GOST 12820-80 Steel Plane Welded Flanges for Pnom from 0.1 to 2.5 MPa (1 to 25 kgf/cm2). Design and Dimensions

GOST 12820-80 applies to steel plane welded flanges of pipelines and fittings, as well as to mating flanges of valves, fittings of machines and instruments, and nozzles of apparatus and tanks, for nominal pressure Pnom from 0.1 to 2.5 MPa (1 to 25 kgf/cm²) and medium temperature from 203 to 573 K (minus 70 to plus 300 °C).

Requirements of clauses 1, 2 (except for the “Mass” parameter), 3, 6, 10 and 11 of this standard are mandatory; the remaining requirements are recommended.

The design and dimensions of flanges shall conform to those shown in the drawing and in Tables 1–5.

For Pnom 0.1–1.0 MPa (1–10 kgf/cm²); for Pnom 1.6 and 2.5 MPa (16 and 25 kgf/cm²).

Notes:

1. Surface finish A with roughness Ra ≤ 100 μm is allowed.
2. The bevel angle for the weld joint may be (55 ± 3)°.

Table 1. Dimensions, mm

Steel plane welded flanges for Pnom from 0.1 to 2.5 MPa (from 1 to 25 kgf/cm²). Design and dimensions	GOST 12820-80

Table 2. Dimensions, mm

Nominal bore Dy	Pnom 0.1 and 0.25 MPa (1 and 2.5 kgf/cm²)
	dn	dv	b	Weight, kg
				with raised face	with tongue	with groove
10	14	15	8	0.25	0.25	0.24
15	18	19		0.29	0.29	0.27
20	20	26	10	0.45	0.45	0.42
25	32	33		0.55	0.55	0.52
32	38	39		0.79	0.79	0.75
40	45	46		0.95	0.93	0.90
50	57	59		1.04	1.02	0.98
65	76	78	11	1.39	1.37	1.32
80	89	91		1.84	1.79	1.74
100	108 (A)	110		2.14	2.11	2.01
	114 (B)	116		2.05	1.99	1.92
125	133 (A)	135	13	2.60	2.56	2.42
	140 (B)	142		2.47	2.38	2.29
150	152 (A)	154		3.61	3.62	3.41
	159 (B)	161		3.43	3.39	3.23
	168 (C)	170		3.20	3.09	3.00
(175)	194	196		3.77	3.73	3.55
200	219	222	15	4.73	4.69	4.48
(225)	245	245	17	5.93	5.95	5.64
250	273	273	18	6.95	6.92	6.62
300	325	325		9.33	9.22	8.79
350	377	377		10.45	10.33	9.87
400	426	426		11.64	11.51	9.96
(450)	480	480	20	14.56	14.35	13.82
500	530	530		16.01	15.86	15.15
600	630	630		21.35	21.03	20.08
(700)	720	720	21	29.15	28.73	27.13
800	820	820		36.63	36.15	34.14
(900)	920	920	23	44.20	-	-
1000	1020	1020	25	52.58
1200	1220	1220		62.36
1400	1420	1420	27	77.60
1600	1620	1620		94.30
(1800)	1820	1820	30	116.60
2000	2020	2020		132.98
(2200)	2220	2220	36	190.30
2400	2420	2420	41	237.22

Table 3. Dimensions, mm

Nominal bore Dy	Pnom 0.6 MPa (6 kgf/cm²)
	dn	dv	b	Weight, kg
				with raised face	with tongue	with groove
10	14	15	10	0.31	0.31	0.30
15	18	19		0.33	0.33	0.32
20	25	26	12	0.53	0.53	0.51
25	32	33		0.64	0.64	0.62
32	38	39	13	1.01	1.02	0.98
40	45	46		1.21	1.19	1.16
50	57	59		1.33	1.30	1.27
65	76	78		1.63	1.60	1.55
80	89	91	15	2.44	2.40	2.35
100	108 (A)	110		2.85	2.81	2.72
	114 (B)	116		2.73	2.66	2.60
125	133 (A)	135	17	3.88	3.84	3.70
	140 (B)	142		3.68	3.59	3.50
150	152 (A)	154		4.63	4.65	4.43
	159 (B)	161		4.39	4.36	4.19
	168 (C)	170		4.09	3.98	3.89
(175)	194	196	19	5.36	5.33	5.14
200	219	222		5.89	5.86	5.65
(225)	245	245		6.60	6.60	6.29
250	273	273	20	7.67	7.64	7.34
300	325	325		10.28	10.18	9.74
350	377	377	22	12.58	12.45	12.00
400	426	426	24	15.20	15.07	14.53
(450)	480	480		17.25	17.04	16.52
500	530	530	25	19.72	19.57	18.86
600	630	630		26.24	25.91	24.96
(700)	720	720	27	36.68	36.27	35.28
800	820	820		46.14	45.66	43.65
(900)	920	920	29	55.10	-	-
1000	1020	1020	31	64.36
1200	1220	1220	34	99.03
1400	1420	1420	43	161.45
1600	1620	1620	48	203.05

Table 4. Dimensions, mm

Nominal bore Dy	Pnom 1.0 MPa (10 kgf/cm²)
	d n	d v	b	Weight, kg
				with raised face	with tongue	with groove
10	14	15	10	0.46	0.46	0.44
15	18	19		0.51	0.51	0.49
20	25	26	12	0.74	0.75	0.71
25	32	33		0.89	0.89	0.84
32	38	39	14	1.40	1.39	1.34
40	45	46	15	1.71	1.72	1.67
50	57	59		2.06	2.03	1.99
65	76	78	17	2.80	2.77	2.69
80	89	91		3.19	3.13	3.08
100	108 (A)	110	19	3.96	3.94	3.76
	114 (B)	116		3.81	3.76	3.61
125	133 (A)	135	21	5.40	5.38	5.18
	140 (B)	142		5.15	5.08	4.93
150	152 (A)	154		6.92	6.97	6.62
	159 (B)	161		6.62	6.62	6.33
	168 (C)	170		6.24	6.17	5.95
(175)	194	196		7.32	7.31	7.02
200	219	222		8.05	8.04	7.71
(225)	245	245		9.30	9.30	9.05
250	273	273	23	10.65	10.66	10.22
300	325	325	24	12.90	12.89	12.21
350	377	377		15.85	15.79	14.96
400	426	426	26	21.56	21.51	20.49
(450)	480	480		22.76	22.68	21.67
500	530	530	28	22.70	28.02	26.86
600	630	630	31	39.40	39.26	37.48
(700)	720	720	34	59.46	58.58	56.45
800	820	820	37	79.16	77.89	76.08
(900)	920	920	40	94.13	-	-
1000	1020	1020	43	118.43
1200	1220	1222	51	197.44
1400	1420	1420	60	278.92
1600	1620	1620	70	422.65

Table 5. Dimensions, mm

Nominal bore Dy	Pnom 1.6 MPa (16 kgf/cm²)
	d n	d v	b	Weight, kg
				with raised face	with tongue	with groove
10	14	15	12	0.54	0.54	0.53
15	18	19		0.61	0.61	0.58
20	25	26	14	0.86	0.86	0.83
25	32	33	16	1.17	1.17	1.13
32	38	39		1.58	1.58	1.53
40	45	46	17	1.96	1.93	1.89
50	57	59	19	2.58	2.54	2.50
65	76	78	21	3.42	3.38	3.30
80	89	91		3.71	3.71	3.70
100	108 (A)	110	23	4.73	4.72	4.53
	114 (B)	116		4.55	4.51	4.35
125	133 (A)	135	25	6.38	6.38	6.15
	140 (B)	142		6.08	6.03	5.85
150	152 (A)	154		8.16	8.21	7.87
	159 (B)	161		7.81	7.81	7.52
	168 (C)	170		7.36	7.29	7.07
(175)	194	196		8.64	8.63	8.34
200	219	222	27	10.10	10.21	9.88
(225)	245	245		11.70	12.08	11.66
250	273	273	28	14.49	14.48	14.06
300	325	325		17.78	17.59	17.12
350	377	377	30	22.88	22.65	21.99
400	426	426	34	31.00	30.76	29.94
(450)	480	480	38	39.64	39.08	38.55
500	530	530	44	57.01	56.17	55.74
600	630	630	45	80.03	79.03	78.80
(700)	720	720	47	84.21	84.34	83.06
800	820	820	49	104.41	103.15	101.34
(900)	920	920	54	128.60	-	-
1000	1020	1020	58	179.37
1200	1220	1220	71	297.78

Nominal bore Dy	Pnom 2.5 MPa (25 kgf/cm²)
	d n	d v	b	Weight, kg
				with raised face	with tongue	with groove
10	14	15	14	0.63	0.64	0.61
15	18	19		0.70	0.71	0.68
20	25	26	16	0.98	0.97	0.94
25	32	33		1.17	1.17	1.13
32	38	39	18	1.77	1.76	1.72
40	45	46	19	2.18	2.15	2.11
50	57	59	21	2.71	2.80	2.76
65	76	78		3.22	3.21	3.14
80	89	91	23	4.06	4.00	3.95
100	108 (A)	110	25	5.92	5.89	5.72
	114 (B)	116		5.72	5.66	5.52
125	133 (A)	135	27	8.26	8.25	8.23
	140 (B)	142		7.94	8.07	7.91
150	152 (A)	154		10.51	10.50	10.22
	159 (B)	161		10.12	10.07	9.83
	168 (C)	170		9.63	9.51	9.34
(175)	194	196	29	11.49	11.43	11.19
200	219	222		13.34	13.24	13.01
(225)	245	245	31	16.93	16.82	16.52
250	273	273		18.90	18.78	18.52
300	325	325	32	23.95	23.53	23.29
350	377	377	38	34.35	34.57	34.18
400	426	426	40	44.62	44.01	43.56
(450)	480	480	44	51.80	51.10	50.71
500	530	530	48	67.30	66.63	66.36
600	630	630	49	90.87	89.13	88.91
(700)	720	720	55	126.82	124.92	124.11
800	820	820	63	181.43	174.52	174.15

Notes to Tables 1–5:

1. Flanges with nominal bores shown in parentheses shall not be used for general-purpose valves.
2. Mass is calculated based on the nominal dimensions of the flange.

Flanges are manufactured with sealing surfaces of types 1, 2 and 3 and mating dimensions per GOST 12815-80. Flanges with sealing surfaces of types 4, 5, 8 and 9 are also allowed.

Example of a designation for ordering a round steel plane welded flange Dy 50 mm for Pnom 1.0 MPa (10 kgf/cm²), made of steel 25, type 1 (with raised face):

Flange 1-50-10 steel 25 GOST 12820-80

Same, for a square flange:

Flange square 1-50-10 steel 25 GOST 12820-80

When ordering flanges with a tongue-and-groove facing for PTFE gaskets, the letter F is added to the designation after the nominal pressure value. When ordering flanges with Dy 100, 125 or 150 mm, the corresponding letter from Tables 1–5 is added after the nominal bore designation.

Flanges are recommended to be manufactured by forging, stamping, oxygen or plasma-arc cutting, or by bending from strip stock with subsequent butt welding. Manufacture by other methods is allowed.

Dimensional tolerances:

• dv — per H14 (when produced by stamping — per accuracy class T4 of GOST 7505-89);
• b — for stamped flanges, as well as those manufactured by bending from strip stock with subsequent butt welding and hot straightening — per accuracy class T4 of GOST 7505-89. In this case, weld reinforcement is not taken into account when determining the tolerance.

Dimensions and tolerances not specified are per working drawings approved in accordance with the established procedure.

The use of pipes of other diameters is allowed.

For flanges with Dy > 200 mm, boring the inner diameter to match the actual outer diameter of the pipe with a side clearance of no more than 2.5 mm is allowed; for flanges with Dy ≤ 200 mm, the inner diameter may be made without clearance to the pipe.

Technical requirements, the material of flanges, fasteners and gaskets, as well as marking, packaging and transportation, are per GOST 12816-80. OKP codes are given in the appendix.

APPENDIX (informative). OKP codes

Flange designation			Flanges made of carbon and alloy steel	Flanges made of corrosion-resistant steel
			OKP codes
Round flanges
1-10-2.5;	2-10-2.5;	3-10-2.5	37 9941 4058 06	37 9941 5001 08
1-15-2.5;	2-15-2.5;	3-15-2.5	37 9941 4059 05	37 9941 5002 07
1-20-2.5;	2-20-2.5;	3-20-2.5	37 9941 4060 01	37 9941 5003 06
1-25-2.5;	2-25-2.5;	3-25-2.5	37 9941 4061 00	37 9941 5004 05
1-32-2.5;	2-32-2.5;	3-32-2.5	37 9941 4062 10	37 9941 5005 04
1-40-2.5;	2-40-2.5;	3-40-2.5	37 9941 4063 09	37 9941 5004 03
1-50-2.5;	2-50-2.5;	3-50-2.5	37 9941 4064 08	37 9941 5005 02
1-65-2.5;	2-65-2.5;	3-65-2.5	37 9941 4065 07	37 9941 5006 01
1-80-2.5;	2-80-2.5;	3-80-2.5	37 9941 4066 06	37 9941 5007 00
1-100-2.5;	2-100-2.5;	3-100-2.5	37 9941 4067 05	37 9941 5008 10
1-125-2.5;	2-125-2.5;	3-125-2.5	37 9941 4068 04	37 9941 5009 09
1-150-2.5;	2-150-2.5;	3-150-2.5	37 9941 4069 03	37 9941 5010 07
1-175-2.5;	2-175-2.5;	3-175-2.5	37 9941 4070 10	37 9941 5011 06
1-200-2.5;	2-200-2.5;	3-200-2.5	37 9941 4071 09	37 9941 5012 05
1-225-2.5;	2-225-2.5;	3-225-2.5	37 9941 4072 08	37 9941 5013 04
1-250-2.5;	2-250-2.5;	3-250-2.5	37 9941 4073 07	37 9941 5014 03
1-300-2.5;	2-300-2.5;	3-300-2.5	37 9941 4074 06	37 9941 5015 02
1-350-2.5;	2-350-2.5;	3-350-2.5	37-9941 4075 05	37 9941 5016 01
1-400-2.5;	2-400-2.5;	3-400-2.5	37-9941 4076 04	37 9941 5017 00
1-450-2.5;	2-450-2.5;	3-450-2.5	37 9941 4077 03	37 9941 5018 10
1-500-2.5;	2-500-2.5;	3-500-2.5	37 9941 4078 02	37 9941 5019 09
1-600-2.5;	2-600-2.5;	3-600-2.5	37 9941 4079 01	37 9941 5020 05
1-700-2.5;	2-700-2.5;	3-700-2.5	37 9941 4080 08	37 9941 5021 04
1-800-2.5;	2-800-2.5;	3-800-2.5	37 9941 4081 07	37 9941 5022 03
1-900-2.5			37 9941 4082 06	37 9941 5023 02
1-1000-2.5			37 9941 4083 05	37 9941 5024 01
1-1200-2.5			37 9941 4084 04	37 9941 5025 00
1-1400-2.5			37 9941 4085 03	37 9941 5026 10
1-1600-2.5			37 9941 4086 02	37 9941 5027 09
1-1800-2.5			37 9941 4609 08	37 9941 5469 09
1-2000-2.5			37 9941 4610 04	37 9941 5470 05
1-2200-2.5			37 9941 4611 03	37 9941 5471 04
1-2400-2.5			37 9941 4612 02	37 9941 5472 03
Square flanges
1-10-2.5;	2-10-2.5;	3-10-2.5	37 9955 4001 08	37 9955 5001 04
1-15-2.5;	2-15-2.5;	3-15-2.5	37-9955 4002 07	37 9955 5002 03
1-20-2.5;	2-20-2.5;	3-20-2.5	37 9955 4003 06	37 9955 5003 02
1-25-2.5;	2-25-2.5;	3-25-2.5	37 9955 4004 05	37 9955 5004 01
1-32-2.5;	2-32-2.5;	3-32-2.5	37 9955 4005 04	37 9955 5005 00
1-40-2.5;	2-40-2.5;	3-40-2.5	37 9955 4006 03	37 9955 5006 10
1-50-2.5;	2-50-2.5;	3-50-2.5	37 9955 4007 02	37 9955 5007 09
1-65-2.5;	2-65-2.5;	3-65-2.5	37 9955 4008 01	37 9955 5008 08
1-80-2.5;	2-80-2.5;	3-80-2.5	37 9955 4009 00	37 9955 5009 07
1-100-2.5;	2-100-2.5;	3-100-2.5	37 9955 4010 07	37 9955 5010 03
Round flanges
1-10-6;	2-10-6;	3-10-6	37 9941 4087 01	37 9941 5028 08
1-15-6;	2-15-6;	3-15-6	37 9941 4088 00	37 9941 5029 07
1-20-6;	2-20-6;	3-20-6	37 9941 4089 10	37 9941 5030 03
1-25-6;	2-25-6;	3-25-6	37 9941 4090 06	37 9941 5031 02
1-32-6;	2-32-6;	3-32-6	37 9941 4091 05	37 9941 5032 01
1-40-6;	2-40-6;	3-40-6	37 9941 4092 01	37 9941 5033 00
1-50-6;	2-50-6;	3-50-6	37 9941 4093 03	37 9941 5034 10
1-65-6;	2-65-6;	3-65-6	37 9941 4094 02	37 9941 5035 09
1-80-6;	2-80-6;	3-80-6	37 9941 4095 01	37 9941 5036 08
1-100-6;	2-100-6;	3-100-6	37 9941 4096 00	37 9941 5037 07
1-125-6;	2-125-6;	3-125-6	37 9941 4097 10	37 9941 5038 06
1-150-6;	2-150-6;	3-150-6	37 9941 4098 09	37 9941 5039 05
1-175-6;	2-175-6;	3-175-6	37 9941 4099 08	37 9941 5040 04
1-200-6;	2-200-6;	3-200-6	37 9941 4100 10	37 9941 5041 00
1-225-6;	2-225-6;	3-225-6	37 9941 4101 09	37 9941 5042 10
1-250-6;	2-250-6;	3-250-6	37 9941 4102 08	37 9941 5043 09
1-300-6;	2-300-6;	3-300-6	37 9941 4103 07	37 9941 5044 08
1-350-6;	2-350-6;	3-350-6	37 9941 4104 06	37 9941 5045 07
1-400-6;	2-400-6;	3-400-6	37 9941 4105 05	37 9941 5046 06
1-450-6;	2-450-6;	3-450-6	37 9941 4106 04	37 9941 5047 05
1-500-6;	2-500-6;	3-500-6	37 9941 4107 03	37 9941 5048 04
1-600-6;	2-600-6;	3-600-6	37 9941 4108 02	37 9941 5049 03
1-700-6;	2-700-6;	3-700-6	37 9941 4109 01	37 9941 5050 10
1-800-6;	2-800-6;	3-800-6	37 9941 4110 08	37 9941 5051 09
1-900-6			37 9941 4111 07	37 9941 5052 08
1-1000-6			37 9941 4112 06	37 9941 5053 07
1-1200-6			37 9941 4613 01	37 9941 5473 02
1-1400-6			37 9941 4614 00	37 9941 5474 01
1-1600-6			37 9941 4615 10	37 9941 5475 00
Square flanges
1-10-6;	2-10-6;	3-10-6	37 9955 4011 06	37 9955 5011 02
1-15-6;	2-15-6;	3-15-6	37 9955 4012 05	37 9955 5012 01
1-20-6;	2-20-6;	3-20-6	37 9955 4013 04	37 0955 5013 00
1-25-6;	2-25-6;	3-25-6	37 9955 4014 03	37 9955 5014 10
1-32-6;	2-32-6;	3-32-6	37 9955 4015 02	37 9955 5015 09
1-40-6;	2-40-6;	3-40-6	37 9955 4016 01	37 9955 5016 08
1-50-6;	2-50-6;	3-50-6	37 9955 4017 00	37 9955 5017 07
1-65-6;	2-65-6;	3-65-6	37 9955 4018 10	37 9955 5018 06
1-80-6;	2-80-6;	3-80-6	37 9955 4019 09	37 9955 5019 05
1-100-6;	2-100-6;	3-100-6	37 9955 4020 05	37 9955 5020 01
Round flanges
1-10-10;	2-10-10;	3-10-10	37 9941 4113 05	37 9941 5054 06
1-15-10;	2-15-10;	3-15-10	37 9941 4114 04	37 9941 5055 05
1-20-10;	2-20-10;	3-20-10	37 9941 4115 03	37 9941 5056 04
1-25-10;	2-25-10;	3-25-10	37 9941 4116 02	37 9941 5057 03
1-32-10;	2-32-10;	3-32-10	37 9941 4117 01	37 9941 5058 02
1-40-10;	2-40-10;	3-40-10	37 9941 4118 00	37 9941 5059 01
1-50-10;	2-50-10;	3-50-10	37 9941 4119 10	37 9941 5060 08
1-65-10;	2-65-10;	3-65-10	37 9941 4120 06	37 9941 5061 07
1-80-10;	2-80-10;	3-80-10	37 9941 4121 05	37 9941 5062 06
1-100-10;	2-100-10;	3-100-10	37 9941 4122 04	37 9941 5063 05
1-125-10;	2-125-10;	3-125-10	37 9941 4123 03	37 9941 5064 04
1-150-10;	2-150-10;	3-150-10	37 9941 4124 02	37 9941 5065 03
1-175-10;	2-175-10;	3-175-10	37 9941 4125 01	37 9941 5066 02
1-200-10;	2-200-10;	3-200-10	37 9941 4126 00	37 9941 5067 01
1-225-10;	2-225-10;	3-225-10	37 9941 4127 10	37 9941 5068 00
1-250-10;	2-250-10;	3-250-10	37 9941 4128 09	37 9941 5069 10
1-300-10;	2-300-10;	3-300-10	37 9941 4129 08	37 9941 5070 06
1-350-10;	2-350-10;	3-350-10	37 9941 4130 04	37 9941 5071 05
1-400-10;	2-400-10;	3-400-10	37 9941 4131 03	37 9941 5073 03
1-500-10;	2-500-10;	3-500-10	37 9941 4132 00	37 9941 5074 02
1-600-10;	2-600-10;	3-600-10	37 9941 4133 01	37 9941 5075 01
1-700-10;	2-700-10;	3-700-10	37 9941 4616 09	37 9941 5476 10
1-800-10;	2-800-10;	3-800-10	37 9941 4617 08	37 9941 5477 09
1-900-10			37 9941 4618 07	37 9941 5478 08
1-1000-10			37 9941 4619 06	37 9941 5479 07
1-1200-10			37 9941 4620 02	37 9941 5480 03
1-1400-10			37 9941 4621 01	37 9941 5481 02
1-1600-10			37 9941 4622 00	37 9941 5482 01
Square flanges
1-10-10;	2-10-10;	3-10-10	37 9955 4021 04	37 9955 5021 00
1-15-10;	2-15-10;	3-15-10	37 9955 4022 03	37 9955 5022 10
1-20-10;	2-20-10;	3-20-10	37 9955 4023 02	37 9955 5023 09
1-25-10;	2-25-10;	3-25-10	37 9955 4024 01	37 9955 5024 08
1-32-10;	2-32-10;	3-32-10	37 9955 4025 00	37 9955 5025 07
1-40-10;	2-40-10;	3-40-10	37 9955 4026 10	37 9955 5026 06
1-50-10;	2-50-10;	3-50-10	37 9955 4027 09	37 9955 5027 05
1-65-10;	2-65-10;	3-65-10	37 9955 4028 08	37 9955 5028 04
1-80-10;	2-80-10;	3-80-10	37 9955 4029 07	37 9955 5029 03
Round flanges
1-10-16;	2-10-16;	3-10-16	37 9941 4133 10	37 9941 5076 00
1-15-16;	2-15-16;	3-15-16	37 9941 4134 09	37 9941 5077 10
1-20-16;	2-20-16;	3-20-16	37 9941 4135 08	37 9941 5078 09
1-25-16;	2-25-16;	3-25-16	37 9941 4136 07	37 9941 5079 08
1-32-16;	2-32-16;	3-32-16	37 9941 4137 06	37 9941 5080 04
1-40-16;	2-40-16;	3-40-16	37 9941 4138 00	37 9941 5081 03
1-50-16;	2-50-16;	3-50-16	37 9941 4139 04	37 9941 5082 02
1-65-16;	2-65-16;	3-65-16	37 9941 4140 02	37 9941 5083 01
1-80-16;	2-80-16;	3-80-16	37 9941 4141 01	37 9941 5084 00
1-100-16;	2-100-16;	3-100-16	37 9941 4142 00	37 9941 5085 10
1-125-16;	2-125-16;	3-125-16	37 9941 4143 10	37 9941 5086 09
1-150-16;	2-150-16;	3-150-16	37 9941 4144 09	37 9041 5087 08
1-175-16;	2-175-16;	3-175-16	37 9941 4145 08	37 9941 5088 07
1-200-16;	2-200-16;	3-200-16	37 9941 4146 07	37 9941 5089 06
1-225-16;	2-225-16;	3-225-16	37 9941 4147 06	37 9941 5090 02
1-250-16;	2-250-16;	3-250-16	37 9941 4148 05	37 9941 5091 01
1-300-16;	2-300-16;	3-300-16	37 9941 4149 04	37 9941 5092 00
1-350-16;	2-350-16;	3-350-16	37 9941 4150 00	37 9941 5093 10
1-400-16;	2-400-16;	3-400-16	37 9941 4151 10	37 9941 5094 09
1-450-16;	2-450-16;	3-450-16	37 9941 4152 09	37 9941 5095 08
1-500-16;	2-500-16;	3-500-16	37 9941 4153 08	37 9941 5096 07
1-600-16;	2-600-16;	3-600-16	37 9941 4154 07	37 9941 5097 06
1-700-16;	2-700-16;	3-700-16	37 9941 4623 10	37 9941 5483 00
1-800-16;	2-800-16;	3-800-16	37 9941 4624 09	37 9941 5484 10
1-900-16;			37 9941 4625 08	37 9941 5485 09
1-1000-16;			37 9941 4626 07	37 9941 5486 08
1-1200-16			37 9941 4627 06	37 9941 5487 07
Square flanges
1-10-16;	2-10-16;	3-10-16	37 9955 4030 03	37 9955 5030 10
1-15-16;	2-15-16;	3-15-16	37 9955 4031 02	37 9955 5031 09
1-20-16;	2-20-16;	3-20-16	37 9955 4032 01	37 9955 5032 08
1-25-16;	2-25-16;	3-25-16	37 9955 4033 00	37 9955 5033 07
1-32-16;	2-32-16;	3-32-16	37 9955 4034 10	37 9955 5034 06
1-40-16;	2-40-16;	3-40-16	37 9955 4035 09	37 9955 5035 05
1-50-16;	2-50-16;	3-50-16	37 9955 4036 08	37 9955 5036 04
1-65-16;	2-65-16;	3-65-16	37 9955 4037 07	37 9955 5037 03
1-80-16;	2-80-16;	3-80-16	37 9955 4038 06	37 9955 5038 02
Round flanges
1-10-25;	2-10-25;	3-10-25	37 9941 4155 06	37 9941 5098 05
1-15-25;	2-15-25;	3-15-25	37 9941 4156 05	37 9941 5099 04
1-20-25;	2-20-25;	3-20-25	37 9941 4157 04	37 9941 5100 06
1-25-25;	2-25-25;	3-25-25	37 9941 4158 03	37 9941 5101 05
1-32-25;	2-32-25;	3-32-25	37 9941 4159 02	37 9941 5102 04
1-40-25;	2-40-25;	3-40-25	37 9941 4160 09	37 9941 5103 03
1-50-25;	2-50-25;	3-50-25	37 9941 4161 08	37 9941 5104 02
1-65-25;	2-65-25;	3-65-25	87 9941 4162 07	37 9941 5105 01
1-80-25;	2-80-25;	3-80-25	37 9941 4163 06	37 9941 5106 00
1-100-25;	2-100-25;	3-100-25	37 9941 4164 05	37 9941 5107 10
1-125-25;	2-125-25;	3-125-25	37 9941 4165 04	37 9941 5108 09
1-150-25;	2-150-25;	3-150-25	37 9941 4166 03	37 9941 5109 08
1-175-25;	2-175-25;	3-175-25	37 9941 4167 02	37 9941 5110 04
1-200-25;	2-200-25;	3-200-25	37 9941 4168 01	37 9941 5111 03
1-225-25;	2-225-25;	3-225-25	37 9941 4169 00	37 9941 5112 02
1-250-25;	2-250-25;	3-250-25	37 9941 4170 07	37 9941 5113 01
1-300-25;	2-300-25;	3-300-25	37 9941 4171 06	37 9941 5114 00
1-350-25;	2-350-25;	3-350-25	37 9941 4172 05	37 9941 5115 10
1-400-25;	2-400-25;	3-400-25	37 9941 4173 04	37 9941 5116 09
1-450-25;	2-450-25;	3-450-25	37 9941 4174 03	37 9941 5117 08
1-500-25;	2-500-25;	3-500-25	37 9941 4175 02	37 9941 5118 07
1-600-25;	2-600-25;	3-600-25	37 9941 4628 05	37 9941 5488 06
1-700-25;	2-700-25;	3-700-25	37 9941 4629 04	37 9941 5489 05
1-800-25;	2-800-25;	3-800-25	37 9941 4630 00	37 9941 5490 01
Square flanges
1-10-25;	2-10-25;	3-10-25	37 9955 4039 05	37 9955 5039 01
1-15-25;	2-15-25;	3-15-25	37 9955 4040 01	37 9955 5040 08
1-20-25;	2-20-25;	3-20-25	37 9955 4041 00	37 9955 5041 07
1-25-25;	2-25-25;	3-25-25	37 9955 4042 10	37 9955 5042 06
1-32-25;	2-32-25;	3-32-25	37 9955 4043 09	37 9955 5043 05
1-40-25;	2-40-25;	3-40-25	37 9955 4044 08	37 9955 5044 04
1-50-25;	2-50-25;	3-50-25	37 9955 4045 07	37 9955 5045 03

If flanges are manufactured with a tongue-and-groove sealing surface (types 4, 5, 8 and 9), the OKP codes remain unchanged.

Referenced regulatory and technical documents

Designation of the referenced regulatory document	Clause number
GOST 7505-89	5
GOST 12815-80	3
GOST 12816-80	10