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Our processes

Cold forming as a core process

Use of the ‚cold forming‘ manufacturing process makes it possible not only to manufacture components and semi-finished products with complex designs in a very economical way, it also makes it possible to alter the properties of components and parts in a targeted way.
In addition to realising the highest quality standards, ‚cold forming‘ uses available resources, by subjecting the metallic material, usually starting from a wire section, to defined cross-sectional and thickness changes on horizontal presses in self-designed, multi-stage forming tools. As an alternative, we also offer hot forging for fuse elements with a diameter of up to 80 mm.


Cold forming offers you the following advantages:
No need to heat the formed material
‚Hair’s breadth forming‘ in (near) net shape quality, i.e., with a high degree of mass and form precision
High degree of manufacturing productivity (large quantities)
High surface qualities can be achieved
Resource conservation (reduction in materials, low raw material wastage)
Potential to set defined structural-mechanical properties


The thread is an essential component of mechanical fasteners and it therefore receives special attention within the process chain. Our one and two-spindle thread-cutting machines form and cut the threads in our HEWI products and are subject to constant statistical system process controls.

Heat treatment

There are two continuous QT-furnaces in operation at HEWI. Depending on the material, heat is applied to harden/austenitise the material before it is quenched, making it possible to set specific structural-mechanical properties. HEWI recovers heat from the energy-intensive process and redirects it back to the factory.

Surface coating

Both our galvanic, zinc, zinc alloy and zinc flake coatings are not only corrosion resistant, they also ensure by applying a top coat constant frictional coefficients and optimal installation for our customers.


Within electromechanical processes, the penetration of H2 into a component can lead to hydrogen-induced (delayed) brittle fracture. Hydrogen de-embrittlement/annealing results in the hydrogen effusing from the material, which prevents structural damage.

Plastic component manufacturing

At HEWI we manufacture plastic rings out of a variety of different materials for the production of our fasteners using our own plastic injection machines. Under high pressure, molten plastic granules are sprayed into a die and formed. Thus we are able to produce large lot sizes of complex products at low costs in a very environmentally friendly way.


At HEWI, finishing means the processing of previously pre-formed raw parts in near net-shape quality that need further machining due to their particular contours and tolerances. Depending on output quantity, our rotary machining centres and CNC machines are able to process the raw parts quickly, cleanly and according to the highest standards.


Stable processes are the bedrock of our production control, which is why the performance of our machines and processes is constantly being monitored. In addition, our products are individually checked electronically according to our customer’s specifications where required.