Weld Neck Flanges

Weld Neck Flanges are among the most reliable and commonly used types of flanges in the piping industry, known for their high strength, structural integrity, and leak-proof connections under extreme temperature and pressure conditions. At Grafton Pipe Fittings, we manufacture and supply premium-grade Weld Neck Flanges in various materials, including ASTM A105 for carbon steel and ASTM A182 F304, A182 F316 for stainless steel variants, catering to multiple industrial applications such as oil & gas, petrochemical, power generation, and shipbuilding.

Our Weld Neck Flanges feature a long tapered hub that offers excellent reinforcement to the flange-pipe joint, making them ideal for high-pressure environments. Designed to meet stringent industry norms, we offer flanges that comply with universal standards such as ASME B16.5, ANSI B16.47, MSS SP-44, and EN 1092-1. Each flange is available with heat numbers and accompanied by a Mill Test Certificate (MTC), ensuring full traceability and quality assurance.

Grafton Pipe Fittings offers a wide dimensional range of Weld Neck Flanges from ½” NB to 48” NB in pressure ratings of Class 150 to Class 2500. These flanges are precision-engineered and machined to provide a perfect match with the pipe bore, reducing turbulence and erosion inside the pipeline. For stainless steel options, our flanges are available in grades such as ASTM A182 F304 (UNS S30400), ASTM A182 F316 (UNS S31600), and for carbon steel, ASTM A105 (UNS K03504), all of which are designed to deliver long-lasting performance even in the most corrosive environments.

Weld Neck Flanges are often referred to by several industry terms and standards, helping users find products relevant to their needs. These include terms like raised face weld neck flange, RTJ weld neck flange, long weld neck flange, and standards such as ASTM A105N, A182 F304L, A182 F316L, ASME B16.5 Class 150 Flange, DIN 2633, and BS 4504. Their popularity is evident from high user intent searches like “SS weld neck flange S30400,” “carbon steel WNRF flange K03504,” and “ANSI B16.5 F316 RTJ flange.”

Specification Of Weld Neck Flanges

Specification	ASTM A182 / B564 / A105 / A350 / A694 / B381
Dimension Standard	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Standard	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Size	1/2" (15 NB) to 48" (1200 NB)
Class / Pressure	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64, etc.
Flange Face Type	Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
DIN Flanges	DIN 2527, 2566, 2573, 2576, 2641, 2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637, 2638, 2673
JIS Flanges	JIS B2220 5K, JIS B2220 10K, JIS B2220 16K, JIS B2220 20K
BS Flanges	BS4504 PN 6, BS4504 PN 10, BS4504 PN 16, BS4504 PN 25, BS4504 PN 40, BS4504 PN 64, BS4504 PN 100, BS4504 PN 160, BS4504 PN 250, BS 10, BS Table D, BS Table E, BS Table F, BS Table H.
Stainless Steel Weld Neck Flanges	304, 304L, 304H, 310S, 316, 316L, 316H, 316Ti, 317/317L, 321/321H, 347/347H, 904L, 446
Duplex Steel Weld Neck Flanges	S31803 F51, S32205 F60
Super Duplex Steel Weld Neck Flanges	S32750, S32760
Carbon Steel Weld Neck Flanges	A105, LF2, IS 2062, F42, F46, F52, F60, F65, F70
Alloy Steel Weld Neck Flanges	F1, F5, F9, F11, F12, F22, F91
High Nickel Alloy	200, 201, 400, K500, 600, 601, 625, 718, 800, 825, C22, C276, B2, X
Alloy 20 Weld Neck Flanges	Alloy 20

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