This 4th edition of DIN Handbook 193 "Fasteners 5 - Basic standards" The handbook contains essential standards on fasteners, covering such areas as: countersinks and counterbores // widths across flats // thread run-outs and thread undercuts // bolt and screw ends // stud ends and tapped holes for compression couplings // driving features // tolerances for screw threads // key terminology and definitions for fasteners (with three comprehensive multilingual standards containing terminology in nine languages). Compared to the 3rd edition of this DIN Handbook, three standards have been included for the first time and eleven standards have been revised. DIN Handbook 193 is one of a series of six handbooks on fasteners. DIN Handbook 45 "Threads for engineering" is the ideal complement to this series.