Value Through Solutions®


The Evolution of Direct Fastening into Plastic



EVO CALC® Software validates applications, speeding up engineering development time

FEM based relaxation forecast under temperature and time

CAE- Computer-Aided Engineering for complete assembly groups

Standardization potential of single screw length due to unique thread forming zone approach

EVO-Effect (Low installation torque and larger drive to strip window)


Newer Lead-In thread feature for automatic screw centering

Bionic Contour for optimized plastic thread forming

26° flank angle

Oversized initial forming thread


FEM Analysis of the Screw Joint

FEM analysis of the screw joint

Stress Analysis in the Component Under Load

Stress analysis in the component under load


The EVO PT® is the evolutionary development of the self-tapping screw for thermoplastics. With this innovative fastening solution, EJOT has successfully combined production and application technology knowledge with new methods based on physical computer simulations for the first time.

Finite Element Based Calculation

Digital service for optimized components

The digital calculation service EVO CALC® offers the possibility to pre-calculate the torques and clamp loads and the clamp load relaxation under temperature and time. Furthermore, EJOT provides an individual, FEM-based component analysis to save valuable time and money - beginning with the component's design.

Simple and universal design recommendation for EVO PT® screws

Since the forming thread turn generates a virtually constant forming torque, a compensation of different clamping part thicknesses using different counterbore depths is unnecessary. As we assume to have injection-molded pre-holes, which usually have a draft angle of 1°, the pre-hole diameter of 0.85 x d1 is measured at the top of the pre-hole. For better measurability, the pre-hole diameter db at the top of the pre-hole is given as 0.85 × d1.

Innovative thread geometry for high fastening quality and high repeat accuracy

The newly developed "start-of-thread" of the EVO PT® allows for easy and straight positioning in the screw hole. The unique positioning thread thus generates an equal load distribution over the circumference of the thread flanks in the installed condition since the screw is centered automatically in the screw hole during the installation.

Increased economic efficiency through reduced parts variety and higher process safety in assembly

The innovative forming thread turn creates a torque curve virtually independent of the installation depth during the installation phase. The thread-forming zone forms a thread turn into the female material, slightly larger than the clearance the following thread turns require. The following thread turns can penetrate into the plastic without any appreciable friction. This enables smaller installation spaces or a standardization of screw lengths and tightening torques.



Nominal diameter of the screw: d1

Counterbore diameter:
dE = d1 x 1.05

Hole diameter:
db = 0.85 x d1 ± 0.05 mm

Installation depth:
te = 2 x d1 or deeper


dT = external boss Ø

dh = clearance hole Ø

dE = counterbore Ø

db = hole Ø

ts = counterbore depth = 0.1 x d1

te = installation depth

tc = hole depth allowance


Characteristics and features of the EVO PT® screw


Thread forming zoneThread forming zone

Reduced friction during thread forming

Thread-forming torque is virtually independent of the installation depth


tightening torques

Reduced parts variety - one screw, one tightening torque per assembly group

Uniform tube design

Supports carry-over part strategies

Large torque window, thanks 
to small installation torque Ti

High installation reliability

High plant availability

Compensation for process fluctuations


Lead-in thread

Automatic centering of the screw in the screw hole

Stable installation process during initial assembly

Line-integrated, fully automated repeat assembly

Constant, low-stress surface connection

Smaller counterbore depth

Less installation space is required

Usage of purchased parts possible without unloading

Automatic compensation in case of axial misalignment (screw/screw hole)

Compensation of component tolerances

Bionic ContourBionic Contour

Safety margins for challenging applications

Higher fatigue strength

Higher breaking torque

Higher tensile-breaking stress

26° flank angle

Excellent plastic forming

One flank geometry, suitable for all common thermoplastics

Reduced radial load in the component

EJOT EVO PT® – is all about you

Everyone is taken care of

Our role is to support your design work even before your customer orders. Together, we can incorporate the positive benefits of direct fastening into plastic into your assembly application at an early stage. At the end of the day, the new EJOT EVO PT® is all about you, a better result for your customer, and, ultimately, your economic success.

We want you to
• plan and produce in a cost- and time-optimised way
• produce process reliably and without errors
• enthuse your customers with your quality before and after the order placement
• receive the order
• quickly have your product ready for serial production

As a manufacturer of products and components, you not only have to control your production, but every process in your company impacts your overall success. That‘s why we keep an eye on the requirements of all persons involved in the overall process and provide you with measurable advantages thanks to the EVO PT®.

Advantages for

  Design Engineers

  • Maximum mechanical safety
  • Precise performance forecasting
  • No thread inserts necessary
  • Relieving the time budget

Advantages for

  Process Engineers

  • Maximum plant availability
  • Maximum process reliability
  • Consolidation of parts
  • Error avoidance
  • Harmonised assembly concepts


Advantages for

  Quality Managers

  • Reduced effort for sampling, series, and inspection
  • Low error potential
  • Consolidation of parts



Advantages for


  • Competitive purchase prices
  • Consolidation of quantities
  • Reduced complexity
  • Low total project costs
  • Consolidation of suppliers



Your intelligent planning services

When configuring and using EVO PT® screws, you may benefit from these exclusive services:




Preliminary Design of your Screw Joint with EVO CALC® Evo Calc

The prognosis program EVO CALC® especially developed for this screw enables the fast and precise determination of all values and information concerning the installation of the EVO PT®, which are essential for your project.

This comprises, for example, creating a design recommendation, calculating the relevant torques, determining different forces, such as the clamp load at the tightening torque, and presenting possible failure modes in case of overload. The results provide immediate information on whether your assembly group is already optimally designed for your requirements or what has to be done to achieve your optimum.

If you have any further questions, please do not hesitate to contact your application engineer.

Details are taken from the prognosis program EVO CALC®.

Screenshot of the Ejot Evo Calc



  • Prediction of torques and clamp loads
  • Early identification of failure risks
  • Downsizing suggestion
  • Saving of component tests

Additional Family Products


Delta PT Logo
New Thin Thread Technology for Thermoplastics

    Data Sheet(s)    

EVO PT® Brochure   EVO PT® Flyer