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Weld Neck

Stainless Steel Weld Neck Flanges – EN1092-1 & ANSI B16.5

Integraflow supplies stainless steel weld neck flanges in 304 (1.4301) and 316L (1.4404) grades, manufactured to both EN1092-1 and ANSI/ASME B16.5 standards with pressure ratings from PN6 to PN40 and 150lb to 1500lb, providing a high-strength, welded connection solution for critical applications in industrial, hygienic, and process pipework systems.

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Weld Neck

DN150 (6 NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
Contact us for pricing 0.0 GBP
DN150 (6" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
Contact us for pricing 0.0 GBP
DN150 (6" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
£ 1,621.76 1621.76 GBP
DN150 (6" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
Contact us for pricing 0.0 GBP
DN150 (6" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
£ 1,745.73 1745.73 GBP
DN150 (6" NB) SCHEDULE 80S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 279.4mm
Flange thickness (C): 25.4mm
Hub length (X): 190.5mm
Neck height (A): 241.3mm
Pitch circle diameter (K): 241.3mm
Hub base diameter (Y): 88.9mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 215.9mm
Number of bolt holes: 8
Material: Stainless Steel 304
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
Contact us for pricing 0.0 GBP
DN150 (6" NB) SCHEDULE 80S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 279.4mm
Flange thickness (C): 25.4mm
Hub length (X): 190.5mm
Neck height (A): 241.3mm
Pitch circle diameter (K): 241.3mm
Hub base diameter (Y): 88.9mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 215.9mm
Number of bolt holes: 8
Material: Stainless Steel 316
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
Contact us for pricing 0.0 GBP
DN150 (6" NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 317.5mm
Flange thickness (C): 36.5mm
Hub height (X): 206.2mm
Length through hub (A): 168.4mm
Bolt circle diameter (K): 269.7mm
Overall height (Y): 108.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 215.9mm
Number of bolt holes: 8
Bolt hole diameter: 22.3mm
Approx. weight: 20.2kg
Contact us for pricing 0.0 GBP
DN200 (8 NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 304.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 10S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: 304 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 809.90 809.9 GBP
DN200 (8" NB) SCHEDULE 10S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: 316 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 1,288.63 1288.63 GBP
DN200 (8" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 304.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 316.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 40S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: 304 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 1,202.67 1202.67 GBP
DN200 (8" NB) SCHEDULE 40S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: 316 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 1,060.64 1060.64 GBP
DN200 (8" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 304.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 316.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 80S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: Stainless Steel 304
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 80S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 342.9mm
Flange thickness (C): 28.6mm
Hub length (X): 241.3mm
Neck height (A): 293.1mm
Pitch circle diameter (K): 298.4mm
Hub base diameter (Y): 108.0mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 269.7mm
Number of bolt holes: 8
Material: Stainless Steel 316
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
Contact us for pricing 0.0 GBP
DN200 (8" NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 381.0mm
Flange thickness (C): 41.1mm
Hub height (X): 260.3mm
Length through hub (A): 219.2mm
Bolt circle diameter (K): 316.8mm
Overall height (Y): 111.2mm
Raised face thickness (RF): 1.5mm
Bore (B): 269.7mm
Number of bolt holes: 12
Bolt hole diameter: 25.4mm
Approx. weight: 31.0kg
Contact us for pricing 0.0 GBP
DN250 (10 NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 10S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 406.4mm
Flange thickness (C): 30.2mm
Hub length (X): 304 Stainless Steel.8mm
Neck height (A): 273.0mm
Pitch circle diameter (K): 361.9mm
Hub base diameter (Y): 101.6mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 323.8mm
Number of bolt holes: 12
Material: 304 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 2,087.75 2087.75 GBP
DN250 (10" NB) SCHEDULE 10S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 406.4mm
Flange thickness (C): 30.2mm
Hub length (X): 316 Stainless Steel.8mm
Neck height (A): 273.0mm
Pitch circle diameter (K): 361.9mm
Hub base diameter (Y): 101.6mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 323.8mm
Number of bolt holes: 12
Material: 316 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 1,411.48 1411.48 GBP
DN250 (10" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 40S ASA150 WELD NECK FLANGE SS 304
Outside diameter (O): 406.4mm
Flange thickness (C): 30.2mm
Hub length (X): 304 Stainless Steel.8mm
Neck height (A): 273.0mm
Pitch circle diameter (K): 361.9mm
Hub base diameter (Y): 101.6mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 323.8mm
Number of bolt holes: 12
Material: 304 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 40S ASA150 WELD NECK FLANGE SS 316
Outside diameter (O): 406.4mm
Flange thickness (C): 30.2mm
Hub length (X): 316 Stainless Steel.8mm
Neck height (A): 273.0mm
Pitch circle diameter (K): 361.9mm
Hub base diameter (Y): 101.6mm
Raised face height (RF): 15.5mm
Raised face diameter (R): 323.8mm
Number of bolt holes: 12
Material: 316 Stainless Steel
Rating: ASA 150
Type: Weld Neck Flange (ASME B16.5)

Standards: ASME B16.5
Flange Face: Raised Face
Certification Available: 3.1 BS EN 10204 Material Certification

Alternative terminology:
WN Flange, Welding Neck, ASA150, Stainless Steel, RF
£ 1,582.91 1582.91 GBP
DN250 (10" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN250 (10" NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 444.5mm
Flange thickness (C): 47.7mm
Hub height (X): 320.5mm
Length through hub (A): 273.0mm
Bolt circle diameter (K): 336.6mm
Overall height (Y): 117.3mm
Raised face thickness (RF): 1.5mm
Bore (B): 323.8mm
Number of bolt holes: 16
Bolt hole diameter: 28.4mm
Approx. weight: 44.3kg
Contact us for pricing 0.0 GBP
DN300 (12 NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP
DN300 (12" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP
DN300 (12" NB) SCHEDULE 10S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP
DN300 (12" NB) SCHEDULE 40S ASA300 WELD NECK FLANGE SS 304
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP
DN300 (12" NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP
DN300 (12" NB) SCHEDULE 80S ASA300 WELD NECK FLANGE SS 316
Outside diameter (O): 520.7mm
Flange thickness (C): 50.8mm
Hub height (X): 374.6mm
Length through hub (A): 323.8mm
Bolt circle diameter (K): 406.4mm
Overall height (Y): 130.0mm
Raised face thickness (RF): 1.5mm
Bore (B): 381.0mm
Number of bolt holes: 16
Bolt hole diameter: 31.7mm
Approx. weight: 64.0kg
Contact us for pricing 0.0 GBP