What Is A STI Tap? - Hangzhou GSR-Threads Tools Co., Ltd.

28 Jul.,2025

 

What Is A STI Tap? - Hangzhou GSR-Threads Tools Co., Ltd.

S.T.I. (Screw Thread Insert) Taps are special taps for helical coil wire screw thread inserts, which provide positive means for protecting and strengthening tapped threads in any material.The insert offers a stronger tapped thread for a balanced distribution of loads. 

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These STI taps are correctly sized to produce an internal thread that accommodates a helical coil wire screw thread insert. Metric sizes are referred to as thread pitch. Chamfers are the length of the tapering threads at the front of the tap.The insert, in turn, will accept a screw thread of the nominal size and pitch at final assembly. Screw thread inserts provide stronger tapped threads (stronger assemblies) due to a more balanced distribution of loads throughout the length of thread engagement.

What is the difference between HeliCoil tap and regular tap?

A screw thread insert tap, or STI tap, operates in the same manner as a "standard" tap. However, the difference is that STI taps produce an oversized thread specifically for E-Z Coil™ inserts.STI taps are ideal for softer metals that require a strong threaded insert.

What are thread inserts used for?

Thread forming STI Taps are used to form internal threads by displacing the metal without producing chips in large holes. They are ideal for aluminum, brass, copper, steel and soft metals.

Threaded inserts are commonly used in plastic casings, housing, and parts to create a metal thread (typically: brass or stainless steel) to allow for screws to be used in the assembly of many consumer electronics and consumer products.

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STI Taps for EZ Coil™ Threaded Inserts - E-Z LOK

STI Taps for E-Z Coil™ Threaded Inserts

A screw thread insert tap, or STI tap, operates in the same manner as a "standard" tap. However, the difference is that STI taps produce an oversized thread specifically for E-Z Coil™ inserts.

 

During installation, the threads cut by an STI tap allow the E-Z Coil™ insert to compress and form into the desired thread size, guaranteeing a snug fit. STI taps are ideal for softer metals that require a strong threaded insert.

 

E-Z LOK’s E-Z Coil™ STI taps are manufactured from high-speed steel (HSS) for superior durability, and we offer them in a wide range of sizes to meet your unique requirements.

1. What are some examples of softer metals that require a strong threaded insert?

STI taps are ideal for projects involving the following soft metals:

  • Cast iron
  • Mild steel
  • Aluminum

2. What makes E-Z LOK's STI taps so durable?

Our STI taps are durable and dependable thanks to high speed steel. They have the following characteristics:

  • Excellent toughness
  • High wear hardness
  • High retention of hardness and red hardness
  • High working hardness

3. I have a question that wasn't answered here. Where can I ask it?

If you have a question about STI taps or any other of E-Z LOK's products, we're happy to provide our expertise. Fill out our contact form or reach out to our customer service representatives at the following number: 800-234-. We also recommend checking out our additional resources below for more information about STI taps.

For more Sti Tapsinformation, please contact us. We will provide professional answers.