Long Weld Neck Flanges

Hex Nuts

Hariom Steels is a distinguished supplier of Long Weld Neck Pipe Flanges, which are commonly hardened yet remain machinable. Duplex Steel Long Weld Neck Flanges offer modest corrosion protection across various environments, positioned between standard austenitic alloys and highly alloyed molybdenum types. However, they are not entirely impervious to environmental conditions such as aerated saltwater. Due to the tendency of this steel, combined with austenitic weld metal and excessive heat input, to develop heat cracks, it is essential to grind tacks or ensure they are free of crater cracks. These flanges have a wide range of applications, including in dentistry and surgical tools, pipes, valves and nozzles, automobile components, and more.

Long Weld Neck Flanges Specifications

Size Chart1/2" (15 NB) to 48" (1200NB) DN10~DN5000
StandardsANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ASME Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ASME B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
Pressure Rating ANSIClass 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
DIN6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
JIS5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
UNI6Bar 10Bar 16Bar 25Bar 40Bar
EN6Bar 10Bar 16Bar 25Bar 40Bar
CoatingOil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized
Most Common TypesForged / Threaded / Screwed / Plate
Test CertificatesEN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production technique
  • Forged, Heat treated and machined
Connect Type/ Flange Face TypeRaised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove
Special design

As per your drawing
AS, ANSI, BS, DIN and JIS
15 NB (1/2") to 200 NB (8")
Equal and Reducing Configurations

TestDirect-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
EquipmentPress machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc
OriginIndian / West Europe / Japan / USA / Korean
Manufacturer of

ASME DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc.
ANSI B16.5 Class 150 Long Weld Neck Flanges: -BS Flange, EN Flange, API 6A Flanges, ASME Flanges, ASME Flanges, DIN Flanges, EN1092-1 Flanges, UNI Flanges, JIS/ KS Flanges, BS4504 Flanges, GB Flanges, AWWA C207 Flanges, GOST Flanges, PSI Flangse

  • B.S: BS4504 , BS3293, BS1560, BS10
  • AS 2129: Table D; Table E; Table H
  • ASME B16.5, ASME B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
  • ASME : ASME B16.5, ASME B16.47(API605), MSS SP44, ASME B16.5, ASME B16.48
  • ASME B16.5, ASME B16.47, MSS SP44, ASME B16.5, ASME B16.48
  • American standard (ANSI)
  • German (DIN)
  • British standard (BS)
  • DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 ANSI B16.5 Class 150 Long Weld Neck Flanges
  • The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276
Uses & Application
  • Bitumen upgraders.
  • Heavy oil refineries.
  • Nuclear power (mostly seamless).
  • Petrochemicals and acids.

Material Grades of Long Weld Neck Flanges

Stainless Steel Long Weld Neck FlangesASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Carbon Steel Long Weld Neck FlangesASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Alloy Steel Long Weld Neck FlangesASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Titanium Long Weld Neck FlangesASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7
ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Copper Long Weld Neck FlangesT1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel Long Weld Neck FlangesASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Inconel Long Weld Neck FlangesASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750 ANSI B16.5 Class 150 Long Weld Neck Flanges
Hastelloy Long Weld Neck FlangesASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X Flanges
Monel Long Weld Neck FlangesASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20 Long Weld Neck FlangesASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium Long Weld Neck Flanges5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel Alloy Long Weld Neck FlangesASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Duplex Steel Long Weld Neck FlangesS31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Long Weld Neck FlangesS32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy Long Weld Neck FlangesASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925 Flanges
254 SMO Long Weld Neck FlangesASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic Long Weld Neck FlangesNimonic 75, Nimonic 80A, Nimonic 90
Brass Long Weld Neck Flanges3602 / 2604 / H59 / H62 / etc.
Other Long Weld Neck Flanges materialTin bronze, Alumunum bronze, Lead bronze

Long Weld Neck Flanges Dimensions Chart:


ANSI/ASME/ASA B16.5 150lb/sq.in. Flanges
øDbgmJhkHoleslKg.
1/2"88,911,134,930,222,315,960,3415,90,400
3/4"98,412,742,938,127,715,969,8415,90,700
1"107,914,350,849,234,517,579,4415,90,800
1 1/4"117,515,963,558,843,220,688,9415,91,100
1 1/2"127,017,573,065,149,522,298,4415,91,400
2"152,419,092,177,862,025,4120,6419,02,200
2 1/2"177,822,2104,890,574,728,6139,7419,03,600
3"190,523,8127,0107,990,730,2152,4419,04,100
3 1/2"215,923,8139,7122,2103,431,7177,8819,05,200
4"228,623,8157,2134,9116,133,3190,5819,05,600
5"254,023,8185,7163,6143,836,5215,9822,26,300
6"279,425,4215,9192,1170,739,7241,3822,27,500
8"342,928,6269,9246,1221,544,4298,4822,212,600
10"406,430,2323,8304,8276,349,2361,91225,418,500
12"482,631,7381,0365,1327,155,6431,81225,528,000
14"533,434,9412,7400,0359,157,1476,21228,636,000
16"596,936,5469,9457,2410,563,5539,71628,646,000
18"635,039,7533,4504,8461,868,3577,81631,750,000
20"698,542,9584,2558,8513,173,0635,02031,764,000
22"749,346,0641,2609,6564,479,4692,12034,972,000
24"812,847,6692,1663,6615,982,5749,32034,989,000
ANSI/ASME/ASA B16.5 600lb/sq.in. Flanges
øDbgmJhkHoleslKg.
1/2"95,214,334,938,122,322,266,7415,90,800
3/4"117,515,942,947,627,725,482,5419,01,400
1"123,817,550,854,034,527,088,9419,01,600
1 1/4"133,320,663,563,543,228,698,4419,02,100
1 1/2"155,622,273,069,849,531,7114,3422,23,100
2"165,125,492,184,162,036,5127,0819,03,700
2 1/2"190,528,6104,8100,074,741,3149,2822,25,400
3"209,531,7127,0117,590,746,0168,3822,27,300
3 1/2"228,634,9139,7133,3103,449,2184,1825,48,900
4"273,038,1157,2152,4116,154,0215,9825,411,800
5"330,244,4185,7188,9143,860,3266,7828,624,500
6"355,647,6215,9222,2170,766,7292,11228,629,500
8"419,155,6269,9273,0221,576,2349,21231,743,000
10"508,063,5323,8342,8276,385,7431,81634,970,000
12"558,866,7381,0400,0327,192,1488,92034,986,000
14"603,269,8412,7431,8359,193,7527,02038,1100,000
16"685,876,2469,9495,3410,5106,4603,22041,3142,000
18"742,982,5533,4546,1461,8117,5654,02044,4175,000
20"812,888,9584,2609,6513,1127,0723,92444,4232,000
22"869,995,2641,2666,7564,4133,3777,92447,6292,000
24"939,8101,6692,1717,5615,9139,7838,22450,8330,000

Long Weld Neck Flanges Applications:

  • High-pressure and high-temperature piping systems
  • Applications requiring robust joint integrity and alignment
  • Used in sectors such as chemical processing and petrochemical industries
  • Suitable for applications with moderate corrosion protection needs
  • Common in valves, nozzles, and heavy-duty pipe systems
  • Ideal for use in industries like automotive, aerospace, and industrial machinery