Screwbolts are designed for medium to heavy duty applications in solid concrete of 25MPa or greater.

*Seismic Categories C1 and C2 Anchors qualified under Seismic Category C1 provide capacities in terms of Tension and Shear resistance, while anchors qualified for Seismic category C2 provide anchor capacities for Tension and Shear resistance and Displacement. The concrete cracking effect is taken into account in the assessment for both seismic categories with different crack widths. Seismic Category C2 is more stringent than Category C1. *Option 1 The Option number determines the scope of application for which the fastener performance has been independently verified. The factors determining the Option number include the state of concrete, concrete strength, direction of loading, effect of reduced edge and spacing distances and design method. Option 1 (cracked and uncracked concrete) is one of the most demanding testing regimes.

The Screwbolt exerts no expansion pressure and can be used close to edges without damaging the base material

The Macsim Screwbolt system is based on a completely new fixing concept for anchoring into construction materials. Using threads in metals is standard practice within the engineering industry, as is using woodscrews to cut their thread into wood in the construction industry. Macsim have developed their own self tapping anchor for use in construction materials, such as concrete, stone, brick, block and many more. Thereby, a tried and tested method of fixing for metals and wood to construction materials is applied.
The Macsim Screwbolt thread is designed to give optimum grip within the various substrates, whilst reducing insertion torque to a minimum. Using standard size hammer or percussion drills to drill the hole into which the Macsim Screwbolt is to be fixed. The Macsim Screwbolt cuts its own thread into the substrate as it is screwed in. This self tapping action enables a positive and safe anchorage to be achieved, with the substrate becoming the nut to the Macsim Screwbolt.
Because the anchor cuts its own thread, a safe anchorage is achieved without the need of high tightening forces. There is no expansion with the Macsim Screwbolt and it can be removed and refixed into the same hole, providing the thread is aligned correctly. The preload applied serves only to secure the component being fixed and should not exceed the maximum torque recommended.