Socket Weld Flange

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Size : 1/2″ (15 NB) to 48″ (1200NB)
Standards : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Pressure Rating: Class 150, 300, 600, 1500 / PN6, PN10, PN16, PN25, PN40, PN64 etc.
Stainless Steel Socket Welding Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L
Alloy Steel Socket Welding Flanges: ASTM A182 F1, F5, F9, F11, F22, F91
Special Alloy Socket Welding Flanges : Duplex, Super Duplex, Nickel Alloys
Flange Face Type: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Socket Weld Flanges are essential components in piping systems, known for their strength, precision, and versatility. This guide provides an in-depth look at their specifications, applications, and advantages to help you understand their importance in industrial applications. Socket Weld Flanges are a reliable and efficient solution for high-pressure piping systems. With precise machining, robust materials, and adherence to global standards, these flanges are indispensable in industries ranging from oil and gas to food processing. Their ability to withstand extreme temperatures, resist corrosion, and provide a leak-proof seal makes them a preferred choice for engineers and project managers worldwide.

What Are Socket Weld Flanges?

Socket Weld Flanges are designed for pipes with smaller bore diameters. They feature a socket in which the pipe is inserted and fillet-welded around the hub for a strong, leak-proof connection. These flanges are commonly used in high-pressure and high-temperature applications where precision and durability are critical.

Socket Weld Flanges Applications

Socket Weld Flanges are widely used in industries requiring reliable and leak-proof piping systems. Key applications include:

Oil and Gas: Ideal for transporting hydrocarbons under high pressure.
Petrochemical: Used for handling corrosive chemicals and extreme temperatures.
Power Plants: Critical for steam and condensate pipelines.
Marine: Designed for saltwater applications and corrosion resistance.
Water Treatment: Suitable for high-pressure water pipelines.
Pharmaceuticals and Food Processing: Manufactured with hygienic materials like Stainless Steel for sterile operations.

Socket Weld Flange Technical Specifications
Attribute	Specification
Design Standard	ASME B16.5, ASME B16.47, API 605, MSS SP-44
Material	Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel, Nickel Alloys
Pressure Ratings	Class 150, Class 300, Class 600, Class 1500
Size Range	1/2″ to 3″ (15mm to 80mm)
End Connection	Socket Weld (suitable for pipes with smaller bore diameters)
Face Types	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Surface Finish	CNC-machined finish with roughness as per ASME B16.5 requirements (125-250 AARH)
Bore Tolerance	Precisely machined to match the pipe’s outer diameter to ensure a snug fit.
Bolt Holes	Standardized per ASME B16.5, drilled to accommodate respective class ratings.
Applications	Oil and Gas, Petrochemical, Power Plants, Marine, Water Treatment, Pharmaceuticals, Food Processing
Temperature Range	-50°C to 800°C (depending on material)
Corrosion Resistance	Enhanced with Stainless Steel or Nickel Alloys, suitable for corrosive environments.
Test Pressure	Hydrostatic testing based on flange class rating.
Welding Requirement	Socket depth ensures the pipe is inserted without interfering with the flow inside the pipe.
Optional Coatings	Black Oxide, Galvanized, Anti-rust oil, Epoxy, or as per customer requirements.
Standards Compliance	ASTM A105, ASTM A182 (F304, F316), ASTM A350 LF2, ASTM A694 (F52, F60, F65), or equivalent.


Class 150 Socket Neck Flange Dimensions
Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Flange Length	RF Dia.	RF Height	Socket Depth	PCD	Socket Bore	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	J
1/2	15	90	9.6	30	14	34.9	2	10	60.3	22.2	4	1/2	50	55	5/8	M14	0.8
3/4	20	100	11.2	38	14	42.9	2	11	69.9	27.7	4	1/2	50	65	5/8	M14	0.9
1	25	110	12.7	49	16	50.8	2	13	79.4	34.5	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	14.3	59	19	63.5	2	14	88.9	43.2	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	125	15.9	65	21	73	2	16	98.4	49.5	4	1/2	65	70	5/8	M14	1.4
2	50	150	17.5	78	24	92.1	2	17	120.7	61.9	4	5/8	70	85	3/4	M16	2.3
2 1/2	65	180	20.7	90	27	105	2	19	139.7	74.6	4	5/8	75	90	3/4	M16	3.2
3	80	190	22.3	108	29	127	2	21	152.4	90.7	4	5/8	75	90	3/4	M16	3.7

Class 300 Socket Neck Flange Dimensions
Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Flange Length	RF Dia.	RF Height	Socket Depth	PCD	Socket Bore	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	J
1/2	15	95	12.7	38	21	34.9	2	10	66.7	22.2	4	1/2	55	65	5/8	M14	1.2
3/4	20	115	14.3	48	24	42.9	2	11	82.6	27.7	4	5/8	65	75	3/4	M16	1.4
1	25	125	15.9	54	25	50.8	2	13	88.9	34.5	4	5/8	65	75	3/4	M16	1.4
1 1/4	32	135	17.5	64	25	63.5	2	14	98.4	43.2	4	5/8	70	85	3/4	M16	1.8
1 1/2	40	155	19.1	70	29	73	2	16	114.3	49.5	4	3/4	75	90	7/8	M20	2.7
2	50	165	20.7	84	32	92.1	2	17	127	61.9	8	5/8	75	90	3/4	M16	3.2
2 1/2	65	190	23.9	100	37	105	2	19	149.2	74.6	8	3/4	85	100	7/8	M20	4.6
3	80	210	27	117	41	127	2	21	168.3	90.7	8	3/4	90	110	7/8	M20	5.9

Class 600 Socket Neck Flange Dimensions
Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Flange Length	RF Dia.	RF Height	Socket Depth	PCD	Socket Bore	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	J
1/2	15	95	14.3	38	22	34.9	7	10	66.7	22.2	4	1/2	75	5/8	M14	1.3
3/4	20	115	15.9	48	25	42.9	7	11	82.6	27.7	4	5/8	90	3/4	M16	1.4
1	25	125	17.5	54	27	50.8	7	13	88.9	34.5	4	5/8	90	3/4	M16	1.8
1 1/4	32	135	20.7	64	29	63.5	7	14	98.4	43.2	4	5/8	95	3/4	M16	2.3
1 1/2	40	155	22.3	70	32	73	7	16	114.3	49.5	4	3/4	110	7/8	M20	3.2
2	50	165	25.4	84	37	92.1	7	17	127	61.9	8	5/8	110	3/4	M16	4.1
2 1/2	65	190	28.6	100	41	105	7	19	149.2	74.6	8	3/4	120	7/8	M20	5.9
3	80	210	31.8	117	46	127	7	21	168.3	90.7	8	3/4	125	7/8	M20	7.3

Class 1500 Socket Neck Flange Dimensions
Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Flange Length	RF Dia.	RF Height	Socket Depth	PCD	Socket Bore	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E	F	G	H	J
1/2	15	120	22.3	38	32	34.9	7	10	82.6	22.2	4	3/4	110	7/8	M20	1.8
3/4	20	130	25.4	44	35	42.9	7	11	88.9	27.7	4	3/4	115	7/8	M20	2.3
1	25	150	28.6	52	41	50.8	7	13	101.6	34.5	4	7/8	125	1	M24	3.7
1 1/4	32	160	28.6	64	41	63.5	7	14	111.1	43.2	4	7/8	125	1	M24	4.1
1 1/2	40	180	31.8	70	44	73	7	16	123.8	49.5	4	1	140	1 1/8	M27	5.5
2	50	215	38.1	105	57	92.1	7	17	165.1	61.9	8	7/8	145	1	M24	9.8
2 1/2	65	245	41.3	124	64	105	7	19	190.5	74.6	8	1	160	1 1/8	M27	16.4
3	80	265	47.7	133	N/A	127	7		203.2	N/A	8	1 1/8	180	1 1/4	M30	21.8