Self-tapping fasteners

EJOT EVO PT®

The evolution of the plastic direct screw connection

Evolutionary advantages for plastic components

The EVO PT® is the evolutionary further development of self‑tapping screw connections in thermoplastic materials.

With this innovative fastening solution, EJOT has combined for the very first time manufacturing and application technology knowledge with new techniques based on physical computer simulations. The result is a screw that sets completely new standards in plastic direct fastening.

Method / principle

The EVO PT® allows, like conventional direct screw connections, an efficient assembly for plastic components. However, the unique thread-forming zone of the EVO PT® is used here and allows an almost constant insertion torque over the screw-in depth and at the same time offers an optimum centering function due to the specially designed shoulder thread. This ensures that screwed connections can be implemented with process reliability and a long service life.

Applications

Direct screw connections can be found in almost every plastics processing industry. From automotive sectors to manufacturers of electronic components, EVO PT® offers greater process reliability, efficiency and is a key component for modern requirements in lightweight construction and cost efficiency. By consistently removing or omitting costly tapping operations or inserts, considerable cost savings can be achieved.

Product benefits
  • Increased effectiveness and efficiency in all areas
  • Maximum mechanical safety
  • Maximum process reliability
  • Consolidation of parts
  • Error avoidance

Product benefits

There are many good reasons for using our products.

Strength and options.
Point by point.

A more secure approach, high connection quality

The newly developed thread tip of the EVO PT® enables easy and straight placement in the screw hole. The special thread creates an even load distribution over the circumference of the thread flanks in the screwed‑in state, since the screw centers itself automatically in the screw hole during the screwing process. This ensures high repeatability and a significantly improved connection quality.

Less variety of parts, more economic

During the screwing in phase, the innovative form thread produces a torque curve that is almost independent of the screw in depth. This allows smaller installation spaces or a standardization of screw lengths and tightening torques, which directly affects the efficiency of your process chain.

Digital service for optimized components

The digital calculation service EVO CALC® allows you to calculate in advance the torques and preload forces as well as the preload force relaxation under temperature and time. In addition, EJOT provides you with an individual, FEM-supported component analysis, with which you save time and costs – starting with the design of your component.

Detailed description

 

Features of the EJOT EVO PT®

With the EVO PT®, nothing was left to chance. The complete design is re-engineered and focuses on the requirements of users, designers, lean managers and buyers.

The technical features of the EVO PT® have been translated into a consistent focus on benefits and customers and are illustrated in the following video.

Features of the EJOT EVO PT®

© EJOT

02:47

 

Konstruktionsunterstützung

For the EJOT EVO PT® we offer a full service package that guarantees an optimal use of the screw.
In addition to the technical consultation by the in-house "Application Engineering" with an extensive portfolio of technical test equipment, the application validation is supported by digital instruments.

Predesign of your screw connection with EVO CALC®

The EVO CALC® forecasting program developed especially for this screw allows you to quickly and precisely determine all values and information important for your project regarding the installation of the EVO PT® screw.

This includes, for instance, the preparation of a design recommendation, the calculation of the relevant torques, the determination of various forces, such as the preload force at the tightening torque, and the identification of possible failure scenarios in case of overload. The results provide you with immediate information as to whether your assembly is already optimally designed for your requirements or which aspects need to be improved to achieve your optimum.
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FEM analysis – Even more planning reliability with numerical calculation

The calculation of design and assembly parameters can be ensured quickly and with sufficient accuracy using analytical calculation methods. However, the question often arises as to how the preload force behaves in the load case after assembly. In the case of a plastic direct bolted joint, particular attention must be paid to the relaxation, i.e. the time- and temperature-dependent loss of the preload force.

Conventional analytical calculation models are simplistic and ultimately too imprecise to be able to predict this process reliably. For this reason, EVO CALC® has been equipped with an interface to a numerically calculating FEM system (Finite Element Method). In the program, it is possible to create a temperature profile to be simulated, i.e. to define the corresponding load case and to transfer it to the numerical calculation together with the relevant initial conditions and design parameters.

In interaction with complex material models, the FEM system calculates the expected preload force curve and finally the final residual preload force. Time-consuming and cost-intensive temperature tests can thus be reduced to a minimum.

Finite element based calculation (© EJOT)

Finite element based calculation (© EJOT)

Temperature in °C
Clamp load in kN

CAE-Services - Component optimisation and design support (© EJOT)

FEM analysis using the example of real components

© EJOT

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