A4	8.7A5
1/4	11.5A4	11.5A5
3/8	15A4	15A5
1/2	18.7A,	18.7A5
5/8	20,7+0,12	20.7A5
3/4	24,2+0,15	24.2A5
7/8	28+0,12	28A5
1	30,43+0,16	30,43+0,29
1·1/8	35A4	35A5
1·1/4	39A4	39A5
1·3/8	—	41.5A5
1·1/2	—	45A5

Diameters of holes for threading according to OST NKTP 1260

Diameters of holes for cutting inch threads according to OST NKTP 1260
Thread designation, inches	Drill diameter, mm	Thread designation, inches	Drill diameter, mm
3/16	3,6	1	22
1/4	5	1·1/8	24,75
5/16	6,4	1·1/4	27,75
3/8	7,8	1·3/8	30,25
7/16	9,1	1·1/2	33,5
1/2	10,4	1·5/8	35,75
9/16	12	1·3/8	39
5/8	13,3	1·7/8	41,5
3/4	16,25	2	44,5
7/8	19,25

Hole diameter GOST 6111-52

Diameter of holes for cutting inch conical threads with reaming to a cone, GOST 6111-52
Thread diameter	Number of threads per 1″	dc	do	Drill depth. e mm
1/8	27	8,ZA5	8.76A4	15
1/4	18	10.7A5	11.31A4	20
3/8		14.25A5	14.8A4	22
1/2	14	17.5A5	18.32A4	28
3/4		22.9A5	23.66A4	28
1	11·1/2	28.75A5	29.69A4	35
1·1/4		37.43A5	38.45A4	36
1·1/2		43.5A5	44.52A4	36
2		55.5A4	56.54A4	37

Hole diameter GOST 6211-52

Diameter of holes for cutting conical pipe threads with reaming to a cone, GOST 6211-52
Thread diameter	Number of threads per 1″	dc	d°	I'll drill the depth. e mm
1/8	28	8.1A5	8.57A4	15
1/4	19	10.8A5	11.45A4	20
3/8		14.25A5	14,95+0,1	24
1/2	14	17.9A5	18,63+0,1	29
3/4		23.25A5	24,12+0,1	31
1	11	29.25A5	30.30А3а	37
1·1/4		37.75A5	38.95A3a	40
1·1/2		43.5A5	44.83A3a	42
2		55A5	56.54A3a	44

Source of information: PA “Mashzavod im. October Revolution" 1986.

II. TOLERANCES

2. The pipe thread (external) is checked according to the average diameter with a thread ring gauge in accordance with GOST 6485. The axial displacement of the main plane of the pipe (Fig. 2) relative to the nominal location should not exceed (thread pitch).

Figure 2 - Pipe thread (external)

3. The coupling thread (internal) is checked according to the average diameter with a thread plug gauge in accordance with GOST 6485. The axial displacement of the main plane of the coupling (Fig. 3) relative to the nominal location should not exceed (thread pitch).

Fig.3 - Coupling thread (internal)

(Changed edition, Amendment No. 1, 2).

4. The difference in sizes must be no less than the difference between the nominal sizes and indicated in Table 1.

5. The deviation of the distances between the tops and bottoms of the threads of the tube and coupling from the line of the average diameter of the thread (and according to Figure 4) should not exceed those given in Table 2.

table 2

Thread size designation

Figure 4 - Deviation of the distances between the tops and bottoms of the tube and coupling threads from the line of the average diameter of the thread

Damn.4

(Changed edition, Amendment No. 2).

6. Deviations of half the profile angle, slope angle () and deviation in thread pitch (deviations of the distances between any turns) should not exceed those given in Table 3.

Table 3

Thread size designation	Prev. off
half profile angle	slope angle		by thread pitch
for external thread	for internal thread	at a length of up to 10 mm	at the length of St. 10 mm

CONICAL INCH THREAD WITH PROFILE ANGLE 60°

GOST 6111-52

USSR STATE COMMITTEE ON STANDARDS

STATE STANDARD OF THE USSR UNION

Approved by the Office for Standardization under the Council of Ministers of the USSR on January 10, 1952. The introduction date is set

from 01.10.52
Tested in 1984
Failure to comply with the standard is punishable by law

This standard applies to threaded connections of fuel, oil, water and air pipelines of machines and machine tools. Note. 1. In pipelines made of steel water and gas pipes in accordance with GOST 3262-75, connections with conical threads must be made in accordance with GOST 6211-81. 2. (Deleted, Amendment No. 2).

1. The profile and dimensions of a conical inch thread with a profile angle of 60° must correspond to the drawings. 1 and table. 1.

Table 1

Designation, thread size

Number of threads per 1¢¢

Size in mm

Thread pitch

Thread length

thread diameter in the main plane

Internal diameter of thread at the end of the pipe

Working coil height

from the end of the pipe to the main plane

outer

interior

d 2 = D 2

d = D

d 1 = D 1

Notes: 1. When screwing together without interference a pipe and a coupling with nominal thread sizes, the main plane of the pipe thread coincides with the end of the coupling. 2. Size d T
is for reference.
3. Instead of a 1/16 ¢ ¢ thread, it is allowed to use an M6 ´ 1 conical thread in accordance with GOST 19853-74. 4. The number of turns with a full profile in a threaded connection should not be less than two. 5. It is allowed to reduce the size l
2 (the distance from the main plane to the end of the pipe), while the requirement of clause 4 of this standard regarding the difference in sizes
l
1
- l
2 must be met.

The thread pitch is measured parallel to the thread axis.

The bisector of the profile angle is perpendicular to the thread axis.

Symbol for tapered thread 3/

4 ¢ ¢
:
TO

3
/
4 ¢ ¢
GOST 6111-52 (Changed edition, Amendment No. 2).
2. The pipe thread (external thread) is checked by the average diameter with a thread ring gauge in accordance with GOST 6485-69.
The axial displacement of the main plane of the pipe D l
2 (Fig. 2) relative to the nominal location should not exceed
±P
(thread pitch).

Crap.
2 (Changed edition, Amendment No. 1, 2).
3. The coupling thread (internal thread) is checked according to the average diameter using a thread plug gauge in accordance with GOST 6485-69.
The axial displacement of the main plane of the coupling D l
2 (Fig. 3) relative to the nominal location should not exceed
±P
(thread pitch).
(Changed edition, Amendment No. 1, 2).
4. The difference in sizes
l
1 -
l
2 must be no less than the difference indicated in the table.
1 nominal sizes l
1 and
l
2 .5.
The deviation of the distances between the tops and bottoms of the tube and coupling threads from the line of the average thread diameter (d h
1 and d
h
2 according to Fig. 4) should not exceed:

table 2

Thread size designation	h 1 = h 2 = 1 / 2 H 1	d h 1 = d h 2
1/16 and 1/8¢¢
1/4 and 3/8¢¢
1/2 and ¾ ¢ ¢

INTERSTATE STANDARD

Date of introduction 01.10.52

This standard applies to threaded connections of fuel, oil, water and air pipelines of machines and machine tools.

Notes.

1. In pipelines made of steel water and gas pipes in accordance with GOST 3262, connections with conical threads must be made in accordance with GOST 6211-81.

2. (Deleted, Amendment No. 2).

GOST 6111-52

STATE STANDARD OF THE USSR UNION

CONICAL INCH THREAD WITH PROFILE ANGLE 60°

GOST 6111-52

USSR STATE COMMITTEE ON STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

CONICAL INCH THREAD WITH PROFILE ANGLE 60°

GOST 6111-52* Instead of OST 20010-38

Approved by the Office for Standardization under the Council of Ministers of the USSR on January 10, 1952. The introduction date is set

from 01.10.52

Tested in 1984

Failure to comply with the standard is punishable by law

This standard applies to threaded connections of fuel, oil, water and air pipelines of machines and machine tools.

Note.

1. In pipelines made of steel water and gas pipes in accordance with GOST 3262-75, connections with conical threads must be made in accordance with GOST 6211-81.

2. (Deleted, Amendment No. 2).

I. DIMENSIONS

1. The profile and dimensions of a conical inch thread with a profile angle of 60° must correspond to the drawings. 1 and table. 1.

Table 1

Designation, thread size	Number of threads per 1¢¢	Size in mm
		Thread pitch	Thread length		thread diameter in the main plane			Internal diameter of thread at the end of the pipe	Working coil height
			working	from the end of the pipe to the main plane
					average	outer	interior
inches	n	R	l 1	l 2	d 2= D 2	d = D	d 1= D 1	d T	H
1/16	27	0,941	6,5	4,064	7,142	7,895	6,389	6,135	0,753
1/8	27	0,941	7,0	4,572	9,519	10,272	8,766	8,480	0,753
¼	18	1,411	9,5	5,080	12,443	13,572	11,314	10,997	1,129
3/8	18	1,411	10,5	6,096	15,926	17,055	14,797	14,416	1,129
½	14	1,814	13,5	8,128	19,772	21,223	18,321	17,813	1,451
¾	14	1,814	14,0	8,611	25,117	26,568	23,666	23,128	1,451
1	11½	2,209	17,5	10,160	31,461	33,228	29,694	29,059	1,767
1¼	11½	2,209	18,0	10,668	40,218	41,985	38,451	37,784	1,767
1½	11½	2,209	18,5	10,668	46,287	48,054	44,520	43,853	1,767
2	11½	2,209	19,0	11,074	58,325	60,092	56,558	55,866	1,767

Notes:

1. When screwing together without tension a pipe and a coupling with nominal thread sizes, the main plane of the pipe thread coincides with the end of the coupling.

2. Size d T

reference.

3. Instead of a 1/16¢¢ thread, it is allowed to use an M6´1 conical thread in accordance with GOST 19853-74.

4. The number of turns with a full profile in a threaded connection should not be less than two.

5. It is allowed to reduce the size l

l
1
- l
must be met .

Crap. 1

The thread pitch is measured parallel to the thread axis.

The bisector of the profile angle is perpendicular to the thread axis.

Symbol for tapered thread 3/

4¢¢
:
TO

3
/
4¢¢
GOST 6111-52
(Changed edition, Amendment No. 2).

II. TOLERANCES

2. The pipe thread (external thread) is checked by the average diameter with a thread ring gauge in accordance with GOST 6485-69. Axial displacement of the main plane of the pipe D l

2 (Fig. 2) relative to the nominal location should not exceed
±P
(thread pitch).

Crap. 2

(Changed edition, Amendment No. 1, 2).

3. The coupling thread (internal thread) is checked according to the average diameter using a thread plug gauge in accordance with GOST 6485-69. Axial displacement of the main plane of the coupling D l

2 (Fig. 3) relative to the nominal location should not exceed
±P
(thread pitch).

Crap. 3

(Changed edition, Amendment No. 1, 2).

4. Size difference l

1-
l
2 should be no less than the difference indicated in the table.
1 nominal sizes l
1 and
l
2.

5. Deviation of the distances between the tops and bottoms of the tube and coupling threads from the line of the average thread diameter (d h

1 and d
h
2 according to devil. 4) must not exceed:

table 2

Thread size designation	h 1= h 2=1/2 H 1	dh 1=d h 2
	mm
1/16 and 1/8¢¢	0,3765	-0,045
1/4 and 3/8¢¢	0,5645	-0,065
1/2 and ¾¢¢	0,7255	-0,085
1 — 2¢¢	0,8835	-0,085

Crap. 4

(Changed edition, Amendment No. 2).

6. Deviations of half the profile angle, slope angle (j/2) and deviation in thread pitch (deviations in the distances between any turns) should not exceed:

Table 3

Thread size designation inches	Maximum deviation
	half profile angle	slope angle		by thread pitch
		for external thread	for internal thread	at a length of up to 10 mm	at the length of St. 10 mm
				mm
1/16 and 1/8¢¢	±1°	+12¢	-12¢	±0,02	±0,04
		-6¢	+6¢
1/4 — 2¢¢	±45¢	+10¢	-10¢
		-5¢	+5¢

(Changed edition, Amendment No. 1, 2).

MAIN DIMENSIONS

2.1. The designation of thread size, pitches and nominal values ​​of the main dimensions of conical (external and internal) threads must correspond to those indicated in the drawing. 2 and in table. 2.

l

1
—
working thread length;

l

2 - the length of the external thread from the end to the main plane.

Crap. 2

table 2

Dimensions in mm

Thread size designation	Step P	Thread diameters in the main plane			Thread length
		d = D	d 2 = D 2	d 1 = D 1	l 1	l 2
1/16	0,907	7,723	7,142	6,561	6,5	4,0
1/8		9,728	9,147	8,566
1/4	1,337	13,157	12,301	11,445	9,7	6,0
3/8		16,662	15,806	14,950	10,1	6,4
1/2	1,814	20,955	19,793	18,631	13,2	8,2
3/4		26,441	25,279	24,117	14,5	9,5
1	2,309	33,249	31,770	30,291	16,8	10,4
11/4		41,910	40,431	38,952	19,1	12,7
11/2		47,803	46,324	44,845
2		59,614	58,135	56,656	23,4	15,9
21/2		75,184	73,705	72,226	26,7	17,5
3		87,884	86,405	84,926	29,8	20,6
31/2		100,330	98,851	97,372	31,4	22,2
4		113,030	111,551	110,072	35,8	25,4
5		138,430	136,951	135,472	40,1	28,6
6		163,830	162,351	160,872

Shorter thread lengths may be used.

2.2. Numerical values ​​of diameters d

2 and
d
1 are calculated using the following formulas

d

2 =
D
2 =
d
- 0.640327
P
, ()

d

1 =
D
1 =
d
- 1.280654
P
. ()

Numerical values ​​of diameter d

established empirically.

2.3. Difference between actual dimensions l

1 -
l
2 must be no less than the difference between the nominal sizes
l
1 and
l
2 indicated in table. 2.

2.4. The length of the internal tapered thread must be at least 0.8 ( l

1 - D1
l
2), where D1
l
2 - in accordance with table. 3.

2.5. The designation of thread sizes, pitches and nominal values ​​of the outer, middle and inner diameters of the internal cylindrical thread must correspond to those indicated in the drawing. 3 and in table. 2.

2.6. The design of parts with internal threads (conical and cylindrical) must ensure screwing in of external conical threads to a depth of at least ( l

1 + D1
l
2).

Crap. 3

Not Found

INTERSTATE STANDARD

CONICAL INCH THREAD WITH PROFILE ANGLE 60°

GOST 6111-52*

Date of introduction 01.10.52

This standard applies to threaded connections of fuel, oil, water and air pipelines of machines and machine tools.

Note.

1. In pipelines made of steel water and gas pipes in accordance with GOST 3262-75, connections with conical threads must be made in accordance with GOST 6211-81.

2. (Deleted, Amendment No. 2).

1. The profile and dimensions of a conical inch thread with a profile angle of 60° must correspond to the drawings. 1 and table. 1.

Crap. 1

The thread pitch is measured parallel to the thread axis.

The bisector of the profile angle is perpendicular to the thread axis.

Example of symbol for tapered thread 3/

4¢¢
:
K

3
/
4¢¢
GOST 6111-52
(Changed edition, Amendment No. 2).

Table 1

Dimensions in millimeters

Designation, thread size, inches	Number of threads per 1¢¢ n	Thread pitch R	Thread length		Thread diameter in the main plane			Internal diameter of thread at the end of the pipe dT	Working coil height H
			working l 1	from the end of the pipe to the main plane l 2	average d 2= D 2	outer d = D	interior d 1= D 1
1/16	27	0,941	6,5	4,064	7,142	7,895	6,389	6,135	0,753
1/8			7,0	4,572	9,519	10,272	8,766	8,480
¼	18	1,411	9,5	5,080	12,443	13,572	11,314	10,997	1,129
3/8			10,5	6,096	15,926	17,055	14,797	14,416
½	14	1,814	13,5	8,128	19,772	21,223	18,321	17,813	1,451
¾			14,0	8,611	25,117	26,568	23,666	23,128
1	11½	2,209	17,5	10,160	31,461	33,228	29,694	29,059	1,767
1¼			18,0	10,668	40,218	41,985	38,451	37,784
1½			18,5		46,287	48,054	44,520	43,853
2			19,0	11,074	58,325	60,092	56,558	55,866

Notes:

1. When screwing together without tension a pipe and a coupling with nominal thread sizes, the main plane of the pipe thread coincides with the end of the coupling.

2. dT

reference.

3. Instead of a 1/16¢¢ thread, it is allowed to use an M6´1 conical thread in accordance with GOST 19853-74.

4. The number of turns with a full profile in a threaded connection should not be less than two.

5. It is allowed to reduce the size l

l
1
- l
must be met .

2. The pipe thread (external thread) is checked by the average diameter with a thread ring gauge in accordance with GOST 6485-69. Axial displacement of the main plane of the pipe D l

2 (Fig. 2) relative to the nominal location should not exceed
±P
(thread pitch).

Crap. 2

(Changed edition, Amendment No. 1, 2).

3. The coupling thread (internal thread) is checked according to the average diameter using a thread plug gauge in accordance with GOST 6485-69. Axial displacement of the main plane of the coupling D l

2 (Fig. 3) relative to the nominal location should not exceed
±P
(thread pitch).

Crap. 3

(Changed edition, Amendment No. 1, 2).

4. Size difference l

1-
l
2 should be no less than the difference indicated in the table.
1 nominal sizes l
1 and
l
2.

5. Deviation of the distances between the tops and bottoms of the tube and coupling threads from the line of the average thread diameter (d h

1 and d
h
2 according to devil. 4) must not exceed:

table 2

Thread size designation	h 1= h 2=1/2 H 1	dh 1=d h 2
	mm
1/16 and 1/8¢¢	0,3765	-0,045
1/4 and 3/8¢¢	0,5645	-0,065
1/2 and ¾¢¢	0,7255	-0,085
1 — 2¢¢	0,8835

Crap. 4

(Changed edition, Amendment No. 2).

6. Deviations of half the profile angle, slope angle (j/2) and deviation in thread pitch (deviations in the distances between any turns) should not exceed those given in table. 3.

Table 3

Thread size designation inches	Maximum deviation
	half profile angle	slope angle		by thread pitch
		for external thread	for internal thread	at a length of up to 10 mm	at the length of St. 10 mm
				mm
1/16¢¢ and 1/8¢¢	±1°	+12¢	-12¢	±0,02	±0,04
		-6¢	+6¢
¼¢¢ – 2¢¢	±45¢	+10¢	-10¢
		-5¢	+5¢

(Changed edition, Amendment No. 1, 2).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool Industry

2. APPROVED AND ENTERED INTO EFFECT by the Office for Standardization under the Council of Ministers of the USSR on January 10, 1952.

3. INSTEAD OST 20010-38

4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

Designation of the referenced technical document	Item number
GOST 3262-75	Introductory part
GOST 6211-81	»
GOST 6485-69	2, 3
GOST 19853-74	1

5. The validity period was lifted according to Gosstandart Decree dated December 18, 1984 No. 4538 (IUS 3-85)

6. EDITION with Amendments No. 1, 2, approved in December 1969, December 1984 (IUS 1-70, 3-85)

I. DIMENSIONS

1. The profile and dimensions of a conical inch thread with a profile angle of 60° must correspond to the drawings. 1 and table. 1.

Table 1

Designation, thread size	Number of threads per 1¢¢	Size in mm
		Thread pitch	Thread length		thread diameter in the main plane			Internal diameter of thread at the end of the pipe	Working coil height
				from the end of the pipe to the main plane
					outer	interior
d 2 = D 2	d = D	d 1 = D 1

Notes:

1. When screwing together without tension a pipe and a coupling with nominal thread sizes, the main plane of the pipe thread coincides with the end of the coupling.

2. Size d T

reference.

3. Instead of a 1/16 ¢¢ thread, it is allowed to use an M6´1 conical thread in accordance with GOST 19853.

4. The number of turns with a full profile in a threaded connection should not be less than two.

5. It is allowed to reduce the size l

2 (distance from the main plane to the end of the pipe), in this case the requirement of clause 4 of this standard regarding the difference in dimensions
l
1
-l
2 must be met.

The thread pitch is measured parallel to the thread axis.

The bisector of the profile angle is perpendicular to the thread axis.

Symbol for tapered thread 3 /

4 ¢¢
:

II. TOLERANCES

2. The pipe thread (external thread) is checked by the average diameter with a thread ring gauge in accordance with GOST 6485. Axial displacement of the main plane of the pipe D l

2 (Fig. 2) relative to the nominal location should not exceed
±P
(thread pitch).

3. The coupling thread (internal thread) is checked according to the average diameter using a thread plug gauge in accordance with GOST 6485-69. Axial displacement of the main plane of the coupling D l

2 (Fig. 3) relative to the nominal location should not exceed
±P
(thread pitch).

(Changed edition, Amendment No. 1, 2).

4. Size difference l

1 -
l
2 should be no less than the difference indicated in the table.
1 nominal sizes l
1 and
l
2.

5. Deviation of the distances between the tops and bottoms of the tube and coupling threads from the line of the average thread diameter (d h

1 and d
h
2 according to devil. 4) must not exceed:

table 2

(Changed edition, Amendment No. 2).

6. Deviations of half the profile angle, slope angle (j/2) and deviation in thread pitch (deviations in the distances between any turns) should not exceed:

Table 3

(Changed edition, Amendment No. 1, 2).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool Industry

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Types and parameters of thread

The parameters by which threads are divided into different types are:

• units of diameter (metric, inch, etc.);
• number of thread starts (one-, two- or three-thread);
• the shape in which the profile elements are made (triangular, rectangular, round, trapezoidal);
• direction of rise of turns (right or left);
• location on the product (external or internal);
• surface shape (cylindrical or conical);
• purpose (fastening, fastening and sealing, chassis).

Metric thread parameters

Depending on the above parameters, the following types of thread are distinguished:

• cylindrical, which is designated by the letters MJ;
• metric and conical, designated M and MK respectively;
• pipe, designated by the letters G and R;
• with a round profile, named after Edison and marked with the letter E;
• trapezoidal, designated Tr;
• round, used for installation of sanitary fittings, – Kr;
• thrust and thrust reinforced, marked as S and S45, respectively;
• inch thread, which can also be cylindrical and conical - BSW, UTS, NPT;
• used to connect pipes installed in oil wells.

Thread types according to GOST

I. DIMENSIONS

I. DIMENSIONS

1. The profile and dimensions of a conical inch thread with a profile angle of 60° must correspond to Figure 1 and Table 1.

Fig. 1 - Conical inch thread

; ; ; taper Fig.1

The thread pitch is measured parallel to the thread axis. The bisector of the profile angle is perpendicular to the thread axis.

Example of a symbol for a tapered thread:

K
GOST 6111-52
Table 1 Dimensions in millimeters

Designation, thread size, inches	Number of threads per	Thread pitch	Thread length		Thread diameter in the main plane			Internal diameter of thread at the end of the pipe	Working coil height
from the end of the pipe to the main plane	outer	interior

Notes:

1. When screwing together without tension a pipe and a coupling with nominal thread sizes, the main plane of the pipe thread coincides with the end of the coupling.

2. Size is for reference.

3. Instead of threads, it is allowed to use conical threads M6x1 in accordance with GOST 19853.

4. The number of turns with a full profile in a threaded connection should not be less than two.

5. It is allowed to reduce the size (distance from the main plane to the end of the pipe), while the requirement of paragraph 4 regarding dimensions must be met.