Northern Manufacturing Exhibition 30th September & 1st October 2015

The Tappex Group of Companies, incorporating Tappex Thread Inserts and Pressavon are pleased to confirm that we’ll be exhibiting at the Northern Manufacturing & Electronics Exhibition.


The exhibition is to be held on the 31st September & 1st October 2105 at Manchester’s Event City, and tickets are free when you pre-register by clicking here…


Tappex, the Uk’s leading manufacturer of threaded inserts for plastics, composites, metals and woods have specialised in thread insert fasteners since 1956. Our knowledgeable sales engineers will be on hand to answer any queries you might have about about selecting the right insert for your application, to discuss your latest projects involving inserts and to demonstrate our range of installation tooling, including the Flexi-Arm pneumatic screwdriver, heat inserter machine and hand tools. We have some useful videos of our installation tooling on our You-tube channel, but why not come and try the tools out for yourselves.

Pressavon are a first and second tier supplier of bespoke progression tooled bracketry, primarily to the automotive industry and based in Stratford-Upon-Avon for more than 50 years.

Our Pressavon engineers will be available to discuss our range of products and services including bespoke progression Tooled Bracketry, second operation welding and sub-assembly and our speciality – fluid pipe bracketry for automotive applications .

We look forward to seeing you there. 

In the meantime, if you have any more urgent requirements, give us a call on 01789 206 600 or email us

Tappex Thread Insert Installation Tooling – for self tapping Inserts

The Original FlexiArm – Only available from Tappex Thread Inserts Ltd

Tappex flexi arm with pneumatic screwdriver

Tappex Double flexi-arm with pneumatic screwdriver

The Tappex FlexiArm and Desoutter screwdriver combination offer a simple to set up and easy to use solution for rapid installation of self threading inserts into plastics, metal alloys, wood or the latest engineering composite materials.

Quick & simple set up.

Simply insert a Tappex production driver (with 1/4″ hex drive) into the Desoutter pneumatic screwdriver and adjust the installation torque. Once the torque is set, the tool will reliably install thread inserts to the correct depth with consistent torque every-time.

Upto 3 arms can be fitted to a single mounting column, this allows you to install several different sizes of threaded inserts from one machine location.

The FlexiArm is fully adjustable, so ensures that the insert will be installed square to the workpiece.

The FlexiArms Ergonomic design, with counterbalanced and spring loaded arms ensures the resting position can be adjusted to offer the optimum operator comfort and speed of installation. With the weight of the driver being supported by the spring loaded arm, operator fatigue is greatly reduced.

Ultimate flexibility

The desoutter screwdriver is renown for being the best quality pneumatic screwdriver and that’s why we selected it for use with the Tappex FlexiArm. We offer both a 510 rpm auto or manual reverse and an 1100 rpm auto reverse. The FlexiArm has a range of upto 800mm and can install inserts into mouldings or assemblies at different heights with a single set up.

Increased Speed of installation

The FlexiArm can offer increased installation speeds compared to heat staking, cold pressing or ultrasonic installation. The machine is also compact enough to be installed alongside the moulding machine, allowing the operator to install inserts immediately after moulding, utilising the downtime during cycle time.


Tappex provides a 12 month return to base warranty on the Desoutter Driver and the cast iron construction of the FlexiArm ensure that the product will stand up to the rigours of the shop floor environment.

For a video showing the Tappex FlexiArm in use, please follow this link to our Youtube Channel…

Alternatively If you would like to know more about the Tappex range of installation tooling or to book a no-obligation demonstration of the FlexiArm machine please give us a call on +44 (0) 1789 206600 or get in touch using the contact form below.

Application Torque – Thread Inserts for Plastics


It is not always possible to apply the same tightening torque to a plastic assembly as a metallic one. Often there are good reasons why it might be required to but the majority of plastics are relatively weak and all suffer from creep to a greater or lesser degree. However in a carefully considered application and with the right Tappex thread insert it is possible to work around, and sometimes achieve, the same tightening torques that may be applied in a purely metallic assembly.

Key to this consideration is the support offered to the insert. The plastic the insert is installed into is known. As a result it is possible to make a reasonable estimation of what pull out load and what radial torque it might withstand. If the insert is considered in isolation in the plastic the radial torque figure will give a misleading view of the performance capacity of the application as a whole.

The application torque is entirely different and takes into account all the elements of the assembly and the interaction between those elements. It is a much more realistic view of the torque performance that can be expected. Considering an ideal situation, here the mating part would be metallic and has a hole in it that is slightly larger than the outside diameter of the bolt that is passing through it and into the insert in the plastic moulding. The metallic mating part is against the moulding face there is no gap or gasket.
In this situation, as torque is applied to the bolt, after the head of the bolt has contacted the mating part, a pull load will be transmitted by the thread helix to the insert. Initially the insert will resist this load until it reaches a magnitude that the plastic surrounding the features of the insert cannot withstand. The insert will move, the plastic flowing, allowing the insert to come into contact with the metallic mating part. It should be noted that this movement should be restricted to a maximum of 0.3mm by the correct location of the insert. This prevents it partially failing in the plastic, whilst providing a clamp condition for the mating part against the face of the plastic moulding. Once the insert is in contact with the mating part the situation changes, the insert can no longer move in the plastic, any further torque applied to the bolt generates tension. This tension forces the end face of the insert against the metallic mating part, the friction between these faces creates a clamp that resists the torque applied.

In addition it is worth remembering that friction between the bolt head and mating part and between the male and female threads results in losses. So only a proportion of the additional applied torque is converted into tensile load, this can be quite significant depending on the frictional characteristics. The contact between the end face of the insert and the metallic mating part is often the major component resisting the radial component of the torque applied to the bolt. In this ideal situation it will sometimes be the bolt or the internal thread in the insert that becomes the limiting factor. The application torque, in this instance, would be much higher than the pure radial torque that the insert alone will withstand in the plastic.

If you have an application you’d like our help with simply send us your details on the form below, alternatively you can give us a call on +44 (0) 1789 206 600 or send us an e-mail to

Tappex Thread Inserts – Coming to a US State near you!

Tappex have for many years supplied Threaded Inserts directly to a great number of OEM’s across the United States of America.

Following the recent success story that was the NIFMSE (National Industry Fastener & Mill Supply Expo) in Las Vegas…

Tappex in las vegas


Tappex received a great deal of interest from many US based technical distributors.

We are currently working our way through the list of potential distributors and look forward to bringing you more information soon.

For anyone that didn’t get chance to see us and would like to discuss becoming a technical distributor for Tappex Thread Inserts,

please do give us a call on +44 1789 206 600 or e-mail us on


We’d like to say A big thank you to everyone who came to see us at the show and indeed to everyone who made us feel very welcome.

Looking forward to next years show already!

Interplas 2014 – leading Industry event – Will you be there…?


Interplas-Exhibitor - email footer image.Interplas Exhibition 2014 – Stand Number G91

Tappex will be exhibiting at Interplas 2014 on 30th September to 2nd October.


Interplas is the UK’s leading plastics industry event, covering all of the manufacturing processes, technologies and services essential to the plastics sector.  

Tappex are a family owned organisation and the largest UK manufacturer of threaded insert fasteners for plastics, composite materials, woods and light alloys. Tappex are located in the town of Stratford upon Avon and our product has been manufactured here since 1956.

The Tappex product range consists of 23 standard product families with many variations and geometrical differences, offering a solution for materials including thermoplastics and thermosetting plastics, composite materials, structural foam, metals, light alloys and wood.

With a wealth of experience in manufacturing fixings for a vast array of industries including Automotive and Motorsport, Rail, Marine, Aerospace, Telecommunications and Satellites, Medical, White goods and farming. Tappex have the right solution for your insert application.

Come and find out more about Tappex, our product range and the technical services and support that we can offer your organisation. Meet our knowledgeable sales engineers, discuss your latest projects and try out our range of thread insert installation machines including the…

Tappex Heat Installation Tool… 

Heat Installer

and Tappex Flexi-Arm Pneumatic Screwdriver


We look forward to seeing you there…

Latest blog post on Tappex self threading thread inserts for metal, plastics, composite materials and wood

Tappex® has acquired, since it was established in 1957, a comprehensive knowledge of the application requirements of Threaded Inserts fastening across global Industries. In recent years, in particular,  our range of self-threading inserts have been progressively developed to include new products necessary to meet the demands of the metals processing industries and more critical customer applications.

Such critical applications include: Castings, machined & sometimes fabricated parts produced from Light metal alloys i.e. Aluminium, Zinc & Magnesium. Our inserts have been extensively trialled and supplied to customers around the world, on land, sea, air & even in space. Our inserts are of the self tapping type installed into either cast or pilot drilled holes to suit customer’s product manufacturing processes.

TRISERT-3 brass inserts


Self Tapping Plated Steel or Stainless Steel Insert. Self Threading / Post mould installation

The Tappex Trisert-3 has three cutting features to provide a balanced cutting action and reduced installation torque. The Trisert-3 is suited for critical applications and is available in two lengths, regular and long, and is based upon the Trisert Reduced Headed design.

Ensat Threaded Screw Inserts


Threaded Screw Inserts

The use of self-tapping thread inserts has significant advantages over pre-tapped holes, moulded-in inserts and wire thread inserts. They eliminate close tolerance holes required for tapping directly into the base material, damaged tools and low productivity resulting from moulded-in inserts and the time consuming process of placing wire thread inserts into pre-tapped holes. The trisert 3 range offers engineers an easy to fit alternative to traditional thread repair products such as helicoils.

To find out more about our inserts please click the link to visit our webite…

Alternatively if you would like some advice or you have a design or application that you’d like to discuss with our applications engineers, please give us a call on 01789 206600, or drop us an e-mail to


Brass Thread Inserts for Plastics

Tappex® has acquired for over 57 years comprehensive knowledge of the application requirements of Threaded Inserts fastening across global Plastics Industries. Our thread inserts have been designed for plastics installations in mind, have been extensively trialled and supplied for more than half a century to customers around the world, on land, sea, air & even in space applications.

Industries on a global basis specify a wide variety of plastics. Tappex thread inserts, both standard products and customer specials have been developed to meet the many different demands of these different plastics. The manner in which they are used dependant upon customer application(s).

In overview, groups of Industry plastics include:

  • Thermoplastics – rigid at room temperatures but soften at elevated temperatures, ultimately melting if of Amorphous structure i.e. ABS, Nylon (depends on grade), PVC & Polycarbonate OR if of a Semi-crystalline structure whilst these do not behave in the same way, they do have a well-defined melting range i.e. PE, PP & PEEK are good examples
  • Thermosets – once formed through molding, for example, they chemically change such that they cannot be physically re-formed /re-shaped, but are characteristically quite robust and stable at elevated temperatures i.e. Automotive ‘under hood’  installations
  • Foams – limited suitability for threaded inserts unless the holes are suitably cored. Tappex can offer a product for certain applications after further consultation and/or testing, where appropriate
  • Elastomers – rarely suitable for threaded inserts although Tappex always prepared to give some technical consultation
  • Composites – and growing in progressive usage, composite materials which may incorporate combinations of plastics, wood based fibres and/or light alloys can be supported by Tappex, after consultation, either with a Thread insert or bespoke fixing solution

For further details please visit our website or talk to our experienced applications engineers on 01789 206600.