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Threaded Flange

Threaded flange is connecting with pipe without welding. It is similar to slip on flange or a socket weld flange, fitted with a tapered thread (screw) inside the flange bore that is mounted on the pipe with corresponding external threads. In some cases a seal weld also applied in conjunction with threaded pipe flange.

Our Supply Range:

  • Standard: ASTM A105, ASTM A182
  • Material: Carbon Steel, Stainless Steel, Alloy Steel
  • Size Range: 1/2”, 1”, 2”, 3”, 4” to 24”
  • Pressure Class: Class 150 to 2500

Though threaded pipe flange is available in different dimensions, threaded fittings mostly is used in small diameters pipeline. (Below 4 inch normally.)

On the other hand, it is not compatible with a pipe system in thin wall thickness, since there is no space for doing the threading.

Threaded Flange Types

There are two types of threaded flanges. One is to seal the two pipe ends with a certain sealing surface and a lens pad. This type of flange is mostly used for ammonia production. But it has been used less recently, and the lens pad has been replaced by a metal ring.The other type is the same as a normal flange, sealed with two flange sealing faces.

Convenient Installation and Maintenance

The threaded flange is screwed to the threaded pipe by the thread, which is processed in the inner hole of the flange. So It does not need to be welded. Therefore, it became so convenient for installation and maintenance comparing with other flange types, such as slip on flange, socket weld flange etc.

Application in Special Circumstance

Threaded flanges are used where it is difficult to weld or cannot be welded, such as threaded flanges used to protect the galvanized layer of pipes. In addition, It should not be used on pipes with repeated temperature fluctuations or above 260 ℃ and below -45℃ as well.In ASME B31.3 standard it defines:Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.

Related Products

  • Weld Neck Flange
  • Blind Flange
  • Socket Weld Flange
  • Slip On Flang
  • Lap Joint Flange
  • Threaded Flange
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