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Stainless Steel Threaded Flanges



Stainless steel threaded flanges specification

Manufacturing Size Face Types Also Called
  • 1/2" to 24"
  • DN15 - DN1200
  • PN 2.5 - PN 400
  • Raised face threaded flange
  • RTJ threaded flange
  • FF threaded flange
  • Screwed flange
  • NPT flange
  • BSP flange
  • Thread flange
How to measure SS Threaded Flange? Temperatures Steam Service
  • O: Outer Diameter
  • C: Wall Thickness
  • R: RF diameter
  • X: Diameter Of hub
  • Y: Length through hub
  • T: Length Of thread (Minimum)
  • Q: Diameter Of bolt circle (Minimum)
220° F 250 PSI
Water Service Key Features of Reducing Threaded Flange Welding Of Thread Flange
100 PSI
  • No welding is required
  • Best for small pipe sizes
  • Used for non-cyclic applications
  • Highly explosive areas
  • Arc-welding (MIG)
  • OAW (oxy-acetylene welding )
  • Brazing and soldering
  • Inert tungsten gas (TIG ) welding
Manufacturing Process Threads Types Surface
  • Plate
  • Cast
  • Forged
  • Male thread
  • Female thread
  • NPT
  • BSP
  • BSPT
  • Ring joint surface
  • Flat surfaces
  • Grooved surface
  • Convex surfaces
  • Concave and convex surfaces
Major Advantage Of Stainless Steel Screwed Flange Application Of NPT Weld Flange Buying Tips Of BSP Threaded Flange
  • No need for welding
  • Easier to assemble
  • Easier to disassemble
  • Petrochemical plants
  • Refinery industry
  • Gas & Oil applications
  • Nuclear power
  • Industrial piping connection
  • O.D.
  • Length
  • Mass
  • Pressure Rating
  • Size
  • End Type
  • Tested
  • Style
  • Type
  • Thickness
  • Materials
Bolt Hole Services Inspection Checklist
4 To 24
  • Polishing
  • Beveling end
  • Cutting
  • MTR certification
  • Coating
  • Marking tagging
  • Impact test
  • Hardness test
  • Tensile test
  • PMI test
  • Visual inspection
  • Material inspection
Types Of Stainless Steel Threaded Flange Wall Thickness Standard
  • Reducing threaded flange
  • Threaded hub flange
  • Threaded blind flange
  • Threaded floor flange
  • Threaded companion flange
  • Threaded closet flange
  • Threaded slip on flange
  • Schedule 20
  • Schedule 40
  • Schedule 80
  • Schedule 100
  • Schedule 120
  • Schedule 160
  • ASME B16.5
  • ANSI B16.5
Most Popular Sizes Production Process Typically Used
½ inch to 6”
  • Raw Material
  • Inspection
  • Cutting
  • Forging
  • Heat Treatment
  • Forging Rolling
  • Final Inspection
  • Rust Prevention
  • Marking
  • Heat Number
  • Packaging
  • Non-toxic systems
  • Low pressure systems
  • Low temperature systems
Connections Standards of Threaded Hub Flange Pressure Rating Manufacturing Standards & Origin
  • ASME B1.20.1 
  • ASME B31.3
  • 150#
  • 300#
  • 600#
  • 900#
  • 1500#
  • 2500#
  • UNI 2276/ 6091 - Italy
  • AWWA - USA
  • ANSI B16.5 - USA
  • ASME B16.5- USA
  • Ghost - Russia
  • MSS SP44 - USA
  • DIN- Germany
  • API-605 - USA
  • PN 10 to PN400- Europe
  • BS 10- Australia and UK
  • BS EN 1092-1 - Europe
  • JIS - Japan
Markings Way Coating Types Machining Process
  • Manufacturer name
  • Size
  • Schedule
  • ASTM material
  • Heat Number
  • Country origin
  • Grade
  • Pressure rating
  • Face type
  • Anti-rust oil
  • Oil black paint
  • Zinc plated
  • Yellow paint
  • Hot dip galvanized
  • Heat treatment
  • Forming
  • Material selection
  • Quality control
  • Forging
  • Machining
  • Surface finish
  • Material cutting
  • Shaping
  • Inspection


Thread flange price

Before ordering compare the NPT flange and reducing threaded flange price with the different suppliers in Mumbai

Thread flange price

(SCH : 40, Class 300) Price per piece in US Dollar

  • 1/2 inch, RF, F304L
  • 1 inch, RF, F304L
  • 1 1/2 inch, RF, F304L
  • 2 inch, RF, F304L
  • 3 inch, RF, F304L
  • 4 inch, F304L, RF
  • 5 inch, F304L, RF
  • 6 inch, F304L, RF
  • US $1.60
  • US $2.27
  • US $2.94
  • US $4.14
  • US $5.22
  • US $6.31
  • US $7.61
  • US $8.68


Buy threaded hub flange and flange with threaded connection for petrochemical plants



Threads of screwed flanges

  • NPT threads
  • BSP threads
  • BSPT threads
  • Plain threads
  • Female threads
  • Male threads


Questions to ask about ASME B16.5 threaded flanges

Questions to ask about ASME B16.5 threaded flanges

Various types Of ASME B16.5 threaded flange

Screwed flanges

Screwed flanges

NPT flange

NPT flange

Reducing threaded flange

Reducing threaded flange

Threaded hub flange

Threaded hub flange

Flange with threaded connection

Flange with threaded connection

Raised face threaded flange

Raised face threaded flange

Threaded blind flange

Threaded blind flange

BSP flange

BSP flange

Threaded welding flange

Threaded welding flange

Threaded floor flange

Threaded floor flange

Threaded companion flange

Threaded companion flange

Threaded closet flange

Threaded closet flange

Male threaded flange

Male threaded flange

NPT threaded flange

NPT threaded flange

Female threaded flange

Female threaded flange

Threaded slip on flange

Threaded slip on flange

Hubbed threaded flange

Hubbed threaded flange

Flat face threaded flange

Flat face threaded flange

Threaded tank flange

Threaded tank flange

NPT weld flange

NPT weld flange

Threaded orifice flange

Threaded orifice flange

Carbon steel threaded flange

Carbon steel threaded flange

Ductile iron threaded flange

Ductile iron threaded flange

Galvanized threaded flange

Galvanized threaded flange



Learn about the Inconel 625 raised face threaded flange installation and Hastelloy c276 threaded blind flange working principle


Carbon steel threaded flange installation

Carbon steel threaded flange installation

Working principle of reducing threaded flange

Working principle of reducing threaded flange


Check online ASME B16.5 threaded flange dimensions and weight chart of BSP flange in KG


Stainless steel threaded flanges dimensions

Stainless steel threaded flanges dimensions
Normal Pipe Size I.D. (MM) O.D. (MM) FF Thickness (T2) (MM) B (Bolt Hole ) Bolt Holes Number BC (Bolt Circle ) R (Raised Face) RF (Raised Face ) (MM) RF Thickness (T) (MM)
1/2 23.62 88.9 14.2 .62 4 2.38 1.38 1.60 .15.74
3/4 28.95 98.55 14.2 .62 4 2.75 1.69 1.60 15.74
1 28.95 107.95 16.00 .62 4 3.12 2.00 1.60 17.52
1-1/4 44.45 117.34 19.05 .62 4 3.50 2.50 1.60 20.57
1-1/2 50.54 127 20.82 .62 4 3.88 2.88 1.60 22.35
2 63.5 152.4 23.87 .75 4 4.75 3.62 1.60 25.4
3 92.20 190.5 28.7 .75 4 6.00 5.00 1.60 30.22
4 117.60 228.6 31.75 .75 8 7.50 6.19 1.60 33.27
6 171.45 279.4 38.1 .88 8 9.50 8.50 1.60 39.62
8 222.25 342.9 42.92 .88 8 11.75 10.62 1.60 44.45
10 276.35 406.4 47.75 1.00 12 14.25 12.75 1.60 49.27
12 328.676 482.6 54.10 1.00 12 17.00 15.00 1.60 55.62
14 360.42 533.4 55.62 1.12 12 18.75 16.25 1.60 57.15
16 411.22 596.9 61.97 1.12 16 21.25 18.50 1.60 63.5
20 512.82 698.5 71.88 1.25 20 25.00 23.00 1.60 73.15
22 563.62 749.3 77.97 1.38 20 27.25 25.25 1.60 79.50
24 614.42 812.8 81.02 1.38 20 29.50 27.25 1.60 82.55


Class 300 threaded flange dimensions

Class 300 threaded flange dimensions
Normal Pipe Size I.D. (MM) O.D. (MM) FF Thickness (T2) (MM) B (Bolt Hole ) Bolt Holes Number BC (Bolt Circle ) R (Raised Face) RF (Raised Face ) (MM) RF Thickness (T) (MM)
1/2 23.62 95.25 20.82 0.62 4 2.62 1.38 1.60 22.35
3/4 28.95 117.34 23.87 0.75 4 3.25 1.69 1.60 25.4
1 28.95 123.95 25.4 0.75 4 3.50 2.00 1.60 26.92
1-1/2 50.54 155.44 28.70 0.88 4 4.50 2.88 1.60 30.22
2 63.5 165.1 31.75 0.75 8 5.00 3.62 1.60 33.27
3 92.20 209.55 41.40 0.88 8 6.62 5.00 1.60 42.92
4 117.60 254 46.22 0.88 8 7.88 6.19 1.60 47.75
6 171.45 317.5 50.8 0.88 12 10.62 8.50 1.60 52.32
8 222.25 381 60.45 1.00 12 13.00 10.62 1.60 61.97
10 276.35 444.5 65.02 1.12 16 15.25 12.75 1.60 66.54
12 328.67 520.7 71.62 1.25 16 17.75 15.00 1.60 73.15
16 411.22 647.7 81.02 1.38 20 22.50 18.50 1.60 82.55
18 462.02 711.2 87.37 1.38 24 24.75 21.00 1.60 88.9
20 512.82 774.7 93.72 1.38 24 27.00 23.00 1.60 95.25
22 563.62 838.2 100.07 1.63 24 29.25 25.25 1.60 101.6
24 614.42 914.4 104.90 1.62 24 32.00 27.25 1.60 106.42


SS Threaded flange weight

NPS Class 150 Threaded Class 300 Threaded Class 600 Threaded Class 900 Threaded Class 1500 Threaded
1/2 0.5 0.9 0.9 2.7 2.7
3/4 0.9 1.4 1.4 2.7 2.7
1 0.9 1.4 1.8 3.4 3.6
1.4 2 2.3 4.5 4.5
1.4 2.9 3.2 6.3 6.3
2 2.3 3.2 4.1 9.9 11.3
3.6 4.5 5.9 13.9 16.2
3 4.1 6.3 7.2 16.2 21.6
5.4 7.7 9.5 - -
4 5.9 10.8 16.7 23.9 32.9
5 6.8 13.9 28.4 37.4 59.4
6 8.6 17.6 36 49.5 74.3
8 13.5 26.1 51.8 77.4 117
10 19.4 36.5 79.7 110.3 196.2
12 28.8 51.8 96.8 146.7 300.2
14 40.5 74.3 116.6 180 423
16 44.1 99 164.7 206.6 562.5
18 58.5 126 214.2 291.2 731.3
20 74.3 146.3 275.4 356.4 922.5
22 83.3 166.5 265.5 - -
24 99 220.5 394.2 666 1271.5


Sealing surface of raised face threaded flange

  • Flat face (FF)
  • Raised face (RF)
  • Ring type joint (RTJ)


BSP flange pressure rating

Temperature °F (Fahrenheit) CL 900 CL1500 CL 2500 CL 150 CL 300 CL 600
-20 to 100 2160 3600 6000 275 720 1440
200 1800 3000 5000 230 600 1200
300 1620 2700 4500 205 540 1080
400 1490 2485 4140 190 495 995
500 1395 2330 3880 170 465 930
600 1310 2185 3640 140 435 875
700 1275 2125 3540 110 425 850
800 1210 2015 3360 80 405 805
900 1165 1945 3240 50 390 780
1000 965 1605 2675 20 320 640
1050 925 1545 2570 20 310 615
1100 770 1285 2145 20 255 515
1150 595 995 1655 20 200 400
1200 465 770 1285 20 155 310
1250 340 565 945 20 115 225
1300 255 430 715 20 85 170
1350 185 310 515 20 60 125
1400 145 240 400 20 50 95
1450 105 170 285 15 35 70
1500 80 135 230 10 25 55


Material of NPT flange

Stainless Steel Threaded Flanges Carbon Steel Threaded Flanges Alloy Steel Threaded Flanges
  • ASTM A105 Carbon Steel
  • ASME SA350 LF2 Class 1/2
  • LTCS
  • SA 694 F42
  • Grade F46
  • A694 Gr F52
  • High Yield F56
  • ASME SA694 Grade F60
  • Carbon steel F70 F65
  • SA 182 Grade F1
  • A182 Gr F5
  • ASTM A182 F9
  • Alloy Steel F11
  • ASME SA182 F22
  • F91 Alloy Steel
Super Duplex Threaded Flanges Duplex Threaded Flanges Titanium Threaded Flanges
  • ASME SA182 Gr F53
  • ASTM A182 F55
  • Super Duplex F60
  • A182 Grade F61
  • ASME/ ASTM A182 F51
  • ASME/ ASTM A182 F44
  • Titanium Grade 2 : ASTM B381 UNS R50400 threaded flange
  • Titanium Grade 5 : ASTM B381 USN R56400 screwed flanges
Inconel Threaded Flanges Incoloy Threaded Flanges Hastelloy Threaded Flanges
  • Inconel 600 : ASTM B564 UNS N06600 NPT flange
  • Inconel 625 : ASTM B564 UNS N06625 reducing threaded flange
  • Inconel 601 : ASTM B564 UNS N06601 threaded hub flange
  • Inconel 617 : ASTM B564 UNS N06617 flange with threaded connection
  • Inconel 686 : ASTM B564 UNS N06686 raised face threaded flange
  • Inconel 690 : ASTM B564 UNS N06690 threaded blind flange
  • Inconel 725 : ASTM B564 UNS N07725 BSP flange
  • 693, MA754, 751, 706, 718, 601GC, MA758, 783, X-750, 602CA, 603XL, 718SPF
  • Incoloy 800 : ASTM B407 UNS N08800 threaded floor flange
  • Incoloy 800H : ASTM B407 UNS N08810 threaded companion flange
  • Incoloy 800HT : ASTM B407 UNS N08811 threaded closet flange
  • Incoloy 825 : ASTM B407 UNS N08825 male threaded flange
  • 903, 907, 945, 925, 926, 832, 330, 25-6HN, DS, 028, 020,909, 945X, MA956, 908, A-286, 27-7MO, 864, 890
  • Hastelloy C22 : ASTM B366 UNS N06022 NPT threaded flange
  • Hastelloy C276 : ASTM B366 UNS N10276 female threaded flange
  • Hastelloy C2000 : ASTM B366 UNS N06200 threaded slip on flange
  • B-2, B, B-3, C, C-4, G-35, G-30, N, G-3, S, W, X
Monel Threaded Flanges Nickel Alloy Threaded Flanges Copper Nickel Threaded Flanges
  • Monel 400 : ASTM B564 UNS N04400 hubbed threaded flange
  • Monel 401 : ASTM B564 UNS N04401 BSP threaded flange
  • Monel K500 : ASTM B564 UNS N05500 thread flange
  • Nickel Alloy 200 : ASTM B564 UNS N02200 sae threaded flange
  • Nickel Alloy 201 : ASTM B564 UNS N02201 flat face threaded flange
  • Copper Nickel 90/10 : ASTM B151 UNS C70600 threaded tank flange
  • Copper Nickel 70/30 : ASTM B151 UNS C71500 NPT weld flange