Threaded fittings are threaded fittings. Threaded fittings are fittings that are connected to a pipe by internal or external threads and are in most cases no more than 4 inches in size. Commonly used in water gas pipes, small diameter water pipes, compressed air pipes and low pressure steam pipes, etc. A pipeline is formed by connecting with a threaded pipe end. Appropriate glue (such as thick white paint, lead monoxide glycerin glue, etc.) can be applied to the thread to ensure sealing.

Threaded Fittings Catalog:

Internal teeth, external teeth, live joints, elbows (elbow), tees, crosses (crossheads) and reducers
Galvanized pipe fitting suppliers will share with you the manufacturing standards and production materials of threaded pipe fittings.
Manufacturing standard: GB/T 14383, ASME B16.11, BS 3799, MSS SP 83
Production material:

  1. Cast steel pipe fittings
  2. Cast iron pipe fittings
  3. Stainless steel pipe fittings
  4. Plastic pipe fittings
  5. pvc pipe fittings
  6. Rubber fittings
  7. Graphite pipe fittings
  8. Forged steel fittings
  9. PPR pipe fittings,
  10. alloy pipe fittings
  11. PE pipe fittings
  12. ABS pipe fittings

How to Make Threaded Pipe Connections

Many pipe threads including black, galvanized, and PVC are tapered, meaning that the thread is smaller on the end and gradually gets bigger as it goes up the pipe. As fittings travel up the thread, the connection becomes tighter, but not liquid-tight. Thread sealants are used to get a liquid-tight connection. Teflon tape or liquid thread sealants, otherwise known as pipe dope, are used to fill the space in between the threads for a sealed connection, before using a pipe wrench to ensure a tighter connection. To make a sealed connection using the proper teflon tape for the application, wrap the tape clockwise 2-3 times. Teflon tape does not have any adhesion so be sure to wrap the tape tightly to form a solid seal. When using liquid thread sealant, brush the sealant all the way around the thread. The sealant will dry over time and slightly expand to create an airtight seal between the pipe and the fitting. A combination of both teflon tape and liquid thread sealant can be used by first applying the teflon tape, then following with the liquid thread sealant. For older pipes with unreliable threads, a combination of liquid pipe sealant and wicking string can be used. After applying the liquid thread sealant, wrap the wicking string clockwise into the spaces between the threads. When the connection is made and liquid touches the wicking, the string will expand slightly creating a seal. After the desired sealant is applied, hand tighten the fitting onto the pipe. Then, tighten the fitting with a pipe wrench until it’s very tight, ensuring not to overtighten and risk cracking the pipe.

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