The purpose of this page is to help new or existing customers find the answers to the most often asked questions received by our technical and sales departments.

We'll try and lead you through, from start to finish, how the best insert is chosen, the most suitable method of installation and if you still need help, the best way to contact us.

Wikipedia description - A threaded insert, also known as a threaded bush, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold threads into a workpiece thereby eliminating a machining operation.


Q: How do you choose the best insert?

Q: What type of material is the insert going into?

A: The material (thermoplastic, thermoset, DMC etc) in which the insert will be installed will directly influence the correct choice of insert, the achievable performance and installation method.

Q: What ‘torque’, ‘pull-out’ and ‘jack-out’ performance is required?

A: Torque is the maximum rotating force (Nm) that can be applied to the insert before it ‘spins’ in the moulding. Pull-out performance is the maximum force (Kg), applied in a direct line, that results in the insert being pulled out of the moulding.
Jack-Out is the maximum rotating force (Nm) that can be applied to the insert before it starts to be ‘pulled-out’ of the moulding and occurs when the design of the two mating parts has not been done correctly.

      NOTE: The performance of any insert is directly dependent on the hole size, material and method of installation.

Q: Does the insert need to be ‘headed’ or ‘un-headed’?

A: The majority of inserts we supply are ‘un-headed’ as they are usually installed ‘flush’ into a blind hole. The ‘headed’ style are used in a ‘through hole’ application to prevent them ‘pulling through’. They can also be used in applications where there is an oversize clearance hole in the mating part preventing a ‘jack-out’ situation and for use as an electrical contact.

Q: Choose the appropriate ‘brand’ of insert?

A: Fitsco offer several different types of threaded inserts to suit all types of applications, materials and performance.


Q: What's the best way to install inserts?

A: There are two methods of installing inserts, 'post-moulded' and 'moulded-In'. The three main methods of installing ‘post-moulded’ inserts are using heat or ultrasonics ; cold and screw-in, each method having it's own advantages and disadvantages. The easiest method of installation is to press the inserts in cold. You will get a better performance if inserts are put in hot using some type of installation machine. The ‘screw-in’ range of inserts has to be installed with specialist equipment and is therefore the  hardest to method of installation, but provides the best performance. Moulded-In Installation is the method that provides the maximum performance, but has the disadvantage of requiring the insert to be installed directly into the ‘mould tool’. This method is mainly used in thermoset or DMC mouldings where cycle times are slower, so the time taken to install the inserts is not too much of a disadvantage. The majority of inserts are ‘blind’ stopping plastic material going inside the insert and contaminating the thread.


Ready to select the right insert?

Ready to select the right insert?



Choose from the following:



"MultiFit" - For 'hot' or 'cold' installation into all types of thermoplastic materials


"HeatFit" - For heat or ultrasonic insertion into all types of thermoplastic materials


"Pressfit" - For cold installation into both thermoplastic and thermoset materials


"ScrewFit" - For 'screw-in' installation into thermoplastic and some thermoset materials


"MouldFit" - For 'moulded-in' installation into thermoplastic and thermoset materials


"RotoFit" - For 'moulded-in' installation into rotational mouldings

Still need help?

Still need help?

                . . . . . then please contact our 'help desk' on:

            T: +44 (1) 952 953533 or email: [email protected]

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