Screwed Flanges

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This flange is referred to as either threaded or screwed. It is used to connect other threaded components in low pressure, non-critical applications.


The various types of threaded flanges are as follows:
  • Plain Threaded Flanges
  • Female Threaded Flanges
  • Male Threaded Flanges
No welding is required.
Standards, Dimensions & Weight
Threaded Flanges can be used in very high pressure services and their major advantage is that they can be assembled without welding.
Uses of threaded flanges :
Threaded flanges are threaded in the bore which match an external thread on the pipe. Threaded flanges are used with pipes that have external threads. The benefit of these flanges is that it can be attached without welding.
  • Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
  • They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
  • They are ideal for small diameter piping applications.
  • They are economical and time saving devices.
  • These threaded flanges are normally designed for non-cyclic applications.
  • The flanges are suitable to be used in applications where welding is hazardous.
  • They can be used in highly explosive areas.
Details of Threaded flange

They are the special type of pipe flanges which can be attached to the pipe without welding.

Details of Threaded flange

1. Threaded flange 2. Thread 3. Pipe or Fitting

Threaded flanges are often used for small diameter, high pressure requirements. thread flanges with a hub have published specifications that range from 1/2″ thru 24″.

Size: 1/2” to 60”, DN 12mm to DN 1500mm

Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250

Facing: RF / RTJ
Material:
  • Cabon steel: A105, A350 LF2
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12


Type:Threaded Flanges, TH Flanges, Plain threaded flanges, Female threaded flanges, Male threaded flanges


Packing: plywood case and plywood pallet

ASME/ANSI B16.5 Class 150 TH

Nominal Pipe Size  Outside Diameter of Flange Diameter of Raised Face Thickness of Flanges Min. Diameter of Hub Length Through Hub Thread Length Threaded Min. Bore Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Approximate Weight kgs
NPS O R tf X Y T B W I n 　
1/2 90 34.9 9.6 30 14 16 22.2 60.3 15.9 4 0.41
3/4 100 42.9 11.2 38 14 16 27.7 69.9 15.9 4 0.59
1 110 50.8 12.7 49 16 17 34.5 79.4 15.9 4 0.82
1 1/4 115 63.5 14.3 59 19 21 43.2 88.9 15.9 4 0.99
1 1/2 125 73.0 15.9 65 21 22 49.5 98.4 15.9 4 1.28
2 150 92.1 17.5 78 24 25 61.9 120.7 19.1 4 2.01
2 1/2 180 104.8 20.7 90 27 29 74.6 139.7 19.1 4 3.41
3 190 127.0 22.3 108 29 30 90.7 152.4 19.1 4 3.88
3 1/2 215 139.7 22.3 122 30 32 103.4 177.8 19.1 8 4.80
4 230 157.2 22.3 135 32 33 116.1 190.5 19.1 8 5.45
5 255 185.7 22.3 164 35 36 143.8 215.9 22.2 8 6.22
6 280 215.9 23.9 192 38 40 170.7 241.3 22.2 8 7.57
8 345 269.9 27.0 246 43 44 221.5 298.5 22.2 8 12.42
10 405 323.8 28.6 305 48 49 276.2 362.0 25.4 12 16.47
12 485 381.0 30.2 365 54 56 327.0 431.8 25.4 12 26.80
14 535 412.8 33.4 400 56 57 359.2 476.3 28.6 12 35.21
16 595 469.9 35.0 457 62 64 410.5 539.8 28.6 16 44.61
18 635 533.4 38.1 505 67 68 461.8 577.9 31.8 16 49.19
20 700 584.2 41.3 559 71 73 513.1 635.0 31.8 20 62.62
24 815 692.2 46.1 663 81 83 616.0 749.3 34.9 20 88.23


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