Sq. head or Robertson. The square generate is exactly what it sounds like - sq.. Whilst simpler to drive than Philips head screws, these aren't as secure as star-headed screws. This sort is commonly present in pocket gap screws. But for a few, it could be of relevance depending upon the volume of material which the root from the screw will occupy

DIN benchmarks are still legitimate for products and solutions owning no ISO or EN benchmarks. DIN specifications that start with “DIN V” (“Vornorm”, which means “pre-situation”) are the results of standardization do the job, but thanks to selected reservations over the information or as a result of divergent when compared to a standard