ASTM A266 Flanges

ASTM A266 Flanges

Contact us if you are looking for SA266 Gr. 2 Weld Neck Flange Manufacturer in India, Check Dimension and Price list of A266 Gr. 4 Slip on Flanges

ASTM A266 grade covers carbon steel modules for pressure vessel grades. They are assigned into 4 classes, each having its own strength and performance. The ASTM A266 Flanges are designed with a chemical composition of carbon, manganese, phosphorous, sulfur, and silicon. These flanges possess superior strength and don’t easily disorientate or get damaged in any environment. The A266 Gr. 2 SORF Flange is directly slid on the pipe and welded in place using one or more fillet welds. These flanges have a raised face and are generally preferred in low-pressure and temperature applications. The ASTM A266 Gr. 2 Weld Neck Flange has a long protruding hub or a face allowing it to be used in high pressure and temperature applications. These versatile flanges are generally welded in place using a butt-weld. An A266 Gr. 4 Blind Flange is used to curtail the flow of fluids and gases in the system. These flanges possess a blank face type that is bolted in place, allowing room for maintenance and cleaning.

Reliable & Fast ASTM A266M Grade 4 Blind Flange and Carbon Steel SA 266 Gr 2 Lap Joint Flange Supplier in India

The Alloy Steel SA 266 Gr 4 Orifice Flanges is a versatile flange type that is used in measuring the flow rate of fluids and gases in a pipeline. These flanges are available with a raised face or a ring-type flange. An ASTM A266 Gr. 4 Socket Weld Flange is used in higher pressure systems of smaller sized pipes. These flanges are attached to a socket end by applying a fillet weld on top of the module. A Carbon Steel SA 266m Gr 2 Lap Joint Flange is made with a stub end and a ring-type sealing that allows the pipe to move freely in the system. These flanges possess a long service life as they don’t come in constant contact with the liquids and gases in the system.

Check ASTM A266M Grade 3 Threaded Flange and A266 Gr. 2 SORF Flange Weight Chart, Dimension and Price list

ASTM A266 Flanges

ASTM A266 Flanges


SA266 Gr. 2 Weld Neck Flange

SA266 Gr. 2 Weld Neck Flange


A266 Gr. 4 Slip on Flanges

A266 Gr. 4 Slip on Flanges



ASTM A266 Standard Specification

Specifications ASTM A266 Flanges
Productivity 800 ton/ Month
Face Type RF/ RTJ/ FF
Supporting Material Ring Joint/ Gasket/ Flange Bolts
Manufacturer Length NPS 1⁄₂" upto NPS 48”
Flange Equipment Press/ Pushing/ Bending/ Electric bevelling and Sand-blasting machine etc
Schedule Chart Schedule 5S upto XXS
Production Technique Heat treated/Forged and Machined
Flange Test Direct reading Spectrograph/ UI trasonic flaw detector/ Hydrostatic testing machine/ X rays detector/ Magnetic particle detector
Manufacturer of Screwed / Threaded/ Forged/ Plate
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Coating Zinc Plated/ Anti-rust Paint/ Yellow Transparent/ Oil Black Paint/ Hot and Cold Dip Galvanized
Packing Plywood Box and Plywood Pallet
Application Bitumen upgraders
Heavy oil refineries.
Nuclear power (mostly seamless).
Petrochemicals and acids.
Forging Methods Rolling & Cutting, Forging & Casting
Supply Ability 700 Ton/ Month
Transportation Air and Ocean
JIS Standard 10K/ 63K/ 5K/ 16K/ 30K/ 20K/ 40K

SA266 Material Price

Size (Inch) Flanges Type Schedule Grades Class Price (INR) Per Piece
3/4 Blind Flanges 40 ASTM A266 Carbon Steel 150 540.00
1 - 40 - 150 173.00
1-1/2 - 40 - 150 784.00
2 - 40 - 150 477.00
4 Blind 40 - 150 644.00
2 Weld Neck Flanges STD - 150 510.00
4 - STD - 300 750.00
6 - 80 - 300 1487.00
8 - 80 - 300 1542.00
10 Weld Neck 80 - 300 2783.00
2 Slip On Flanges 40 - 150 277.00
3 - 40 - 150 457.00
4 - 80 - 300 843.00
6 - 80 - 300 2050.00
8 Slip On 80 ASTM A266 Carbon Steel 300 2487.00

ASTM A266 Flanges Types

SA 266 Gr 2 SORF Flanges

SA 266 Gr 2 SORF Flanges

ASME Sa266 Cl2 Grade 2 Flanges

ASME Sa266 Cl2 Grade 2 Flanges

ASTM A266M Grade 4 Blind Flanges

ASTM A266M Grade 4 Blind Flanges

Carbon Steel SA 266 Gr 4 Orifice Flanges

Carbon Steel SA 266 Gr 4 Orifice Flanges

ASTM A266 Gr. 2 Weld Neck Flanges

ASTM A266 Gr. 2 Weld Neck Flanges

ASTM A266 Gr. 4 Socket Weld Flanges

ASTM A266 Gr. 4 Socket Weld Flanges

SA 266 Gr 4 Forged Flanges

SA 266 Gr 4 Forged Flanges

Carbon Steel SA 266m Gr 2 Lap Joint Flanges

Carbon Steel SA 266m Gr 2 Lap Joint Flanges

ASTM A266M Grade 3 Threaded Flanges

ASTM A266M Grade 3 Threaded Flanges


ASTM A266M Grade 4 Blind Flange Thickness Chart

Pipe Normal Size Outer Diam. 160 SCH 20 SCH XX Hvy 80 SCH 10 SCH 140 SCH 30 SCH STD Wall 60 SCH 40 SCH EXT Hvy 100 SCH 120 SCH
½ 0.84 0.188 ... 0.294 0.147 0.083 ... ... 0.109 ... 0.109 0.147 ... ...
¾ 1.05 0.219 ... 0.308 0.154 0.083 ... ... 0.113 ... 0.113 0.154 ... ...
1 1.315 0.25 ... 0.358 0.179 0.109 ... ... 0.133 ... 0.133 0.179 ... ...
1 ¼ 1.66 0.25 ... 0.382 0.191 0.109 ... ... 0.14 ... 0.14 0.191 ... ...
1 ½ 1.9 0.281 ... 0.4 0.2 0.109 ... ... 0.145 ... 0.145 0.2 ... ...
2 2.375 0.344 ... 0.436 0.218 0.109 ... ... 0.154 ... 0.154 0.218 ... ...
2 ½ 2.875 0.375 ... 0.552 0.276 0.12 ... ... 0.203 ... 0.203 0.276 ... ...
3 3.5 0.438 - 0.6 0.3 0.12 - - 0.216 - 0.216 0.3 - -
3 ½ 4 - - 0.636 0.318 0.12 - - 0.226 - 0.226 0.318 - -
4 4.5 0.531 - 0.674 0.337 0.12 - - 0.237 - 0.237 0.337 - 0.438
5 5.563 0.625 - 0.75 0.375 0.134 - - 0.258 - 0.258 0.375 - 0.5
6 6.625 0.719 - 0.864 0.432 0.134 - - 0.28 - 0.28 0.432 - 0.562
8 8.625 0.906 0.25 0.875 0.5 0.148 0.812 0.277 0.322 0.406 0.322 0.5 0.594 0.719
10 10.75 1.125 0.25 1 0.594 0.165 1 0.307 0.365 0.5 0.365 0.5 0.719 0.844
12 12.75 1.312 0.25 1 0.688 0.18 1.125 0.33 0.375 0.562 0.406 0.5 0.844 1
14 14 1.406 0.312 - 0.75 0.25 1.25 0.375 0.375 0.594 0.438 0.5 0.938 1.094
16 16 1.594 0.312 - 0.844 0.25 1.438 0.375 0.375 0.656 0.5 0.5 1.031 1.219
18 18 1.781 0.312 - 0.938 0.25 1.562 0.438 0.375 0.75 0.562 0.5 1.156 1.375
20 20 1.969 0.375 - 1.031 0.25 1.75 0.5 0.375 0.812 0.594 0.5 1.281 1.5
22 22 - - - - 0.25 - - 0.375 - - 0.5 - -
24 24 2.344 0.375 - 1.219 0.25 2.062 0.562 0.375 0.969 0.688 0.5 1.531 1.812
26 26 - - - - - - - 0.375 - - 0.5 - -
30 30 - 0.5 - - 0.312 - 0.625 0.375 - - 0.5 - -

Tolerance Of ASTM A266 Gr. 4 Socket Weld Flange

Dimension ASTM A266 Flanges Tolerance
(J) hub at base Diam.
  • When hub base is 24 inch or smaller: ±1/16" (1.6millimeter)
  • When hub base is over 24": ±1/8" (3.2millimeter)
(D) Inner Diam.
  • 10 Inch and smaller: ±1/32" (0.8millimeter)
  • 12 Inch thru 18": +1/8" (3.2millimeter)
  • 20 Inch and larger: -1/16" (1.6millimeter)
(P) Drilling
  • B.C.: ±1/16" (1.6millimeter)
  • Bolt hole spacing: ±1/32" (0.8millimeter)
(B) contact face Diam.
  • 1/16" raised face: ±1/32" (0.8millimeter)
  • 1/4" RF, Tongue And Groove (male And female): ±1/64" (0.4millimeter)
(H) Dia. of hub at point of welding
  • 5 inch and smaller: +3/32" (2.4 mm), -1/32" (0.8 mm)
  • 6 inch and larger: +5/32" (4.0 mm), -1/32 (0.8 mm)
Eccentricity of bolt circle with respect to facing
  • 2 1/2" and smaller ±1/32" (0.8millimeter) maximum
  • 3" and larger ±1/16" (1.6millimeter) maximum
(C) Wall Thickness
  • 18 Inch and smaller: ±1/8" (3.2millimeter), -0"
  • 20 Inch and larger: ±3/16" (4.8millimeter), -0"
(A) Outer Diam.
  • When Outer Daim. is 24" or less: ±1/16" (1.6millimeter)
  • When Outer Daim. is over 24": ±1/8" (3.2millimeter)
(K) Hub Length
  • 10 Inch and smaller: ±1/16" (1.6millimeter)
  • 12 Inch and larger: ±1/8" (3.2millimeter)

ASTM A266 Grade 1 Electrical Properties

Electrical Conductivity: Equal Weight (Specific) 8.1 % IACS
Electrical Conductivity: Equal Volume 7.1 % IACS

ASTM A266m Grade 3 Threaded Flange Temperature Ratings

ANSI/ASME B16.34 ASME/ANSI Pressure Rating
Temp in C° Class 400# Class 150# Class 300# Class 900# Class 600# Class 2500# Class 1500#
-29 / 38 68.1 19.6 51.1 153.2 102.1 425.5 255.3
50 66.8 19.2 50.1 150.4 100.2 417.7 250.6
100 62.1 17.7 46.6 139.8 93.2 388.3 233
150 60.1 15.8 45.1 135.2 90.2 375.6 225.4
200 58.4 13.8 43.8 131.4 87.6 365 219
250 55.9 12.1 41.9 125.8 83.9 349.5 209.7
300 53.1 10.2 39.8 119.5 79.6 331.8 199.1
325 51.6 9.3 38.7 116.1 77.4 322.6 193.6
350 50.1 8.4 37.6 112.7 75.1 313 187.8
375 48.5 7.4 36.4 109.1 72.7 303.1 181.8
400 46.3 6.5 34.7 104.2 69.4 289.3 173.6
425 38.4 5.5 28.8 86.3 57.5 239.7 143.8
450 30.7 4.6 23 69 46 191.7 115
475 23.2 3.7 17.4 52.3 34.9 145.3 87.2
500 15.7 2.8 11.8 35.3 23.5 97.9 58.8

ASME SA 266 Gr 2 SORF Flange Application

  • Power Generation
  • Specialty Chemicals
  • Chemical Equipment
  • Condensers
  • Pulp and Paper Industry
  • Sea Water Equipment
  • Gas Processing
  • Off-Shore Oil Drilling Companies
  • Petrochemicals
  • Pharmaceutical Equipment
  • Heat Exchangers
  • Pharmaceuticals

Bolt Size Of SA 266 Gr 2 SORF Flange

Bolt Size Of SA 266 Gr 2 SORF Flange

Size (Inche) Size (mm) Bolts Number UNC Bolt Size RF Stud Length ISO Stud Size Machine Bolts Length
Class 150 Flanges
1/2 15 4 1/2 55 M14 50
3/4 20 4 1/2 65 M14 50
1 25 4 1/2 65 M14 55
1 1/4 32 4 1/2 70 M14 55
1 1/2 40 4 1/2 70 M14 65
2 50 4 5/8 85 M16 70
2 1/2 65 4 5/8 90 M16 75
3 80 4 5/8 90 M16 75
3 1/2 90 8 5/8 90 M16 75
4 100 8 5/8 90 M16 75
5 125 8 3/4 95 M20 85
6 150 8 3/4 100 M20 85
8 200 8 3/4 110 M20 90
10 250 12 7/8 115 M24 100
12 300 12 7/8 120 M24 100
14 350 12 1 135 M27 115
16 400 16 1 135 M27 115
18 450 16 1 1/8 145 M30 125
20 500 20 1 1/8 160 M30 140
24 600 20 1 1/4 170 M33 150

Size (Inche) Size (mm) Bolts Number UNC Bolt Size RF Stud Length ISO Stud Size Machine Bolts Length
Class 300 Flanges
1/2 15 4 1/2 65 M14 55
3/4 20 4 5/8 75 M16 65
1 25 4 5/8 75 M16 65
1 1/4 32 4 5/8 85 M16 70
1 1/2 40 4 3/4 90 M20 75
2 50 8 5/8 90 M16 75
2 1/2 65 8 3/4 100 M20 85
3 80 8 3/4 110 M20 90
3 1/2 90 8 3/4 110 M20 95
4 100 8 3/4 115 M20 95
5 125 8 3/4 120 M20 110
6 150 12 3/4 120 M20 110
8 200 12 7/8 140 M24 120
10 250 16 1 160 M27 140
12 300 16 1 1/8 170 M30 145
14 350 20 1 1/8 180 M30 160
16 400 20 1 1/4 190 M33 165
18 450 24 1 1/4 195 M33 170
20 500 24 1 1/4 205 M33 185
24 600 24 1 1/2 230 M39 205

ASTM A266 Carbon Steel Forgings and ASME SA266 Gr. 4 Socket Weld Flange Stockist and Distributor in India

ASTM A266 Grade 2 Flanges Chemical Composition Requirements

Item Chemical Composition for ASTM A266 Flanges, %
Gr. 3 Gr. 1 & 2 Gr. 4
S ≤ 0.025 ≤ 0.025 ≤ 0.025
P ≤ 0.025 ≤ 0.025 ≤ 0.025
C ≤ 0.35 ≤ 0.30 ≤ 0.30
Si 0.15~0.35 0.15~0.35 0.15~0.35
Mn 0.80~1.35 0.40~1.05 0.80~1.35

Gasket For ASTM A266 Carbon Steel Forgings Flange

Gasket For ASTM A266 Carbon Steel Forgings Flange

Steel Pipes Normal Size (Inch) Inner Daim. Gasket
Outer Daim. Gasket
Class 300#/ LB Class 150#/ LB Class 600#/ LB Class 400#/ LB Class 900#/ LB
1/2 0.84 2.125 1.875 2.125 2.125 2.50
3/4 1.06 2.625 2.25 2.625 2.625 2.75
1 1.31 2.875 2.625 2.875 2.875 3.125
1 1/4 1.66 3.25 3 3.25 3.25 3.50
1 1/2 1.91 3.75 3.375 3.75 3.75 3.875
2 2.38 4.375 4.125 4.375 4.375 5.625
2 1/2 2.88 5.125 4.875 5.125 5.125 6.50
3 3.50 5.875 5.375 5.875 5.875 6.625
4 4.50 7.125 6.875 7.625 7.00 8.125
5 5.56 8.50 7.75 9.50 8.375 9.75
6 6.62 9.875 8.75 10.50 9.75 11.375
8 8.62 12.125 11 12.625 12.00 14.125
10 10.75 14.25 13.375 15.75 14.125 17.125
12 12.75 16.625 16.125 18.00 16.50 19.625

ASME SA266 Flanges Hardness

ASTM A266 Brinell Hardness
HBW
Gr 4 137~197
Gr 2 137~197
Gr 1 121~170
Gr 3 156~207

SA266 Gr 4 Carbon Steel Flanges Weight

Pressure Classes Pipe Nominal Size Slip On (SORF) Threaded (NPT) Socket Weld (SWRF) Lap Joint (LOOSE) Blind (BLRF) Weld Neck (WNRF)
Class 300 Flanges ½ 2 2 3 2 2 2
¾ 3 3 3 3 3 3
1 3 3 3 3 4 4
4.5 4.5 4 4.5 6 5
6.5 6.5 6 6.5 7 7
2 7 7 7 7 8 9
10 10 10 10 12 12
3 13 14 13 14.5 16 18
17 17 17 17 21 20
4 23.5 24 22 24 28 26.5
5 29 31 28 28 37 36
6 39 39 39 39 50 45
8 58 58 58 58 81 69
10 81 81 81 91 124 100
12 115 115 115 140 185 142
14 165 165 165 190 250 206
16 210 220 190 234 315 250
18 253 280 250 305 414 320
20 315 325 315 375 515 400
22 370 370 370 435 640 465
24 490 490 475 550 800 580
Pressure Classes Pipe Nominal Size Slip On (SORF) Threaded (NPT) Socket Weld (SWRF) Lap Joint (LOOSE) Blind (BLRF) Weld Neck (WNRF)
Class 150 Flanges ½ 1 1 2 1 2 2
¾ 2 2 2 2 2 2
1 2 2 2 2 2 3
3 3 3 3 3 3
3 3 3 3 4 4
2 5 5 5 5 5 6
8 8 8 8 7 10
3 9 9 9 9 9 11.5
11 12 11 11 13 12
4 13 13 13 13 17 16.5
5 15 15 15 15 20 21
6 19 19 19 19 27 26
8 30 30 30 30 47 42
10 43 43 43 43 70 54
12 64 64 64 64 123 88
14 90 90 90 105 140 114
16 106 98 98 140 180 140
18 130 130 130 160 220 165
20 165 165 165 195 285 197
22 185 185 185 245 355 225
24 220 220 220 275 430 268

Carbon Steel SA 266M Gr 2 Lap Joint Flange Sizes

Pipe Normal Size DN
3/4 20
1/2 15
1 25
1 1/2 40
1 1/4 32

2

50

3

80

2 1/2

65

4

100


A266 Gr. 2 Shear Strength

Shear Strength
52 x 103 psi 360 MPa

ASTM A266 Grade 4 Flanges Mechanical Properties

Tensile
Requirements
Gr. 2 & 4 Gr. 1 Gr. 3
Y.S min
ksi [Mpa]
36
[250]
30
[205]
37.5
[260]
R.o.A
min %
33 38 30
EL. in 2" or
[62.5 mm]
min %
20
[18]
23
[21]
19
[17]
T.S min
ksi [Mpa]
70~95
[485~655]
60~85
[415~585]
75~100
[515~690]

Manufacturer of pressure tight Carbon Steel SA 266m Gr 2 Lap Joint Flange and A266 Gr 4 Forged Flange for moderate speeds and loads

ASTM A266 Carbon Steel Forgings Face Types

ASTM A266 Carbon Steel Forgings Face Types

SA 266 Gr 4 Forged Flange Dimensions

SA 266 Gr 4 Forged Flange Dimensions

Steel Pipe Normal Size Wall Tthicness Outer Daim. Raised Face Dai. (RF) thru Hub Length Fillet Radius Flanges Diameter & Bore Daim. of Hub at Base Flanges Diam. of (Hub at Bevel) Deptd Of Socket
SORF/ SWRF and NPT (WNRF) Lap Joint Loose For (Lap Joint) SORF/ SWRF and NPT
(Q) (O) (R) (Y) (Y) (Y) (r) (B) (W) (X) (H) (Z)
1/2 7/16 3-1/2 1-3/8 5/8 1-7/8 5/8 1/8 .90 .88 1-3/16 .84 3/8
3/4 1/2 3-7/8 1-11/16 5/8 2-1/16 5/8 1/8 1.11 1.09 1-1/2 1.05 7/16
1 9/16 4-1/4 2 11/16 2-3/16 11/16 1/8 1.38 1.36 1-15/16 1.32 1/2
1-1/4 5/8 4-5/8 2-1/2 13/16 2-1/4 13/16 3/16 1.72 1.70 2-5/16 1.66 9/16
1-1/2 11/16 5 2-7/8 7/8 2-7/16 7/8 1/4 1.97 1.95 2-9/16 1.90 5/8
2 3/4 6 3-5/8 1 2-1/2 1 5/16 2.46 2.44 3-1/16 2.38 11/16
2-1/2 7/8 7 4-1/8 1-1/8 2-3/4 1-1/8 5/16 2.97 2.94 3-9/16 2.88 3/4
3 15/16 7-1/2 5 1-3/16 2-3/4 1-3/16 3/8 3.60 3.57 4-1/4 3.50 13/16
3-1/2 15/16 8-1/2 5-1/2 1-1/4 2-13/16 1-1/4 3/8 4.10 4.07 4-13/16 4.00 7/8
4 15/16 9 6-3/16 1-5/16 3 1-5/16 7/16 4.60 4.57 5-5/16 4.50 15/16
5 15/16 10 7.5/16 1-7/16 3-1/2 1-7/16 7/16 5.69 5.66 6-7/16 5.56 15/16
6 1 11 8-1/2 1-9/16 3-1/2 1-9/16 1/2 6.75 6.72 7-9/16 6.63 1-1/16
8 1-1/8 13-1/2 10-5/8 1-3/4 4 1-3/4 1/2 8.75 8.72 9-11/16 8.63 1-1/4
10 1-3/16 16 12-3/4 1-15/16 4 1-15/16 1/2 10.92 10.88 12 10.75 1-5/16
12 1-1/4 19 15 2-3/16 4-1/2 2-3/16 1/2 12.92 12.88 14-3/8 12.75 1-9/16
14 1-3/8 21 16-1/4 2-1/4 5 3-1/8 1/2 14.18 14.14 15-3/4 14.00 1-5/8
16 1-7/16 23-1/2 18-1/2 2-1/2 5 3-7/16 1/2 16.19 16.16 18 16.00 1-3/4
18 1-9/16 25 21 2-11/16 5-1/2 3-13/16 1/2 18.20 18.18 19-7/8 18.00 1-15/16
20 1-11/16 27-1/2 23 2-7/8 5-11/16 4-1/16 1/2 20.25 20.20 22 20.00 2-1/8
24 1-7/8 32 27-1/4 3-1/4 6 4-3/8 1/2 24.25 24.25 26-1/8 24.00 2-1/2

A266 Gr. 4 Thermal Properties

Maximum Temp.: Mechanical 400 °C
750 °F
Latent Heat of Fusion 250 J/g
(Liquidus)Melting Completion 1460 °C
2660 °F
Thermal Conductivity 52 W/m-K
30 BTU/h-ft-°F
Specific Heat Capacity 470 J/kg-K
0.11 BTU/lb-°F
(Solidus)Melting Onset 1420 °C
2590 °F
Thermal Expansion 12 µm/m-K

ASTM A266 Flanges Material Standard

ASTM/ ASME A266/ SA266 Carbon Steel Forgings for Pressure Vessel Components
Material Grade Grade 2 Grade 1 Grade 4 Grade 3

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