Flanges
Precision Flanges

Leading Flanges Manufacturer in India – Exporting Globally

Kayon Forging Corporation (KAFCO) is one of India’s leading flange manufacturers, suppliers, and dealers. Based in India, we specialise in producing and exporting high-quality flanges. Whether you need flanges for automotive, aerospace, shipbuilding, or power plant industries, we are your trusted solution.

With a large inventory and years of experience, we have fulfilled many customer needs both in India and internationally. Our flanges come in various grades, diameters, and sizes to suit different requirements.

We are trusted flange suppliers in India and serve customers in the USA and the UK as well. Whether you’re looking for stainless steel flange suppliers in India or flange manufacturers in the USA and the UK, KAFCO Asia is your reliable partner.

MS Flanges Manufacturer & Exporter in India

We are a trusted stainless steel flanges manufacturer in India, offering a wide range of high-quality flanges, including SS flanges, MS flanges, copper flanges, and alloy flanges. As experienced carbon steel flanges manufacturers in India, we produce flanges that meet international standards, making them ideal for industries in the USA, UK, and other global markets. Whether you need durable stainless steel or carbon steel options, we ensure quality and reliability with every order.

From the careful selection of raw materials to precise manufacturing and thorough quality checks, our skilled team oversees every step of the process. We handle all aspects of production, packaging, and storage with utmost care to maintain product integrity. Efficient logistics and timely shipment ensure that our flanges reach clients worldwide safely and on schedule, supporting their operational needs without interruption.

Popular Types

Types Of Flanges

Flanges are available in various types like weld neck, slip-on, blind, and threaded etc. Each is designed for specific pressure, piping, and industrial application needs.

Weld Neck Flanges

Weld Neck Flanges

Slip on Flanges

Threaded Flanges

Socket Weld Flanges

Orifice Flanges

Reducing Flanges

Raised Face Flanges

Blind Flanges

Flat Face Flanges

RING Type Joint (RTJ) Flange

Industries We Serve

Applications & Uses of Flanges

Flanges are essential components in piping systems, used to connect pipes, valves, pumps, and other equipment while allowing easy access for cleaning, inspection, or modification. They provide a tight, secure seal that ensures leak-free performance under varying pressure and temperature conditions.

Depending on the type and material, flanges can be used in low-pressure environments or demanding high-pressure industrial systems. Their versatility, strength, and reusability make them a preferred choice for systems requiring frequent maintenance or modular assembly.

flanges-kept-in-a-wooden-box

Global Shipping & Logistics

Navigating global supply chains is our strength. We offer door-to-door international shipping, backed by a skilled logistics team that ensures smooth customs handling, timely delivery, and secure packaging for all orders, big or small.

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We ensure safe, timely, and efficient delivery across the globe with streamlined logistics and trusted shipping partners — no matter where you are.

Trusted Responses

Flanges FAQ's

Get easy answers to common questions about flanges, including their types, uses, standards, and tips to help you choose the right one for your needs.

Yes, flange dimensions follow international standards like ANSI, DIN, JIS, and ISO to ensure compatibility, though each standard has its own sizing and pressure classes.

Yes, but the flange material and gasket must be chosen based on the temperature range to prevent failure due to thermal expansion or contraction

Regular inspection for leaks, corrosion, and bolt tightness is key. Retighten bolts if necessary and replace gaskets during maintenance to maintain a secure seal.

Some flanges, like weld neck and RTJ types, are made to work well under high pressure. It’s important to pick flanges with the right pressure rating and material to keep your system safe and strong.

It’s usually not a good idea to reuse flanges because they can get bent or damaged, especially welded ones. To keep things safe and leak-free, it’s better to use new flanges.

Flange size generally matches the pipe diameter (nominal pipe size). Always verify dimensions with flange standards and consider pressure class and connection type. Call us for assistance!

Weld Neck Flanges

Welding neck flanges have a hub on the backside of the flange taper matching the pipe to be welded. The inside diameter of the flange is bored to match the mating pipe. This arrangement avoids turbulence in flow and prevents erosion. Stress is distributed well and there is no restriction of flow. 

Flanges

Standards / Specifications

Stainless Steel

ASTM A182, A240

Carbon Steel

ASTM A105, ASTM A181

Alloy Steel

ASTM A182

Size Range

1/8″ NB to 48″ NB

Class

150#, 300#, 400#, 600#, 900#, 1500#, 2500#

ANSI Standards

ANSI B16.5 (Class 150, 300, 600, 900, 1500), ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

DIN Standards

DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627–2638, DIN2673

BS Standards

BS4504, BS1560, BS10

Flanges

Grades

Stainless Steel

F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L

Duplex SS

UNS S31803, 2205

Super Duplex SS

UNS S32750

Alloy Steel

GR F1, F11, F22, F5, F9, F91

Nickel Alloys

Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276

Copper Alloys

Copper, Brass & Gunmetal

Slip on Flanges

Slip on flanges, as the name suggests, are slipped onto the pipe. They are industry favorites because the pipe line fitters find it easy to align them compared to weld neck flanges. The bore of the slip-on flanges of a given size matches the OD of the pipe. The flange is then fillet welded up around…

Slip on Flanges

Standards / Specifications

Stainless Steel

ASTM A182, A240

Carbon Steel

ASTM A105, ASTM A181

Alloy Steel

ASTM A182

Size Range

1/8″ NB to 48″ NB

Class

150#, 300#, 400#, 600#, 900#, 1500#, 2500#

ANSI Standards

ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

DIN Standards

IN2527, 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

Slip on Flanges

Grades

Stainless Steel

F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L

Duplex SS

UNS S31803, 2205

Super Duplex SS

UNS S32750

Alloy Steel

GR F1, F11, F22, F5, F9, F91

Nickel Alloys

Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276

Copper Alloys

Copper, Brass & Gunmetal

Threaded Flanges

In threaded flanges, threads are made in the inside of the flange matching to the threads on the pipe Pipes are screwed into the flanges. Sometimes the joints are seal welded to make them stronger and safer. They are not suitable for higher diameters because of the difficulty in machining proper threads and tightening the joint. They are used instead for smaller size pipes in low pressure services and also where welding is not allowed.

Threaded Flanges

Standards / Specifications

DIN Standards

DIN 2502, DIN 2503, DIN 2527, DIN 2565 / 2566, DIN 2573 / 2576, DIN 2627 / 2628, DIN 2629 / 2630, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635 / 2636, DIN 2637 / 2638, DIN 2641, DIN 2642, DIN 2655 / 2656, DIN 86029 / 86030

Socket Weld Flanges

Socket welding flanges are similar to slip-on flanges. They have a counter bore diameter on the hub end equal to the OD of the pipe on which they are used, and a bore diameter equal to the bore of the inside diameter of the pipe. This arrangement makes up a socket into which the pipe is inserted.

Socket Weld Flanges

Standards / Specifications

Stainless Steel

ASTM A182, A240

Carbon Steel

ASTM A105, ASTM A181

Alloy Steel

ASTM A182

Size Range

1/8″ NB to 48″ NB

Class

150#, 300#, 400 #, 600#, 900#, 1500# & 2500#.

ANSI Standards

ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

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

Socket Weld Flanges

Grades

Stainless Steel

F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L

Duplex SS

UNS S31803, 2205

Super Duplex SS

UNS S32750

Alloy Steel

GR F1, F11, F22, F5, F9, F91

Nickel Alloys

Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276

Copper Alloys

Copper, Brass & Gunmetal

Orifice Flanges

Orifice flanges are used in conjunction with flow metering systems. An orifice plate is made as per individual flow requirements and is inserted between two of these flanges.

These flanges are provided with tapped holes on the periphery of the flange to make connections for measuring the pressure drop in the flow through the orifice plate. These tappings are accurately made in the flanges with reference to the orifice plate. These flanges are generally available as weld neck in raised face or in RTJ in all classes and in all materials.

They also have jack screws on the flanges which allow separation of the flanges to change or inspect the orifice plate. They are usually supplied as a combination of both flanges and used as such. More often than not, these flanges are welding neck type. Nevertheless, inside welds should be ground smooth to avoid turbulence and false readings.

Orifice Flanges

Technical Specifications

Material

Stainless Steel

Sealing Surface

RF

Specification

PN16 TYPE01 8″

Structure

Flanges

Size

3/4″-60″

Reducing Flanges

Reducing flanges are standard flanges with a bore less than that of the main flange rating. They are used for reducing the line size of the piping. For instance, a 4” by 3” Class 150 flange will have flange dimensions and drillings of a 4” flange and bore size of 3” pipe. These flanges are also used in jacketed or gutted piping. They are available in all classes, in all materials and types.

Reducing Flanges

Specifications

Standards

BS 4504 (Code 105)

Features

Durable, Dimensionally accurate, High tensile strength, Corrosion resistant, Easy to install

Material Options

Aluminum, Brass, Bronze, Copper, Hardened Metals

Turning Capacity

Diameter: 0.05mm–300mm; Length: 0.5mm–750mm

Manufacturing Process

CNC Machining, EDM, Wire Cutting (W/C)

Raised Face Flanges

The most commonly used flange is a raised face flange. In this flange, the gasket surfaces are raised above the rest of the face by about .060” or .250” depending on the pressure class of the flange (see Figures 7.9A and 7.9B). The pressure rating of the flange standardizes the height of the raised face.

The finish of these flanges may be either phonographic serrated or concentric serrated. The most popular and standard finish is phonographic. Raised face flanges use a gasket that fits inside the bolts. The raised face of these flanges concentrates more pressure on a smaller gasket area and thereby adopts a higher gasket load on the joint. It is now advantageous to use a ring gasket, which encircles the inside of the bolt circle diameter.

Traditionally, asbestos gaskets are used, but the industry is fast changing over to environmentally friendly materials. Spiral wound gaskets are the norm. More details of these gaskets can be found in Chapter 12, Gaskets. Raised face flanges are available in all materials except for cast flanges. In the case of cast flanges, the entire face of the flange has the same surface, i.e., flat.

Raised Face Flanges

Specifications

Features

Robust construction, corrosion resistance, high durability, resistant to multiple fluids, abrasion distortion resistance, better flow characteristics, optimum performance, eco-friendly

Size Range

15 NB to 600 NB

Pressure Ratings

150 LBS, 300 LBS, 400 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

TABLE ratings

2.5, 6, 10, 16, 25, 40, 64, 160, 320, 400

Available Forms

Slip On, Socket Weld, Blind, Lapped, Screwed, Weld Neck, Reducing, Spectacle, Slip On Boss, Plate, Plate Blank, Screwed Boss

Raised Face Flanges

Grades

Carbon Steel

ASTM / ASME A105, ASTM / ASME A350 LF2

Alloy Steel

ASTM / ASME A182 GR F5, F9, F11, F12, F22, F91

Blind Flanges

Blind flanges are just that. They are without a bore and are used to close or seal the end of the pipe lines. They are made in all classes and types, with or without a hub. They are deliberately fixed on the end of some lines which are required to be opened frequently for cleaning or unplugging. These are also used as covers for pressure vessels normally known as man ways or manholes.

It must be understood that blind flanges are subjected to more stresses than any other type of flange. Blind flanges sometimes have a provision for threaded tappings for instrument connections or sampling take-offs.

These flat face steel blind flanges are used to blank off pipelines, valves and pumps, it can also be used as an inspection cover. Blind flange is sometimes referred to as a blanking flange. Experienced professionals are engaged with us who fabricate these flanges with excellent precision. We are recognized blind flanges manufacturer.

Blind Flanges

Standards / Specifications

Standards (ANSI)

ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

Standards (DIN)

DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673

Standards (BS)

BS4504, BS1560, BS10

Size Range

1/8″ NB to 48″ NB

Pressure Ratings

ANSI B16.5 Class 150, 300, 600, 900, 1500, 2500

Blind Flanges

Grades

Stainless Steel

ASTM A182, A240; F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex SS

UNS S31803, 2205

Super Duplex SS

UNS S32750

Carbon Steel

ASTM A105, ASTM A181

Alloy Steel

ASTM A182 GR F1, F11, F22, F5, F9, F91

Nickel Alloys

Monel 400 & 500, Inconel 600 & 625, Incolloy 800 & 825, Hastelloy C22 & C276

Copper Alloys

Copper, Brass, Gunmetal

Flat Face Flanges

The flat face or full-face flange has no machined step on the gasket surface and is generally made without any serrations. Flat face flanges are found in the cast flanges like cast iron or bronze, mostly on the pump flanges and cast-iron pipelines. But the problem arises when the flanges are to be mated with a raised face flange, which is an industry norm for steel piping.  If the flanges are joined as they are now, the cast flange may break because it tends to bend into the gap caused by the raised face.

Differences in height along the flange face can exert undue stress on the cast flanges and can even break the castings when bolted up. To avoid this problem in such a necessity, the raised face must be machined out flat before joining and a full-face gasket should be used.

A gasket should cover the entire face of the flange. But connecting a raised face flange to flat face that is either steel or stainless steel should not pose any problem because materials of equal strength are used.

Flat Face Flanges

Specifications

Material Form Available

Tube, pipe, sheet, plate, coupling, pipe fitting, butt weld fitting, flange, filler wire, welding rod, seamless pipe, forging hex, circle, patta, patti, angle, heavy thickness pipe, forged fitting, round bar, hexagonal, square, square pipe, rectangle pipe.

Stainless Steel & Alloys Grades

304, 304L, 316, 316L, 316Ti, 321, 303, 202, 410, 420, 430, 430F, 431, 446, 316H, 304H, Inconel 600, Inconel 800, Duplex, 904L, 310, Hastelloy A/B/C, Monel, Titanium, 347

Ring Type Joint (RTJ) Flanges

Ring type flanges and joints were originally developed to meet the demands of the petroleum and petrochemical industries. They offer a very good metal-to-metal seal in high temperature and pressure applications. The gasket in these flanges is a metal ring with a suitable profile. These flanges have a matching groove cut on their flange faces as per standard dimensions. When the bolts are tightened, the metal gasket compresses into the mating grooves of both the flanges and makes a tight metal-to-metal joint. Joints are robust, and assembly and disassembly are easy.

API ring joint gaskets are generally available in two basic designs: oval and octagonal cross section. Flange grooves are made correspondingly. Octagonal cross sections are preferred because of their higher sealing efficiency. Flange grooves must be finished to 63 micro inches and must be cleaned of all burrs, chatter marks, and foreign material before insertion of the ring. They act as a seal due to the wedging forces and the initial line contact. Needless to say, those gaskets should be a bit softer than the companion flanges. 

Ring Type Joint (RTJ) Flanges

Specifications

Size Range

½″ NB to 60″ NB

Types Available

Weld Neck (WNRF), Socket Weld (SWRF), Slip On (SORF), Blind (BLRF), Lap Joint, Screwed (Threaded), Long Weld Neck, Reducing, Spectacle Blind, Ring Joint, Large Diameter Ring, Orifice, Girth Flange.

Ring Type Joint (RTJ) Flanges

Dimensions Standard / Pressure Ratings:

ANSI / ASME

B16.5, B16.20

API

API 6A, API 605

Standards

MSS-SP-44, BS3293

BS10

Table D, E, F & H

DIN

PN6, PN10, PN16, PN25, PN64

Pressure Classes

150lb to 2500lb