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Flanges

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Weld neck Flanges


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ASME/ANSI B16.5 WELD NECK (WN) PIPE FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY WELD NECK FORGED FLANGES
CARBON, ALLOY, STAINLESS STEEL WELD NECK FLANGES

We offer immediate delivery programs for standard size of carbon steel weld neck flanges and stainless steel weld neck flanges.

Weld neck pipe flanges are connected to the pipe by welding the pipe to the neck of the pipe flange, which helps to pass on the stress from the weld neck to the pipe itself. This also reduces high stress concentration at the base of the hub of the weld neck pipe flanges. Weld neck pipe flanges are generally used in high pressure applications, where hot or cold temperatures exist. The inside diameter of a weld neck pipe flange is machined to match the inside diameter of the pipe.

We offer weld neck pipe flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.

Stainless Steel Weld Neck (WN) Flange

Stainless Steel Weld Neck (WN) Flange

Alloy-Steel, Carbon-Steel Weld Neck (WN) Flange

Alloy Steel, Carbon Steel Weld Neck (WN) Flange

1-Weld Neck Flange | 2-Butt Weld | 3-Pipe or Fitting

1-Weld Neck Flange | 2-Butt Weld | 3-Pipe or Fitting

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Weld Neck Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Weld Neck Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Weld Neck Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Weld Neck Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Technical Information – Specifications, Dimensions Weld Neck Flanges

  • ANSI/ASME B16.5 Welding Neck Flange 150lb
  • ANSI/ASME B16.5 Welding Neck Flange 300lb
  • ANSI/ASME B16.5 Welding Neck Flange 400lb
  • ANSI/ASME B16.5 Welding Neck Flange 600lb
  • ANSI/ASME B16.5 Welding Neck Flange 900lb
  • ANSI/ASME B16.5 Welding Neck Flange 1500lb
  • ANSI/ASME B16.5 Welding Neck Flange 2500lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 75lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 150lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 300lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 600lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 400lb
  • ANSI/ASME B16.47 Series B Weld Neck Flange 900lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 150lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 300lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 400lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 600lb
  • ANSI/ASME B16.47 Series A (MSS SP44) Weld Neck Flange 900lb

Slip-On Flanges

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ASME/ANSI B16.5 SLIP-ON (SO) PIPE FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY SLIP-ON FORGED FLANGES
CARBON, ALLOY, STAINLESS STEEL SLIP-ON FLANGES

We offer immediate delivery programs for standard size of carbon steel slip-on flanges and stainless steel slip-on flanges. Slip-on flanges manufactured in special stainless steel grades, nickel alloy and alloy steel can be supplied with just in time programs.

Slip-on pipe flange usually slips over the pipe. Slip-on pipe flanges are typically made with an inside diameter of the pipe flange slightly larger than the outside diameter of the pipe. This allows the slip-on flange to slip over the pipe. Slip-on pipe flanges are welded (usually both inside and outside) to provide strength and prevent leakage. Slip-on pipe flanges can sometimes also have a boss/ring or hub, and can be made with a bore to suit either pipe or tube. Ring pipe flanges and hub pipe flanges are both considered slip-on pipe flanges because they both slip over the pipe.

Slip-on flanges are generally preferred by users over weld neck flanges, as they are a cheaper option than weld neck flange and the fact that less accuracy is required when cutting pipe to length.

Slip-on flanges are available with raised, flat or RTJ faces, and are also available in orifice configurations.

We offer slip-on pipe flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.

Slip-on Flange, SO Forged Flanges Production Range

Stainless Steel Slip-On (SO) Flange

Stainless Steel Slip-On (SO) Flange

Alloy Steel, Carbon Steel Slip-On (SO) Flange

Alloy Steel, Carbon Steel Slip-On (SO) Flange

1-Slip On flange | 2-Filled weld outside | 3-Filled weld inside | 4-Pipe

1-Slip On flange | 2-Filled weld outside | 3-Filled weld inside | 4-Pipe

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Slip-on Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Slip-on Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Slip-on Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Slip-on Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Blind Flanges

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ASME/ANSI B16.5 BLIND (BL) PIPE FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY BLIND FORGED FLANGES
CARBON, ALLOY, STAINLESS STEEL BLIND FLANGES

We offer immediate delivery programs for standard size of carbon steel blind flanges and stainless steel blind flanges. Plate blind flanges manufactured in special stainless steel grades, nickel alloy and alloy steel can be supplied with just in time programs.

Commonly referred as blanking flanges, Blind pipe flanges are widely used in high pressure applications. Blind flanges are generally used to seal the end of a piping system to prevent flow of liquids or gases. The use of blind flanges allows ease of access to a piping system once it has been closed.

Our blind flanges are available with raised or RTJ faces and also with female threads. Blind flanges can be supplied with or without hub as per the customer requirements.

We offer blind plate flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.


Blind Flanges, BL Forged Flanges Production Range

Stainless Steel Plate / Forged Blind Flange (BL)

Stainless Steel Plate/Forged
Blind Flange (BL)

Alloy Steel, Carbon Steel Plate/ Forged Blind Flange (BL)

Alloy Steel, Carbon Steel Plate/
Forged Blind Flange (BL)

1-Blind flange | 2-Stud Bolt | 3-Gasket | 4-Other flange

1-Blind flange | 2-Stud Bolt
3-Gasket | 4-Other flange

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Blind Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Blind Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Blind Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Blind Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Socket-Weld Flanges

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ASME/ANSI B16.5 SOCKET WELDING FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY SOCKET WELDING FLANGES
CARBON, ALLOY, STAINLESS STEEL SOCKET WELD FLANGES

We offer immediate delivery programs for standard size of carbon steel socket weld flanges and stainless steel socket weld flanges. Socket welding flanges manufactured in special stainless steel grades, nickel alloy and alloy steel can be supplied with just in time programs from stock.

Socket weld flange is similar to the slip-on flange in outline, but the bore is counter-bored to accept pipe. Socket welding pipe flanges are typically used on smaller sizes of high pressure pipes. Socket weld flanges are widely used in high pressure systems such as hydraulic equipment and steam lines. Socket weld pipe flanges are attached by inserting the pipe into the socket end and then applying fillet weld around the hub of the flange. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe. An optional internal weld may be applied in high stress applications.

We offer socket welding flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.


Socket Welding Flange, SW Forged Flanges, Socket Weld Flange Production Range

Stainless Steel Socket Welding Flange (SWRF)

Stainless Steel Socket Welding Flange (SWRF)

Alloy Steel, Carbon Steel Socket Welding Flange (SWRF)

Alloy Steel, Carbon Steel Socket Welding Flange (SWRF)

1-Socket Weld Flange | 2-Filled Weld | 3-Pipe | X-Expansion gap

1-Socket Weld Flange | 2-Filled Weld | 3-Pipe | X-Expansion gap

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Socket Welding Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

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: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Threaded Flanges

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ASME/ANSI B16.5 THREADED PIPE FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY THREADED FORGED FLANGES
CARBON, ALLOY, STAINLESS STEEL THREADED/SCREWED FLANGES

We offer immediate delivery programs for standard size of carbon steel threaded flanges and stainless steel threaded flanges.
Threaded flanges are widely used in low pressure piping systems, as no welding is involved while connecting the flanges to pipes or other equipment. However, the flange may be welded around the joint after assembly, but it is not considered a satisfactory method of increasing its applications. Threaded flanges are also known as screwed flanges and are similar to slip-on flanges, but the bore is threaded to enable assembling without welding. Threaded pipe flanges are usually used with pipes that have external threads.

We offer threaded pipe flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.


Threaded Flange, Threaded Forged Flanges, Screwed Flanges Production Range

Stainless Steel Threaded Flange - Threaded Flanges Manufacturer

Stainless Steel Threaded Flange

Alloy Steel, Carbon Steel Threaded Flange - Manufacturer

Alloy Steel, Carbon Steel Threaded Flange

1-Threaded flange | 2-Thread | 3-Pipe or Fitting - Manufacturer of Threaded Flanges

1-Threaded flange | 2-Thread | 3-Pipe or Fitting

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Threaded Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Threaded Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Threaded Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Threaded Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Lap Joint Flanges

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ASME/ANSI B16.5 LAP JOINT PIPE FLANGES

MANUFACTURER/EXPORTER OF HIGH QUALITY LAP JOINT (LJ) FORGED FLANGES
CARBON, ALLOY, STAINLESS STEEL LAP JOINT FLANGES

We offer immediate delivery programs for standard size carbon steel lap joint flanges and stainless steel lap joint flanges. Lap joint flanges manufactured in carbon steel, special stainless steel grades, nickel alloy and alloy steel can be supplied with just in time programs.

Lap Joint Flanges are similar to other types of industrial flanges, but it does not have a raised face. Lap joint flanges are used in conjunction with a “Lap Joint Stub End”. The total initial cost of a lap joint flange along with a stub end is around one-third higher than that of comparable welding neck flanges. The pressure holding capacity of lap joint flanges is comparatively lower, and the fatigue life for the assembly is only one tenth that of welding neck flanges.

The lap joint flange with the stub end assembly is normally used in piping systems which require regular dismantling for inspection and cleaning. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).


Benefits of using lap joint flanges:

  • Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
  • Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
  • In systems which erode or corrode quickly, the flanges may be salvaged for re-use.

We offer lap joint flanges manufactured at our facility to companies in various industries including shipbuilding, power generation, petrochemical plants, oil refineries, waste water treatment plants, paper mills, pharmaceutical plants and turnkey projects among others.


Lap Joint Flanges, LJ Forged Flanges Production Range

Stainless Steel Lap Joint Flange

Stainless Steel Lap Joint Flange

Alloy Steel, Carbon Steel Lap Joint Flange

Alloy Steel, Carbon Steel Lap Joint Flange

1-Lap Joint Flange | 2-Stub End | 3-Butt weld | 4-Pipe or Fitting

1-Lap Joint Flange | 2-Stub End | 3-Butt weld | 4-Pipe or Fitting

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 Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Lap Joint Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Lap Joint Flanges: ASTM A182 F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Lap Joint Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Lap Joint Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customised Flanges

Screwed Flanges

Screwed Flanges

Screwed (threaded) flanges are pipe flanges joined by screwing onto externally threaded pipes. They provide a secure connection without welding, making them ideal for low-pressure, low-temperature, or hazardous environments where welding is unsafe. Commonly used in plumbing, fire protection, and industrial systems, these flanges are easy to assemble and disassemble for maintenance. Available in materials like carbon steel, stainless steel, and alloys, they conform to standards such as ASME B16.5 and ASTM specifications. Though convenient, threaded connections are not recommended for high-pressure or vibrating systems due to potential leakage and thread wear.


Standard Specifications

Standard Description Applicable Materials
ASME B16.5 Flanges and Flanged Fittings – Pipe sizes NPS ½” to 24” Carbon steel, stainless steel, alloy steel
ANSI B1.20.1 Standard for pipe threads (NPT – National Pipe Thread Taper) Threaded flange connections
ASTM A105 Standard for forged carbon steel piping components Carbon steel
ASTM A182 Standard for forged stainless and alloy steel flanges Stainless steel, alloy steel
EN 1092-1 European standard for flanges Various steels

Dimension:-
NPS (inches) Outside Diameter (OD) (mm) Bolt Circle Diameter (mm) No. of Bolts Bolt Size Flange Thickness (mm)
½ 90 60.3 4 ½" 11.2
1 110 76.2 4 ½" 12.7
2 150 120.7 4 ⅝" 15.9
3 190 152.4 4 ⅝" 19.1
4 230 190.5 8 ⅝" 23.9
6 280 241.3 8 ¾" 25.4
8 345 298.5 8 ¾" 28.4
10 405 362.0 12 ⅞" 30.2
12 485 431.8 12 ⅞" 31.8

Pressure Ratings

Screwed flanges are typically available in the following pressure classes:

  • Class 150
  • Class 300
  • Class 600

Higher pressure classes are less common and often not recommended due to limitations of threaded connections.

Plate Flanges

Plate Flanges

ASME/ANSI B16.5 PLATE FLANGES (SLIP-ON)

MANUFACTURER/EXPORTER OF HIGH QUALITY PLATE SLIP-ON FLANGES
CARBON, ALLOY, STAINLESS STEEL PLATE FLANGES
Stainless Steel Plate Flange Manufacturer/Exporter/Supplier

Stainless Steel Plate Flange

We offer immediate delivery programs for standard size carbon steel and stainless steel plate flanges. Plate flanges can also be manufactured as per custom size requirements of our customers.

Stainless steel plate flanges are manufactured from plates produced according to ASTM A240 and ASME SA240 standards. Plate flanges are widely accepted as an alternative to cast or forged flanges in low pressure applications due to the benefits listed below.

Advantages of Plate Flanges
  • Free of any defects
  • Superior grain structure compared to forged or cast products
  • Extended service life
  • Reduction of normal maintenance costs

Plate Flange, Slip-on Plate Flanges Production Range

Size: 1/2” (15 NB) to 48” (1200 NB), Custom Sizes

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

Pressure Ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 | PN6, PN10, PN16, PN25, PN40, PN64 etc.

Carbon Steel Plate Flanges: ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8

Stainless Steel Plate Flanges: ASTM A182, A240 – F202, F304/304L/304H, F316/316L, F316H, F316TI, F310, F321, F904L

Alloy Steel Plate Flanges: ASTM A182 F1, F5, F9, F11, F22, F91

Special Alloy Plate Flanges: Duplex, Super Duplex, Nickel Alloys

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

Coating/Surface Treatment: Antirust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Value Added Services: CNC Machining, Customized Flanges