Thursday, January 26, 2012

Reinforcing notched beam with ASSY Plus VG's
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Friday, January 13, 2012

Producing ASSY Structural Wood Screws/Self Tapping Wood Screws

Punching into raw shape

  • cutting to length
  • head pre-shaping
  • final shaping with AW-drive and label

Pinching of the screw tip

  • no cutting process
  • ASSY Plus tip for wood screws
  • Pias-tip for sheet metal drilling screws

Rolling on the thread

no cutting process when rolling on the thread


The first and foremost used procedures in the production process of a screw are heat treatment processes for case hardening, tempering and annealing. The structure of the alloy is converted to ensure the required mechanical features.
Depending on the carbon content the screw is heated up to a certain temperature which is kept for an extended period of time. Thereby the microstructure is converted and an increase of hardness is achieved through a subsequent quenching in oil.
The now glass-hard (brittle) screw cannot be used in the field yet. In a second process called annealing it is heated up once more. During this process the high hardness decreases and the tenacity improves considerably.


  • Zinc coating for corrosion protection
  • Layer thickness 5µ-12μ
  • Example: blue cremated or yellow zinc coated

Thursday, January 5, 2012

Wood-Concrete-Composite Slab

A wood-concrete-composite is a connection between supporting timber beams and a concrete slab mounted on them. A rigid connection is achieved with shear connectors or screws which transfer shear forces between beams and slab. Wood-concrete-composite floors are utilized when large beam spacing’s or spans must be bridged and high pay loads must be carried after retrofitting the ceiling. This bonding is deemed to be the ideal solution for increasing the load-carrying capacity and stiffness of ceiling systems.