The Fatigue Strength of Threaded Connections

Published information on the strength of threaded connections subjected to dynamic loading has been surveyed and summarized, with particular reference to high-duty applications. After a consideration of the load distribution and the concentration of stress at the thread roots, the subject is discussed from the following viewpoints: Effect of thread form; effect of method of manufacture; effect of degree of tightness; methods for improving performance; special modifications in design. In general, the basic principles to be followed in the design of high-strength bolt and stud assemblies are outlined, the reasons underlying them explained, and evidence in their support given when possible.