GOST 12821 welding neck flange dimensions PN25 2.5Mpa

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Update time : 2026-10-13 08:59:32

GOST 12821 welding neck flange dimensions PN25 2.5Mpa

　　GOST 12821 welding neck flange belongs to the Russian standard flange system. It is one of the manifestations of Russian standard flange (also known as GOST flange), and it is a common flange on equipment or pipeline.

　　GOST 12821 flanges can be used in various sectors. They are a popular choice for applications ranging from water piping systems to the natural gas, oilfield, and offshore oil industries.

Dn, мм	D, мм	D1, мм	d, мм	Dm, мм	Dn, мм	d1, мм	b, мм	h4, мм	n-￠	кg
15	95	65	14	30	19	12	14	33	4	0,79
20	105	75	14	38	26	18	14	34	4	0,97
25	115	85	14	45	33	25	14	36	4	1,18
32	135	100	18	56	39	31	16	43	4	1,83
40	145	110	18	64	46	38	16	45	4	2,19
50	160	125	18	76	58	49	17	45	4	2,78
65	180	145	18	96	77	66	19	50	8	3,71
80	195	160	18	110	90	78	19	52	8	4,44
100	230	190	22	132	110	96	21	58	8	6,51
125	270	220	26	160	135	121	23	65	8	9,41
150	300	250	26	186	161	146	25	68	8	12,52
200	360	310	26	245	222	202	27	75	12	17,44
250	425	370	30	300	278	254	29	75	12	24,40
300	485	430	30	352	330	303	32	80	16	33,29
350	550	490	33	406	382	351	36	85	16	46,57
400	610	550	33	464	432	398	40	100	16	64,81
500	730	660	39	570	535	500	44	100	20	88,91
600	840	770	39	670	636	600	49	115	20	123,70
800	1075	990	45	874	826	790	55	135	24	213,90
1000	1315	1210	56	1 084	1 028	992	59	150	28	312,12
1200	1525	1420	56	1288	1228	1192	62	160	32	387,50

Previous : GOST 12821 welding neck flange dimensions PN40 4.0Mpa

Next : GOST 12821 welding neck flange dimensions PN16 1.6Mpa

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GOST 12821 Weld Neck Flanges – Supplied by Shengtian Group. Shengtian Group offers high-quality GOST 12821 Weld Neck Flanges , manufactured in compliance with Russian standards, designed to provide robust, reliable connections in high-pressure and high-temperature applications.

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GOST flanges are typically made of carbon steel, stainless steel, or alloy steel, and are designed to withstand high pressure and temperature conditions.