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EJOT ALtracs® Plus screws are thread-forming fasteners developed for maximum strength values in light alloy assemblies and other non-ferrous metals such as zinc, copper or brass. The ALtracs® Plus is designed for direct assembly into cast holes. Compared to metric screws significant cost savings can be realised because the number of work steps is reduced (e.g. thread cutting). ALtracs® Plus is the improved version of the ALtracs® screw and it achieves strength values which are comparable to metric screw joints of the strength category 10.9.
The new EJOT ALtra CALC® prognosis programme, which is based on the mechanical parameters of many thousand applications and test assemblies, is a valuable support for the pre-dimensioning of direct assembly into light metal. The software contains the fastening parameters of the ALtracs® Plus screw according to material and pilot hole dimension. This way valuable time can be saved during the design phase of a component.ALtra CALC
The thread geometry plays an important role for direct assembly into light metal, since the different material strength properties of steel and light metal require a special design of the steel screw. The 33° screw flank angle forms a considerably stronger female thread compared to 60° threads. The female thread in the weaker light metal material is strengthened by the larger thread root which causes a balanced strength ratio. The asymmetric thread flank results in optimal material displacement and creates a large thread engagement area.
The resulting low installation and high failure torques of the ALtracs® Plus facilitate a broad range for secure installation with simple pneumatic and electric drivers. Torque and torque angle controlled tightening processes are also possible beyond yield strength of the screw since the failure mode stripping or screw fracture can be specified. The circular cross section in combination with various installation depths (1 to 2,5 x d) allows a high amount of flexibility in the choice of the appropriate fastening system. The sharp thread flanks of the ALtracs® Plus in connection with the non-circular thread forming zone enable centred alignment and easy tightening of the screw even in cast holes.