Abstract
The effective coefficients of thread friction were measured for a number of mild steel and stainless steel nut and bolt combinations. Threads were thoroughly degreased and tested either dry or lubricated with oil, grease or molybdenum disulphide paste. Depending on the materials used and the presence or absence of lubrication the values lay between 0.08 and 1.64. The results indicate the existence of a limiting coefficient of friction with a value of about 0.4. Values greater than or less than this were observed either to increase or to decrease on increasing the tightening speed. The behaviour appears to be consistent with friction arising from the mechanical interaction of surface irregularities. Because the source of friction in screw threads is unlikely to be fundamentally different from that in many other heavily loaded contacts the observations appear to contest the validity of the adhesion theory of friction.
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