Weld Neck Flange

Key Features

Weld Neck Flanges are one of the most commonly used flanges in high-pressure piping systems due to their superior strength and structural integrity. These flanges are designed with a long tapered hub that provides excellent reinforcement and helps in reducing stress concentration at the base of the flange. The gradual transition from flange thickness to pipe thickness ensures smooth flow of fluids and minimizes turbulence and erosion at the joint.

SAKSHI FORGE manufactures premium quality Weld Neck Flanges using advanced forging techniques and high-grade stainless steel materials. These flanges are widely used in industries such as oil & gas, petrochemical plants, power generation, refineries, and marine applications where high pressure and extreme temperatures are involved.

The inside diameter of the weld neck flange is machined to match the inside diameter of the pipe, ensuring unrestricted flow and improved efficiency. These flanges are butt-welded to the pipe, providing a strong and leak-proof connection. Due to their design, Weld Neck Flanges are highly resistant to pressure fluctuations, thermal expansion, and cyclic loading conditions.

Our Weld Neck Flanges are available in various sizes, pressure classes, and face types. They undergo strict quality control checks and are manufactured in compliance with international standards to ensure durability, reliability, and long service life.

Type

Weld Neck Flange

Standards

ASME B16.5, ASME B16.47, ASTM A182

Size

½” NB to 48” NB

Pressure Ratings

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

Face Type

RF, FF, RTJ

Manufacturing

Forged

Surface Treatment

Anti-rust Oil, Pickling, Passivation

Tolerances

As per ASME B16.5

(Custom hub length and dimensions available on request)

Stainless Steel
ASTM A182 F304, F304L, F316, F316L, F321, F310, F347, F904L

Duplex Steel
UNS S31803, S32205

Super Duplex Steel
UNS S32750, S32760

Nickel Alloys
Inconel 600, 625, Monel 400, Hastelloy C276

Standard: ASME B16.5

Size (NB)

OD (mm)

Bolt Circle (mm)

No. of Holes

Hub Dia (mm)

Thickness (mm)

½”

88.9

60.3

4

30.2

9.6

1”

108

79.4

4

38.1

11.2

2”

152

120.7

4

60.3

14.3

4”

229

190.5

8

114.3

23.9

6”

279

241.3

8

168.3

25.4

8”

343

298.5

8

219.1

28.6

10”

406

362

12

273

30.2

12”

483

431.8

12

323.9

31.8

(Custom sizes available on request)