E-Z LOK™ Threaded Inserts for Thermoset Plastics


To keep thermoset plastics from splitting or splintering, it's important to use expansion plastic threaded inserts specifically designed for the job. E-Z LOK™ threaded inserts for thermoset plastics are made for easy press-in installation that reduces the risk of damage while still providing a powerful, secure thread for fasteners.

We carry two main kinds of threaded inserts for thermoset plastics: E-Z Press™ Inserts and E-Z Fin™ (Finserts). Both are available in brass and in a variety lengths and internal thread sizes.

Features of of E-Z Press™ Inserts & E-Z Fin™ (Finserts) for Thermoset Plastics:

  • Reduce the cost of moldings
  • Minimize reject waste from misaligned or faulty inserts
  • Eliminate need to "chase" threads after molding
  • Easy press-in installation
  • Minimize splintering and splitting
  • Proper installation without precise hole depths
  • E-Z Press™ inserts available in stainless steel for internal threads #2 to ¼ (and ⅜ in the 240 Series)

Important Note: Hole size requirements can vary depending on the materials and tools being used. We recommend you test your particular application before ordering your inserts for thermoset plastics. Samples may be provided to distributors upon request!

Looking for other threaded inserts for plastic? View the rest of our selection or head to the E-Z LOK™ Knowledge Base for additional information.


Thermoset Plastics vs Thermoplastics: What's the Difference?

The phrases "thermoset plastics" and "thermoplastics" are often used together. But what's the difference between these two types of plastic? The answer is actually quite simple. Thermoset is a material that strengthens when heated but can't be remolded or heated after the initial forming. Thermoset plastics, on the other hand, can be reheated, remolded and cooled as necessary without causing any chemical changes.

Our E-Z Press Inserts and E-Z Fin (Finserts) are perfect solutions for thermoset plastics and provide many benefits like minimal splitting and easy press-in installation. E-Z Press Inserts are also designed to work well with thermoplastics. Continue reading to learn more about these inserts and the powerful applications they can provide.

What are some examples of thermoset plastics?

Some common examples of thermoset plastics include:

  • Epoxy
  • Silicone
  • Polyurethane
  • Phenolic

What are some examples of thermoplastics?

Thermoplastics are often found in a variety of manufacturing products like non-stick cookware and laboratory equipment. Some common examples of thermoplastics include:

  • Acrylic
  • Polyester
  • Polypropylene
  • Polystyrene
  • Nylon
  • Teflon

How can I be sure I'm choosing the right insert for thermoset plastics?

At E-Z LOK, we provide dimensional drawings for every part so that you can be sure that the one you purchase meets your exact specifications. Check out our dimensional drawings for plastic to help you get started. For more assistance, contact our support team today!

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