Flanges

FLANGES

WELD NECK FLANGES SERIES A OR B

Weld Neck Flanges are drilled(machined) with the wall thickness of the flange having the same dimensions of the matching pipe, the lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the small the bore, they are normally used for highpressure, cold or hot temperature. 

Stainless Steel:

ASTM / ASME SA 182 F 304, 304L, 304H, 309H, 310H, 316, 316H, 316L, 316 LN, 317, 317L, 321, 321H, 347, 347 H. 

Duplex Steel:

ASTM / ASME SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61. 

Nickel Alloy

ASTM / ASME SB 564 UNS 2200 (NICKEL 200), UNS 4400 (MONEL 400), UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276)
ASTM / ASME SB 160 UNS 2201 (NICKEL 201 )
ASTM / ASME SB 472 UNS 8020 (ALLOY 20 / 20 CB 3)

Copper Alloy

ASTM / ASME SB 61 UNS NO. C 92200 & ASTM / ASME SB 62 UNS NO. C 83600.
ASTM / ASME SB 151 UNS NO. 70600, 71500, C 70600 ( CU -NI- 90/10), C 71500 ( CU -NI- 70/30)
ASTM / ASME SB 152 UNS NO C 10100, C 10200, C 10300, C 10800, C 12000, C 12200.

Carbon Steel

ASTM / ASME A 105
ASTM / ASME A 350 LF 2

Alloy Steel

ASTM / ASME A 182 GR F 5, F 9, F 11, F 12, F 22, F 91

Dimensions

Welding neck flange bores according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - can be found in the table below:

Welding Neck Flange Bores
Nominal Pipe Size
(inches)
Outside Diameter
(inches)
Inside Diameter (inches)
Light Wall 1)Schedule 20Schedule 30Standard WallSchedule 40Schedule 60
1/20.8400.674--0.6220.622-
3/41.0500.884--0.8240.824-
11.3151.097--1.0491.049-
1 1/41.6601.442--1.3801.380-
1 1/21.9001.682--1.6101.610-
22.3752.157--2.0672.067-
2 1/22.8752.635--2.4692.469-
33.5003.260--3.0683.068-
3 1/24.0003.760--3.5483.548-
44.5004.260--4.0264.026-
55.5635.295--5.0475.047-
66.6256.357--6.0656.065-
88.6258.3298.1258.0717.9817.9817.813
1010.75010.42010.25010.13610.02010.0209.750
1212.75012.39012.25012.09012.00011.93811.626
1414.00013.50013.37613.25013.25013.12412.812
1616.00015.50015.37615.25015.25015.00014.688
1818.00017.50017.37617.12417.25016.87616.500
2020.00019.50019.25019.00019.25018.81218.376
2424.00023.50023.25022.87623.25022.62422.062
3030.00029.37629.00028.75029.250--
3636.00035.37635.00034.75035.25034.500-
4242.000---41.250--
4848.000---47.250--

Welding Neck Flange Bores
Nominal Pipe Size
(inches)
Outside Diameter
(inches)
Inside Diameter (inches)
Extra StrongSchedule 80Schedule 100Schedule 120Schedule 140Schedule 160Double Extra Strong
1/20.8400.5460.546---0.4640.252
3/41.0500.7420.742---0.6120.434
11.3150.9570.957---0.8150.599
1 1/41.6601.2781.278---1.1600.896
1 1/21.9001.5001.500---1.3381.100
22.3751.9391.939---1.6871.503
2 1/22.8752.3232.323---2.1251.771
33.5002.9002.900---2.6242.300
3 1/24.0003.3643.364----2.728
44.5003.8263.826-3.624-3.4383.152
55.5634.8134.813-4.563-4.3134.063
66.6255.7615.761-5.501-5.1874.897
88.6257.6257.6257.4377.1877.0016.8136.875
1010.7509.7509.5629.3129.0628.7508.5008.750
1212.75011.75011.37411.06210.75010.50010.12610.750
1414.00013.00012.50012.12411.81411.50011.188-
1616.00015.00014.31213.93813.56413.12412.812-
1818.00017.00016.12415.68815.25014.87614.438-
2020.00019.00017.93817.43817.00016.50016.062-
2424.00023.00021.56220.93820.37619.87619.312-
3030.00029.000------
3636.00035.000------
4242.00041.000------
4848.00047.000------