"INTRODUCTION This Item presents data on the elastic stresses arising in flat plates@ bars@ strips or lugs from the insertion of a circular interference-fit pin or bush of similar or different material. Section 3 deals with solid pins@ Section 4 deals with bushes and Section 5 deals with the juxtaposition of two identical interference-fit pins or bushes. The data are based upon two-dimensional analyses and therefore only give the average stress through the thickness of the plate or strip. Local deviations away from the average value are unlikely to be significant except perhaps where taper pins are used. The data apply strictly to isotropic materials that obey Hooke's law@ but may be used without significant error for most engineering materials. If during loading of the assembly the limit of proportionality of one (or both) of the materials is exceeded the residual stresses due to the interference-fit will be reduced. It should be noted that the degree of interference will be considerably reduced if significant creep takes place. If the interference-fit pin or bush is additionally held@ for example by means of a taper pin or a screw inserted from the side or inserted parallel to the centre line on the interface@ the stress distribution will alter and the data of this Item will not be applicable. Throughout this Item the term ""bars or strips"" applies to bodies having solid rectangular sections."