EJOT ALtracs® Plus Screw
In order to fulfil these increased technical demands for joints of high-strength and dynamically loaded light metal components, EJOT has optimised the reliable ALtracs® screw. The objective of this improvement was to obtain a self-tapping fastener, with assembly parameters similar to a conventional metric 10.9 machine screw.
In modern assembly lines cost saving and component optimisation are a decisive competitive factor. By omitting production steps such as drilling, thread-cutting, cleaning as well as optimisation in the field of tooling, warehousing and shorter cycle times, the total costs of a screw joint can be reduced by up to 30% with the use of a thread-forming screw.
Shorter insertion depths
The metric pitch and the specific 33° thread flank of the ALtracs® Plus leave a larger thread root in the "weaker" female thread of the light alloy. This geometry allows a higher loading of every single turn of thread and the new design of this fastener reaches the failure criterion screw fracture at clearly shorter insertion depths.
Lower installation and higher stripping torques offer a larger margin for the safe assembly with common pneumatic and electric screwdrivers. The even load distribution on the circular screw cross section of the new ALtracs® Plus promotes a high retention of the clamp load - even under thermal and dynamic stress.
Compared to self-tapping screws with a 60° flank angle, the ALtracs® Plus screw low-damage displacement of the light metal enables a low installation torque. This is realised with an optimised screw point design. The thread flanks in the screw point are smaller in diameter just like the previous ALtracs® geometry, but the "Plus" is also tapered to the front. This way the first threads can enter the female material much easier.
Multiple repeat assemblies
The new ALtracs® Plus also offers additional safety in the assembly process because of multiple repeat assemblies. Important in case of repair: a metric screw is completely interchangeable and can be fastened into the tapped hole.
Comparison of the thread design of a metric screw and the EJOT ALtracs® Plus shows that the ALtracs® Plus screw "strengthens" the female thread.
The advantages of the EJOT ALtracs® Plus screw at a glance:
- Lightweight construction suitability: The optimised thread geometry of the ALtracs® Plus facilitates the use of smaller and shorter screws, but with consistently high strength values
- Minor loss of clamp load under high dynamic and thermal stress
- High vibration resistance without additional safety elements
- High assembly safety due to low installation torque
- Improved ergonomics for manual assembly work
- Repeat assembly possible
- In case of repair a metric screw can be used