Threaded InsertsThreaded inserts are blocks of material with a threaded hole that are pressed or molded into a part, usually made of a different material. The materials used for making threaded inserts are metals such as brass and copper, and plastics such as PVC and PTFE.

 

Types

There are many types of threaded inserts depending on the material used to create them. Examples include:

 

  • Threaded brass insert
    • A threaded brass insert has an internal thread and can be used as socket head or button head machine screw. A threaded plastic insert is a spiral ridge on the end of a pipe that enables pipes to be joined together. T A threaded brass insert has a deep groove for maximum pull out resistance. Knurling such as diamond, straight, and unidirectional are available in a threaded brass insert.
  • Threaded plastic insert
    • A threaded plastic insert is more efficient than a threaded brass insert in the respect that it can withstand more pressure.

Other threaded inserts are commonly available.

 

Video Credit: Acme Industrial Company via YouTube 

 

Features

Threaded inserts reduce risk of cracking of installation material. A threaded insert with full thread is available in sizes ranging from M1.6 to M64+ in diameter. A threaded round insert consists of a tube with threads around its circumference.

 

Threaded InsertsA threaded round insert is specified by tube thickness, thread, and height. Modern threaded plastic inserts are stipulated by a measurement of the outer diameter (OD), which is measured over the pipe thread in the case of a male pipe. To be sure that the pipe thread will match, threads per inch (TPI) are also measured. The inner diameter (ID) is sometimes used when buying PVC pipes. The glass-reinforced nylon body is molded around the threaded brass insert ensuring that the insert stays put in even the toughest conditions. A threaded tube end is the easiest and most cost-effective way to attach mounts and glides to the tubes and pipes commonly used to construct frames, conveyor bases and industrial machinery.

 

Nuts and bolts are the most common threaded fasteners. A threaded stud is a fastener which is threaded at both ends with an unthreaded shank in between.

 

Failure of a threaded fastener generally occurs in one of three modes:

 

  • Failure through the shank or threaded section of the fastener
  • Thread stripping of the external thread
  • Thread stripping of the internally threaded member.

Threaded inserts are designed and manufactured to meet most industry specifications.

 

Applications

Threaded InsertsThreaded inserts are used in many applications. Examples include:

 

  • Instrumentation
  • Telecommunications
  • Other plastic cases assemblies.

Threaded inserts should adhere to American National Standards Institute (ANSI) standards. 

 

Standards

 

  • ADS RS 746 - Tapped Hole & Counterbore Details for Thinwall Inch Threaded Inserts - Long and Short Series
  • ISO 6410-2 - Technical Drawing - Screw Threads and Threaded Parts - Part 2: Screw Thread Inserts
  • NAS1836 - Insert, Molded In, Blind Threaded, Self-Locking, Nonself-Locking, Lightweight, Sandwich Panel

References

Image Credits:

 

Alcoa Fastening Systems | Berg W.M., Inc. | Jergens, Inc.