Socket Weld Flange Manufacturer

What are Socket Weld Flange?

Socket weld flanges have a socket in which a pipe is inserted; the pipe is secured by one fillet weld located on the exterior of the flange hub. A significant disadvantage with this type of flange is that it is not considered a high-integrity joint because the weld is difficult to prove; thus socket weld flanges are only suitable for low to medium classes (≤ ASME 600). Due to their lower integrity and unsuitability for use at higher pressures, socket weld flanges almost always have flat or raised faces.

Socket weld flanges are designed for small nominal pipe sizes (≤ 4 inches, ≤ 10cm) and are common for ½ to 2-inch pipe sizes (1.3 to 5cm pipe sizes). The mechanical strength of a socket weld flange is similar to that of a slip-on flange, but the slip-on flange may use two welds.

The ASME B31.3 standard states that an approximate gap of 1⁄16th of an inch (1.5mm) between the socket and pipe end is required; this gap allows for thermal expansion due to welding and reduces the likelihood that the weld will crack. In practice, this means that the pipe should be fully inserted into the flange, then retracted by the desired amount (1/16th of an inch, 1.5mm); this gap has been highlighted red on the above image.

The advantage of socket weld flanges is their simple design, they are well suited for small pipe size applications e.g. 2 inches (5cm) and below, and for non-critical applications e.g. non-hazardous systems; they are not suitable for highly erosive or corrosive systems.

ANSI B16.5 Socket Weld Flange Material Specification

Adhering to the latest global benchmarks as of 2025, Shribhairav Forge's socket weld flanges conform to rigorous standards that guarantee interoperability and safety. Our production aligns with ASME B16.5 for nominal pipe sizes up to 24", extending to B16.47 Series A and B for larger diameters, ensuring compatibility across international projects.

Key Dimensional and Pressure Specifications

Dimensions: ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings

Size Range: 1/2″ (15 NB) to 48″ (1200NB)

Pressure Classes: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.

DIN Standards: DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673

BS Standards: BS4504 , BS4504, BS1560, BS10

Flange Face Types: Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

These specs are validated through our in-house hydrostatic testing (up to 1.5x rated pressure) and dimensional verification using CMM (Coordinate Measuring Machines). For 2025 updates, we've incorporated ASME's revised tolerances for high-temperature deviations, ensuring slip on flanges perform flawlessly in fluctuating environments.

Specification	Class 150	Class 300	Class 600	Notes
Max Pressure (bar)	19.6	51.7	103.4	At 38°C ambient
Min Thickness (mm, 6″ size)	9.5	14.3	22.2	Per B16.5
Bolt Circle Dia. (mm, 4″)	114.3	152.4	190.5	8 holes standard
Weight (kg, 4″ CS)	1.6	2.3	4.1	Varies by material

Flanges	Flanges
Socket Weld Raised Face Flange	Raised Faced Socket Weld Flanges
ANSI B16.5 Socket Weld Flanges	Socket Weld Flange Dimensions
ASME B16.5 SWRF Flanges	ANSI B16.5 Class 150 Socket Weld Raised Face Flanges
Stainless Steel Socket Weld Flanges Suppliers	SS Socket Weld Flange
Socket Weld Flanges Dealer	ASME B16.45 SWRF Flanges Exporter
ANSI B16.5 class 150 SWRF Flange Stockholder	ANSI 150 Socket Weld Flange Distributors
Carbon Steel Socket Weld Flange	High Quality SWRF Flanges Manufacturer
ASTM A182 Stainless Steel SWRF Flange	Duplex Steel Socket Weld Flange
Super Duplex Steel Socket Weld Forged Flange	Copper Nickel Socket Weld Flanges SWRF
High Nickel Alloy SWRF Flanges	Hastelloy Socket Weld Flanges Stockist
Titanium ASME B16.5 SWRF Flanges	Inconel Socket Weld Flanges

Materials and Grades of Socket Weld Flanges

Stainless Steel Socket Weld Flanges : ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Socket Weld Pipe Flanges : ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Low Temperature Carbon Steel Socket Weld Flanges : ASTM A350, LF2, LF3

Carbon Steel Socket Weld Flanges : ASTM A105, A105N, A105M

Alloy Steel Socket Weld Flanges : ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91

Copper Alloy Steel Socket Weld Flanges : ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Socket Weld Pipe Flanges : ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020)

Advantages of Using Socket Weld Flanges

Advantage	Description
1. High Structural Integrity	Socket Weld Flanges provide a robust and secure joint capable of withstanding high pressure and mechanical stress, ensuring reliable long-term performance.
2. Suitable for Small Bore Piping	Socket Weld Flanges Ideally designed for small-diameter pipelines (typically up to 2” NB), where precise alignment and compact connections are required.
3. No End Preparation Required	When using SWRF Flange Pipe ends do not require beveling prior to welding, reducing fabrication time and overall installation cost.
4. Enhanced Flow Characteristics	The pipe end sits flush within the socket, ensuring smooth bore alignment, minimizing flow restriction, and reducing pressure drop across the joint.
5. Simplified Installation and Inspection	The single external fillet weld simplifies assembly and visual inspection, improving efficiency during fabrication and maintenance.
6. Superior Leak-Tightness	The recessed socket design provides excellent sealing capability, making it suitable for high-pressure, high-temperature, and critical service applications.
7. Economical for High-Pressure Small Lines	Socket Weld Flanges Offers a cost-effective solution for small-bore, high-pressure systems due to minimal welding requirements and reduced alignment effort.

DIMENSIONS OF ANSI B16.5 SOCKET WELD FLANGES

DIMENSION OF ANSI B16.5 FLANGES CLASS 150 LBS

Nominal Pipe Size	Nominal Pipe Size	Flange Dia O	Dia of Bolt Circle A	Dia of Bolt Holes D	No. of Holes	Thk of Flange C	Dia of Hub E	S/O & S/W Y	W/N Y	L/J Y	S/O & S/W B	L/J B	Dia of R/F R	Depth of Socket F
NB	INCH	MM	MM	MM	MM	MM	MM	LENGTH MM	LENGTH MM	LENGTH MM	BORE MM	BORE MM	MM	MM
15	1/2	88.9	60.3	15.9	4	11.1	30.2	15.9	47.6	15.9	22.3	22.9	34.9	9.5
20	3/4	98.4	69.8	15.9	4	12.7	38.1	15.9	52.4	15.9	27.7	28.2	42.9	11.1
25	1	107.9	79.4	15.9	4	14.3	49.2	17.5	55.6	17.5	34.5	35.0	50.8	12.7
32	1 1/4	117.5	88.9	15.9	4	15.9	58.7	20.6	57.1	20.6	43.2	43.7	63.5	14.3
40	1 1/2	127.0	98.4	15.9	4	17.5	65.1	22.2	61.9	22.2	49.5	50.0	73.0	15.9
50	2	152.4	120.6	19.0	4	19.0	77.8	25.4	63.5	25.4	62.0	62.5	92.1	17.5
65	2 1/2	177.8	139.7	19.0	4	22.2	90.5	28.6	69.8	28.6	74.7	75.4	104.8	19.0
80	3	190.5	152.4	19.0	4	23.8	107.9	30.2	69.8	30.2	90.7	91.4	127.0	20.6
100	4	228.6	190.5	19.0	8	23.8	134.9	33.3	76.2	33.3	116.1	116.8	157.2	23.8
125	5	254.0	215.9	22.2	8	23.8	163.5	36.5	88.9	36.5	143.8	144.5	185.7	23.8
150	6	279.4	241.3	22.2	8	25.4	192.1	39.7	88.9	39.7	170.7	171.4	215.9	27.0
200	8	342.9	298.4	22.2	8	28.6	246.1	44.4	101.6	44.4	221.5	222.2	269.9	31.7
250	10	406.4	361.9	25.4	12	30.2	304.8	49.2	101.6	49.2	276.3	277.4	323.8	33.3
300	12	482.6	431.8	25.4	12	31.8	365.1	55.6	114.3	55.6	327.1	328.2	381.0	39.7
350	14	533.4	476.2	28.6	12	34.9	400.0	57.1	127.0	79.4	359.1	360.2	412.7	41.3
400	16	596.9	539.7	28.6	16	36.5	457.2	63.5	127.0	87.3	410.5	411.2	469.9	44.4
450	18	635.0	577.8	31.7	16	39.7	504.8	68.3	139.7	96.8	461.8	462.3	533.4	49.2
500	20	698.5	635.0	31.7	20	42.9	558.8	73.0	144.5	103.2	513.1	514.3	584.2	54.0
600	24	812.8	749.3	34.9	20	47.6	663.6	82.5	152.4	111.1	615.9	615.9	692.1	63.5

ANSI B16.5 Socket Weld Flanges Application

ASME B16.5 Socket Weld Flange are known to deliver exceptional performance and are generally developed for meeting the demands. We offer a broad range of Socket Weld Flanges through a worldwide network of stock-keeping branches. These Slip On Flange is use in various industries like :

Stainless Steel Socket Weld Flanges uses in Oil and Gas Pipeline
Socket Weld Raised Face Flanges uses in Chemical Industry
Alloy Steel Socket Weld Flanges uses in Plumbing
Socket Weld Flanges uses in Heating
Socket Weld Flanges uses in Water Supply Systems
ANSI B16.5 Socket Weld Forged Flanges uses in Power Plant
Socket Weld Flanges uses in Paper & Pulp Industry
Socket Weld uses in Food Processing Industry

Flanges	Description	Uses / Applications	Advantages	Disadvantages
Slip-On Flange	The pipe is inserted into the flange bore and fillet welded from both inside and outside.	Low-pressure pipelines, cooling water systems, fire-fighting lines, and general service pipelines.	Easy to align and install. Economical and widely available. Suitable for low-temperature applications.	Lower fatigue strength.Not suitable for high-pressure or cyclic loads.Requires double welding (inside and outside).
Socket Weld Flange	The pipe is inserted into a socket and fillet welded around the outer edge.	High-pressure, small-bore piping in chemical plants, hydraulic lines, and steam systems.	Provides a smooth bore for better flow.Stronger than Slip-On due to socket support.Good fatigue strength.	Limited to small pipe sizes (≤ 2”).Crevice may form between pipe and flange, causing corrosion.More difficult to inspect welds.
Threaded Flange (Screwed Flange)	The flange has internal threads that screw onto a threaded pipe, no welding required.	Temporary or maintenance connections, air and water services, explosive areas where welding is unsafe.	Easy to assemble and dismantle.No welding needed (ideal for flammable environments).Simple installation.	Not suitable for high-pressure or high-temperature service.Threads can corrode or leak over time.Requires precise threading.
Weld Neck Flange	Has a long tapered hub and is butt-welded to the pipe for a smooth stress transition.	High-pressure and high-temperature pipelines, oil & gas, petrochemical, and power generation systems.	Highest strength and integrity.Excellent stress distribution.Ideal for critical and corrosive services.Prevents leakage under repeated stress.	Higher cost and installation time.Requires skilled welding and precise alignment.

FAQs

What is a Socket Weld Flange?

A socket weld flange is a type of pipe flange designed for small-diameter, high-pressure piping systems. The pipe is inserted into the socket end of the flange and then fillet welded around the joint, ensuring a strong and leak-proof connection.

What are the advantages of using socket weld flanges?

Socket weld flanges provide excellent fatigue strength, easy alignment during installation, and high leak resistance. They are ideal for systems handling high pressure, high temperature, or toxic fluids.

What materials are socket weld flanges available in?

Socket weld flanges are commonly manufactured in stainless steel, carbon steel, alloy steel, and duplex steel. Material choice depends on the application, operating pressure, and temperature requirements.

In which industries are socket weld flanges used?

Socket weld flanges are widely used in oil & gas, petrochemical, power generation, shipbuilding, and water treatment industries—especially in pipelines carrying steam, gas, or corrosive fluids.