Flanges

Flanges Manufacturer, exporter & supplier in Mumbai, India.

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Alliance Steel Industries is a trusted manufacturer, exporter, and supplier of high-quality industrial flanges designed for demanding applications across oil & gas, petrochemical, chemical, power generation, construction, engineering, and process industries.

We manufacture flanges using quality-approved raw materials and advanced manufacturing processes to ensure dimensional accuracy, high strength, corrosion resistance, reliable performance, and long service life.

Our flanges are available in various sizes, pressure classes, materials, and specifications to meet diverse industrial requirements. At Alliance Steel Industries, quality is at the core of our manufacturing process. From raw material selection to machining, inspection, finishing, and packaging, every stage is carefully controlled to deliver flanges that meet customer specifications and industry requirements.

Flanges Specification

Standards
ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-43, BS 10, IS 1538 & IS 6392 EN-1092, DIN, BS 4504, BS 10, etc.
Flange Size 1/8″NB To 48″NB.
Flange Class 150#, 300#, 400#, 600#, 900#, 1500#, 2500#, 3000#. Also as per the National & International Standard.
Standard of Flange SOLJ, WNFF, LAP Joint, SWFF, WNRF, WNRTJ, LWNRF, BLRF, BLFF, BLRTJ, SWRF, Spectacle, SORF, SOFF, Reducing, Threaded, Orifice & Studding Outlet
Types of Flanges

Lap Joint Flanges, (SOLJ), Weld neck Flanges (WNRF), Slip-on Flanges (SORF), Ring Type Joint Flanges (RTJ), Blind Flanges (BLRF), Socket-weld Flanges (SWRF), Screwed (Threaded) Flanges, Long weld neck Flanges (LWNRF), Spectacle Blind Flanges, Spacer & Blind Flanges, Reducing Flanges, Raised Face (RF) Flanges, Orifice Flanges, Ring Type Joint Flanges (RTJ), Deck Flange, Large Diameter Flanges, Forged Flanges, Plate Flanges, Flat Face Flanges, Custom Flanges, Drawing Flanges, etc.

DIN Flanges DIN 2573, DIN 2635, DIN 2641, DIN 2634, DIN 2566, DIN 2628, DIN 2629, DIN 2627, DIN 2527, DIN 2576, DIN 2673, DIN 2631, DIN 2632, DIN 2633, DIN 2642, DIN 2655, DIN 2636, DIN 2637, DIN 2638, DIN 2656,
BS Flanges BS 10, BS 1560, BS 4504, BS 4504,
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Key Features

  • High Strength
  • Superior Corrosion Resistance
  • Excellent Machinability
  • Good Weldability
  • High Temperature Performance
  • Uniform Surface Finish
  • Dimensional Accuracy:

Stainless Steel Flanges

Standards ASTM A182
Grade F201, F202, F301, F302, F304, F304L, F309, F310, F316, F316L, F316LN, F317L, F321, F347, 405, 409, 410, 420, 430, 440C, F904L

Carbon Steel Flanges

Standards ASTM A105, ASTM A350
Grades Gr. LF2, LF3, ASTM A694 -F42, F46, F48, F50, F52, F56, F60, F65, F70.

Alloy Steel Flanges

Standards ASTM A182 / ASME SA182
Grades F1, F5, F9, F11, F12, F22, F91

Copper Nickel Alloy Flanges

Standards ASTM / ASME SB 61 / 62 / 151 / 152
Grades Copper Nickel 90 / 10, Copper Nickel 90 / 10

Duplex & Super Duplex Steel Flanges

Standards ASTM A182
Grade 2205 (F51, S31803 / F60, S32205), SMO254 (F44, S32154), 2507 (F53, S32750 / F55, S32760), Ferralium 255 (F61, S32550).

Nickel Alloy Flanges

Standards ASTM B564 / B182
Grade 200 (N02200), 201 (N02201), Alloy 20 (N08020).

Monel Flanges

Standards ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Grade Monel 400, Monel K500

Inconel/Incoloy

Standards ASTM B564 / B408/ B425 / A182
Grade 600 (N06600), 601 (N06601), 625 (N06625), 718 (N07718), 800 (N08800), 800H (N08810), 800HT (N08811),825 (N08825), F904L (N08904).

Hastelloy Flanges

Standards ASTM B564 / B572
Grade C726 (N10276), C4 (N06455), C22 (N06022), C2000 (N06200), X (N06002), B2 (N10665), B3 (N10675).

SMO 254 Flanges

Standards ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.

Mild Steel Flanges

Standards IS 2062,ANSI B16.5,IS 2002,ANSI B16.5

Titanium Flanges

Standards ASTM B381
Grade F2, F5 (Ti6AI4V), F7.

Slip On Flanges

Socket Weld Flanges

Blind Flanges

Weld Neck Flanges

Threaded / Screwed Flanges

Lap Joint Flanges

Long Weld Neck Flanges

Spectacle Blind Flanges

Plate Flanges

Ring Type Joint Flanges

Tongue & Groove Flanges

Reducing Flanges

Nippo Flanges

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Orifice Flanges

Square Flanges

Spades Ring Spacers Flanges


Manufacturing Standard of Flanges

American Steel Flanges Standard
Standard Code Standard Name
ANSI ASME SA-182 Forged Flanges
ANSI ASME B16.5 Slip on flange, Welding neck flange, Blind flange, Threaded flange, Lap joint flange, RTJ flange
ASME – B 16.47 Welding neck flange, Blind flange
ASME – B 16.36 Welding neck flange Slip on flange
German Steel Flanges Standard
DIN 2527 Steel Blind Flanges, BLRF
DIN 2573 / 2576 Flat Flange for Welding (Slip On)
DIN 2673 Loose Flanges and Rings for Welding (Slip On Flanges and Plain Collars)
DIN 2641 / 2642 Lapped / Loose (Lap Joint) Flanges Plain Collars
DIN 28115 Long Neck Welding Flanges
DIN PN10, PN16 SS 304 PN10 Flanges, 304 SS DIN PN 10 Flanges, 304 SS PN16 Flange
DIN PN20, PN25 SS 304 PN20 Flanges, 304 SS DIN PN 25 Flanges
DIN PN40, PN50 SS 304 PN40 Flanges, 304 SS DIN PN 50 Flanges
Japanese Steel Flanges Standard
JIS B2220 Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL)
JIS B2291 Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL)
JIS 5K, 10K SS 304 5K SORF Flanges, 304 SS 10K SOFF Flanges
JIS 16K, 20K SS 304 16K Blind Flanges, 304 SS 20K BLRF Flanges
JIS 30K, 40K SS 304 30K Slip on Flanges, 304 SS 40K Blind Flanges
Italian Flanges Standard
UNI FLANGES Plan flanges (2276, 2277, 2278, 6083, 6084) Welding neck (2280, 2281, 2282, 2283, 2284, 2285, 2286) Lapped flanges (6088, 6089, 6090, 2999, 2300) Blind flanges (6091, 6092, 6093, 6094, 6095, 6096, 6097) threaded flanges (2253, 2254)
British Standard Pipe Flanges Standard
BS 10 Table D SS 304 BS 10 Table D Flanges, 304 Table D Pipe Flange
BS 10 Table E SS 304 BS 10 Table E Flanges, 304 Table E Pipe Flange
BS 10 Table F SS 304 BS 10 Table E Flanges, 304 Stainless Steel Table E Flanges
BS 10 Table H SS 304 BS 10 Table E Flanges, Stainless Steel 304 Table E Pipe Flanges

Schedule / Class Of Pipe Flanges

Flange Schedule/Class Pipe Size - Pipe Flanges Flange Connection Type Flange Material Max. Pressure
ASME B16.5 Class 150 1/2" FNPT Stainless Steel 304 / 304L Flanges 150 psi
ASME B16.5 Class 150 1/2" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 1/2" Welded Stainless Steel 304 / 304L Flanges 150 psi
ASME B16.5 Class 150 3/4" FNPT Stainless Steel 304 / 304L Flanges 150 psi
ASME B16.5 Class 150 3/4" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 1-1/4" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 1-1/2" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 2" FNPT Stainless Steel 304 / 304L Flanges 150 psi
ASME B16.5 Class 150 2" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 2-1/2" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 3" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 150 4" FNPT Stainless Steel 304 / 304L Flanges 150 psi
ASME B16.5 Class 150 4" Socket Weld Stainless Steel 304 / 304L Flanges 275 psi
ASME B16.5 Class 300 1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1-1/4" FNPT Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1-1/4" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1-1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 1-1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 2-1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 2-1/2" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 3" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 3" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 4" Slip On Stainless Steel 304 / 304L Flanges 720 psi
ASME B16.5 Class 300 4" Slip On Stainless Steel 304 / 304L Flanges 720 psi

Flanges Size Chart

Nominal Pipe Size Outside Diameter of Flanges Thickness of Flanges Diameter of Raised Face Diameter of Hub at Base Length Thru Hub Diameter or Bore Diameter of Hub at Bevel Radius of Fillet Depth of Socket
Welding Neck Slip-On Threaded Socket Lap Joint Slip-on Socket Lap Joint
O Q R X Y Y Y W B H r Z
1/2 3-1/2 7/16 1-3/8 1-3/16 1-7/8 5/8 5/8 .88 .90 .84 1/8 3/8
3/4 3-7/8 1/2 1-11/16 1-1/2 2-1/16 5/8 5/8 1.09 1.11 1.05 1/8 7/16
1 4-1/4 9/16 2 1-15/16 2-3/16 11/16 11/16 1.36 1.38 1.32 1/8 1/2
1-1/4 4-5/8 5/8 2-1/2 2-5/16 2-1/4 13/16 13/16 1.70 1.72 1.66 3/16 9/16
1-1/2 5 11/16 2-7/8 2-9/16 2-7/16 7/8 7/8 1.95 1.97 1.90 1/4 5/8
2 6 3/4 3-5/8 3-1/16 2-1/2 1 1 2.44 2.46 2.38 5/16 11/16
2-1/2 7 7/8 4-1/8 3-9/16 2-3/4 1-1/8 1-1/8 2.94 2.97 2.88 5/16 3/4
3 7-1/2 15/16 5 4-1/4 2-3/4 1-3/16 1-3/16 3.57 3.60 3.50 3/8 13/16
3-1/2 8-1/2 15/16 5-1/2 4-13/16 2-13/16 1-1/4 1-1/4 4.07 4.10 4.00 3/8 7/8
4 9 15/16 6-3/16 5-5/16 3 1-5/16 1-5/16 4.57 4.60 4.50 7/16 15/16
5 10 15/16 7.5/16 6-7/16 3-1/2 1-7/16 1-7/16 5.66 5.69 5.56 7/16 15/16
6 11 1 8-1/2 7-9/16 3-1/2 1-9/16 1-9/16 6.72 6.75 6.63 1/2 1-1/16
8 13-1/2 1-1/8 10-5/8 9-11/16 4 1-3/4 1-3/4 8.72 8.75 8.63 1/2 1-1/4
10 16 1-3/16 12-3/4 12 4 1-15/16 1-15/16 10.88 10.92 10.75 1/2 1-5/16
12 19 1-1/4 15 14-3/8 4-1/2 2-3/16 2-3/16 12.88 12.92 12.75 1/2 1-9/16
14 21 1-3/8 16-1/4 15-3/4 5 2-1/4 3-1/8 14.14 14.18 14.00 1/2 1-5/8
16 23-1/2 1-7/16 18-1/2 18 5 2-1/2 3-7/16 16.16 16.19 16.00 1/2 1-3/4
18 25 1-9/16 21 19-7/8 5-1/2 2-11/16 3-13/16 18.18 18.20 18.00 1/2 1-15/16
20 27-1/2 1-11/16 23 22 5-11/16 2-7/8 4-1/16 20.20 20.25 20.00 1/2 2-1/8
24 32 1-7/8 27-1/4 26-1/8 6 3-1/4 4-3/8 24.25 24.25 24.00 1/2 2-1/2

Pipe Flanges Dimensions In MM

Dia. of Flange (in.) No. of Bolts Dia. of Bolts (in.) Dia. of Bolt Holes (in.) Bolt Circle (in.)
1/4 3-3/8 4 1/2 0.62 2-1/4
1/2 3-1/2 4 1/2 0.62 2-3/8
3/4 3-7/8 4 1/2 0.62 2-3/4
1 4-1/4 4 1/2 0.62 3-1/8
1-1/4 4-5/8 4 1/2 0.62 3-1/2
1-1/2 5 4 1/2 0.62 3-7/8
2 6 4 5/8 0.75 4-3/4
2-1/2 7 4 5/8 0.75 5-1/2
3 7-1/2 4 5/8 0.75 6
3-1/2 8-1/2 8 5/8 0.75 7
4 9 8 5/8 0.75 7-1/2
5 10 8 3/4 0.88 8-1/2
6 11 8 3/4 0.88 9-1/2
8 13-1/2 8 3/4 0.88 11-3/4
10 16 12 7/8 1 14-1/4
12 19 12 7/8 1 17
14 21 12 1 1.12 18-3/4
16 23-1/2 16 1 1.12 21-1/4
18 25 16 1-1/8 1.25 22-3/4
20 27-1/2 20 1-1/8 1.25 25
24 32 20 1-1/4 1.38 29-1/2

Flanges Weight Chart

Pipe Normal Diam. O.D. Flange  Thk. Of Flange Min  Diam.
of
Hub 
Diameter of Raised Face  Length Hub.Y Thread Length Diam. 
of Bolt
Circle
Diam. 
of Bolt
Holes
Number
of Bolts
Diam. of
Bolts
(inch)
KG LB
inch dn O C X G Y T BC BH BN BD
1/2" 15 89.00 11.20 30.20 35.10 15.70 15.70 60.50 15.80 4 1/2" 0.4 0.9
3/4" 20 98.50 12.70 38.10 42.90 15.70 15.70 69.90 15.80 4 1/2" 0.7 1.5
1" 25 108.00 14.20 49.30 50.80 17.50 17.50 79.30 15.80 4 1/2" 0.8 1.8
1-1/4" 32 117.50 15.70 58.70 63.50 20.60 20.60 88.90 15.80 4 1/2" 1.2 2.6
1-1/2" 40 127.00 17.50 65.00 73.20 22.40 22.40 98.60 15.80 4 1/2" 1.5 3.3
2" 50 152.50 19.10 77.70 91.90 25.40 25.40 120.70 19.10 4 5/8" 2.3 5.1
2-1/2" 65 178.00 22.40 90.40 104.60 28.40 28.40 139.70 19.10 4 5/8" 3.7 8.1
3" 80 190.50 23.90 108.00 127.00 30.20 30.20 152.40 19.10 4 5/8" 4.1 9
3-1/2" 90 216.00 23.90 122.20 139.70 31.80 31.80 177.80 19.10 8 5/8" 5.1 11.2
4" 100 228.50 23.90 134.90 157.20 33.30 33.30 190.50 19.10 8 5/8" 5.9 13
5" 125 254.00 23.90 163.60 185.70 36.60 36.60 215.90 22.40 8 3/4" 7 15.4
6" 150 279.50 25.40 192.00 215.90 39.60 39.60 241.30 22.40 8 3/4" 8.4 18.5
8" 200 343.00 28.40 246.10 269.70 44.50 44.50 298.50 22.40 8 3/4" 13 28.6
10" 250 406.50 30.20 304.80 323.90 49.30 49.30 362.00 25.40 12 7/8" 18 39.5
12" 300 482.50 31.80 365.30 381.00 55.60 55.60 431.80 25.40 12 7/8" 29 64
14" 350 533.50 35.10 400.10 412.80 57.20 57.20 476.30 28.50 12 1" 39 86
16" 400 597.00 36.60 457.20 469.90 63.50 63.50 539.80 28.50 16 1" 47 103
18" 450 635.00 39.60 505.00 533.40 68.30 68.30 577.90 31.80 16 1 1/8" 57 126
20" 500 698.50 42.90 558.80 584.20 73.20 73.20 635.00 31.80 20 1 1/8" 76 167
24" 600 813.00 47.80 663.40 692.20 82.60 82.60 749.30 35.10 20 1 1/4" 97 214

We Export this Flanges to countries such as Afghanistan, Albania, Andorra, Austria, Bahrain, Bangladesh, Bhutan, Brunei, Belarus, Belgium, Bulgaria, Cambodia, China, Cyprus, Croatia, Czech Republic, Denmark, Estonia, Egypt, Finland, France, Germany, Greece, Georgia, Hungary, Iceland, Ireland, Italy, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Lebanon, Latvia, Latin America, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Malaysia, Maldives, Mongolia, Myanmar (Burma), Nepal, North Korea, Netherlands, Norway, Oman, Poland, Portugal, Pakistan, Palestine, Philippines, Qatar, Russia, Romania, Russia, San Marino, Serbia and Montenegro, Slovakia, Slovenia, Spain, Sweden, Switzerland, Saudi Arabia, Singapore, South Korea, South Africa, Sri Lanka, Syria, Taiwan, Tanzania, Tajikistan, Thailand, Turkey, Turkmenistan, Ukraine, United Kingdom, United Arab Emirates (UAE), Uzbekistan, Vietnam, Yemen.

We Supply Flanges to cities including Mumbai, Delhi, Kolkata, Chennai, Bengaluru, Hyderabad, Ahmadabad, Pune, Surat, Jaipur, Kanpur, Lucknow, Nagpur, Ghaziabad, Indore, Coimbatore, Kochi, Patna, Kozhikode, Bhopal, Thrissur, Vadodara, Agra, Malappuram, Thiruvananthapuram, Kannur, Ludhiana, Nashik, Vijayawada, Madurai, Varanasi, Meerut, Faridabad, Rajkot, Jamshedpur, Srinagar, Jabalpur, Asansol, Vasai Virar City, Allahabad, Dhanbad, Aurangabad, Amritsar, Jodhpur, Ranchi, Raipur, Kollam, Gwalior, Durg-Bhilainagar, Chandigarh, Tiruchirappalli, Kota.

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