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  6. ANSI B16.5

ANSI B16.5

Stainless Steel Weld Neck Flanges – ANSI B16.5, 150lb to 1500lb

Integraflow supplies ANSI/ASME B16.5 stainless steel weld neck flanges in 304 (1.4301) and 316L (1.4404) grades, covering 150lb, 300lb, 600lb, 900lb, and 1500lb pressure ratings with bores to suit Schedule 10S, 40S, 80S, and 160Spipe, sourced from European and Far Eastern mills, and supplied with full BS EN 10204 3.1 material certification for high-pressure, welded pipeline applications in industrial and process systems.


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ANSI B16.5

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