Socket Weld Flange

Size Range: DN15-DN80 (1/2″- 3″)
Pressure Class: PN20-PN250 (Class 150 – Class 1500)
Flange Facing Types: RF, RJ, M, FM, T, G
Design Standards: ASME B16.5, JIS B2220, EN 1092-1, HG/T 20592 and other international standards
Material Selection: 304 / 316L Stainless Steel, Hastelloy C, Alloy 20, Duplex 2205, Super Duplex 2507, 904L, 310S, Titanium TA2, Carbon Steel 20# and customized materials
Service Temperature: -196°C to +1000°C
Compatible Media: Water, neutral gas, liquids, alcohol, oil, fuel, steam, organic solvents, acid and alkaline media
Application Industries: Oil & Gas, Chemical, Petrochemical, Power, Marine, Food & Beverage, Pharmaceutical, Water Treatment, HVAC, Metallurgy, and Environmental Engineering.

Product details

Socket Weld Flange, commonly abbreviated as SW Flange, is one of the most widely used types of forged flanges for small-diameter, medium-to-high pressure piping systems.

The pipe is inserted into the socket bore of the flange and positioned against the internal shoulder. A fillet weld is then applied around the outside of the flange hub, creating a permanent welded connection between the pipe and flange.

The two mating flanges are tightened together by bolts, compressing the gasket between the flange faces to achieve reliable face sealing performance.

Product Specifications

Note: The flange inner diameter (B) is determined by the wall thickness of the steel pipe and shall be specified by the user at the time of ordering.（Unit: mm）

SW-150LB-1500LB

DN	NPS	Type/Class	Part No	A	D	K	L	Th	n	C	B1	B2	U	N	H	d1	f	P	E	F	d	w	X	y	Z
15	0.5	SW-150LB-SFT	XLXSW150SFT05	21.3	90	60.3	16	M14	4	9.6	15.5	22.5	10	30	14	35.1	1.5
20	0.75	SW-150LB-SFT	XLXSW150SFT075	26.9	100	69.9	16	M14	4	11.2	21	27.5	11	38	14	42.9	1.5
25	1	SW-150LB-SFT	XLXSW150SFT1	33.7	110	79.4	16	M14	4	12.7	27	34.5	13	49	16	50.8	1.5	47.63	6.35	8.74
32	1.25	SW-150LB-SFT	XLXSW150SFT125	42.4	115	88.9	16	M14	4	14.3	35	43.5	14	59	19	63.5	1.5	57.15	6.35	8.74
40	1.5	SW-150LB-SFT	XLXSW150SFT15	48.3	125	98.4	16	M14	4	15.9	41	49.5	16	65	21	73	1.5	65.07	6.35	8.74
50	2	SW-150LB-SFT	XLXSW150SFT2	60.3	150	120.7	18	M16	4	17.5	52	61.5	17	78	24	91.9	1.5	82.55	6.35	8.74
65	2.5	SW-150LB-SFT	XLXSW150SFT25	76.1	180	139.7	18	M16	4	20.7	66	77.6	19	90	27	104.6	1.5	101.6	6.35	8.74
80	3	SW-150LB-SFT	XLXSW150SFT3	88.9	190	152.4	18	M16	4	22.3	77.5	90.5	21	108	29	127	1.5	114.3	6.35	8.74
15	0.5	SW-300LB-SFT	XLXSW300SFT05	21.3	95	66.7	16	M14	4	12.7	15.5	22.5	10	38	21	35.1	1.5	34.14	5.54	7.14	46	25.4	34.9	36.5	23.8
20	0.75	SW-300LB-SFT	XLXSW300SFT075	26.9	115	82.6	18	M16	4	14.3	21	27.5	11	48	24	42.9	1.5	42.88	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	SW-300LB-SFT	XLXSW300SFT1	33.7	125	88.9	18	M16	4	15.9	27	34.5	13	54	25	50.8	1.5	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	SW-300LB-SFT	XLXSW300SFT125	42.4	135	98.4	18	M16	4	17.5	35	43.5	14	64	25	63.5	1.5	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	SW-300LB-SFT	XLXSW300SFT15	48.3	155	114.3	22	M20	4	19.1	41	49.5	16	70	29	73	1.5	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	SW-300LB-SFT	XLXSW300SFT2	60.3	165	127	18	M16	8	20.7	52	61.5	17	84	32	91.9	1.5	82.55	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	SW-300LB-SFT	XLXSW300SFT25	76.1	190	149.2	22	M20	8	23.9	66	77.6	19	100	37	104.6	1.5	101.6	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	SW-300LB-SFT	XLXSW300SFT3	88.9	210	168.3	22	M20	8	27	77.5	90.5	21	117	41	127	1.5	123.83	7.92	11.91	138	108	127	128.6	106.4
15	0.5	SW-600LB-SFT	XLXSW600SFT05	21.3	95	66.7	16	M14	4	14.3	–	22.5	10	38	22	35.1	6.4	34.14	5.54	7.14	46	25.4	34.9	36.5	23.8
20	0.75	SW-600LB-SFT	XLXSW600SFT075	26.9	115	82.6	18	M16	4	15.9	–	27.5	11	48	25	42.9	6.4	42.88	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	SW-600LB-SFT	XLXSW600SFT1	33.7	125	88.9	18	M16	4	17.5	–	34.5	13	54	27	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	SW-600LB-SFT	XLXSW600SFT125	42.4	135	98.4	18	M16	4	20.7	–	43.5	14	64	29	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	SW-600LB-SFT	XLXSW600SFT15	48.3	155	114.3	22	M20	4	22.3	–	49.5	16	70	32	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	SW-600LB-SFT	XLXSW600SFT2	60.3	165	127	18	M16	8	25.4	–	61.5	17	84	37	91.9	6.4	82.55	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	SW-600LB-SFT	XLXSW600SFT25	76.1	190	149.2	22	M20	8	28.6	–	77.6	19	100	41	104.6	6.4	101.6	7.92	11.91	116	85.7	104.8	106.4	84.1
80	3	SW-600LB-SFT	XLXSW600SFT3	88.9	210	168.3	22	M20	8	31.8	–	90.5	21	117	46	127	6.4	123.83	7.92	11.91	138	108	127	128.6	106.4
15	0.5	SW-900LB-SFT	XLXSW900SFT05	21.3	120	82.6	22	M20	4	22.3	–	22.5	10	38	32	35.1	6.4	39.67	6.35	8.74	46	25.4	34.9	36.5	23.8
20	0.75	SW-900LB-SFT	XLXSW900SFT075	26.9	130	88.9	22	M20	4	25.4	–	27.5	11	44	35	42.9	6.4	44.45	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	SW-900LB-SFT	XLXSW900SFT1	33.7	150	101.6	26	M24	4	28.6	–	34.5	13	52	41	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	SW-900LB-SFT	XLXSW900SFT125	42.4	160	111.1	26	M24	4	28.6	–	43.5	14	64	41	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	SW-900LB-SFT	XLXSW900SFT15	48.3	180	123.8	30	M27	4	31.8	–	49.5	16	70	44	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	SW-900LB-SFT	XLXSW900SFT2	60.3	215	165.1	26	M24	8	38.1		61.5	17	105	57	91.9	6.4	95.25	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	SW-900LB-SFT	XLXSW900SFT25	76.1	245	190.5	30	M27	8	41.3	–	77.6	19	124	64	104.6	6.4	107.95	7.92	11.91	116	85.7	104.8	106.4	84.1
15	0.5	SW-1500LB-SFT	XLXSW1500SFT05	21.3	120	82.6	22	M20	4	22.3	–	22.5	10	38	32	35.1	6.4	39.67	6.35	8.74	46	25.4	34.9	36.5	23.8
20	0.75	SW-1500LB-SFT	XLXSW1500SFT075	26.9	130	88.9	22	M20	4	25.4	–	27.5	11	44	35	42.9	6.4	44.45	6.35	8.74	54	33.3	42.9	44.4	31.8
25	1	SW-1500LB-SFT	XLXSW1500SFT1	33.7	150	101.6	26	M24	4	28.6	–	34.5	13	52	41	50.8	6.4	50.8	6.35	8.74	62	38.1	50.8	52.4	36.5
32	1.25	SW-1500LB-SFT	XLXSW1500SFT125	42.4	160	111.1	26	M24	4	28.6	–	43.5	14	64	41	63.5	6.4	60.33	6.35	8.74	75	47.6	63.5	65.1	46
40	1.5	SW-1500LB-SFT	XLXSW1500SFT15	48.3	180	123.8	30	M27	4	31.8	–	49.5	16	70	44	73	6.4	68.27	6.35	8.74	84	54	73	74.6	52.4
50	2	SW-1500LB-SFT	XLXSW1500SFT2	60.3	215	165.1	26	M24	8	38.1	–	61.5	17	105	57	91.9	6.4	95.25	7.92	11.91	103	73	92.1	93.7	71.4
65	2.5	SW-1500LB-SFT	XLXSW1500SFT25	76.1	245	190.5	30	M27	8	41.3	–	77.6	19	124	64	104.6	6.4	107.95	7.92	11.91	116	85.7	104.8	106.4	84.1

Forged construction: Manufactured from forged materials to provide high strength, durability, and excellent pressure resistance.

Socket welding connection: The pipe is inserted into the flange socket and secured by external fillet welding, ensuring a strong and permanent connection.

No internal pipe penetration welding required: Helps reduce welding deformation and simplifies installation.

Excellent vibration resistance: Suitable for piping systems subject to mechanical vibration and pressure fluctuations.

Compact structure: Ideal for small-diameter piping applications where space is limited.

Socket Weld Flange

Product details

Product Specifications

SW-150LB-1500LB

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