Experts in the development and manufacture of precision fasteners,
components and systems, specializing in thin sheet attachment solutions.

Frequently Asked Questions – SI® Threaded Inserts For Plastics

Fastener Installation | FAQ – PEM Brand Fasteners | FAQ – SI Threaded Inserts For Plastics |FAQ – Presses |Glossary of Terms | Anatomy of Self-Clinching Fasteners | Self-Clinching Fastener Handbook (PDF)

 

  • Are inserts available with NPT threads?

NPT threads are not available as a standard. We may be able to do it on special order.

 

  • Are these inserts RoHS compliant?

The RoHS compliant status of all SI® cataloged fasteners can be found in the RoHS lookup tool.
 

  • Do the inserts work in wood?

We offer metal inserts that are designed to be cold pressed into plastic. Although these inserts are not designed to be pressed into wood, they may work if used with an adhesive. Testing this product in your application is recommended. We will be happy to provide technical assistance and/or samples for this purpose.

 

  • Do you have performance data for a certain insert into a certain material or how does the insert perform in a certain type of plastic material?

Performance is dependent on fastener type, installation process and material. Some of this data is available in the SI® bulletin. If the specific information that you require is not shown in the bulletin please contact us at [email protected] for further information. We can supply you with free fastener samples so that you can perform your own testing or depending on the application do the testing for you here in our technical lab.
 

  • Do you sell installation equipment?

Currently we do not sell equipment for installing SI® brand threaded inserts for plastics. For your convenience, listed below are suppliers of ultrasonic and thermal insertion presses:
www.sonics.com

www.sonitek.com

www.sonobondultrasonics.com

www.ultrasonicseal.com

 

  • How much installation force is needed to install inserts?

Installation forces are dependent on fastener type, installation process and material. Some of these forces are available in the SI® bulletin. If the specific information that you require is not shown in the bulletin please contact us at [email protected] for further information. We can supply you with free fastener samples so that you can perform your own testing or depending on the application do the testing for you here in our technical lab.

 

  • What is the recommended temp for heat staking?

As a general rule, try setting the heat staking machine temperature 50˚F/10˚C higher than the published melt temperature of the plastic. Testing this product in your application is recommended. We will be happy to provide technical assistance and/or samples for this purpose.

 

  • What would be the best type of insert for me to use? Molded-in, heat/ultrasonic, or press-in?

Click here for more information on the types of inserts to consider. If you require further information please send your specific question to [email protected].

 

  • When installing a SI® type insert for plastic, what is the recommended wall thickness for the boss?

The boss thickness for an insert is very dependent on the material being used as well as the mold configuration creating the hole. As a rule of thumb, 2X the part diameter is usually sufficient, however, if there is a potential for knit lines along the boss due to the mold configuration, this diameter should be increased.

  • Why are there two versions of the IUA/IUB/IUC inserts for the M3 and M5 thread sizes?

The M3 thread in the #4-40 body and the M5 thread in the #10-32 body have a very thin wall. Therefore, we offer the IUAA/IUBB/IUCC inserts for applications that require a larger body diameter.

 

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