The Engineers' Metric Data Manual and Buyers' Guide is a manual and guide for the British engineering industry in the period of transition from Imperial to metric sizes. This material begins with the abbreviated history and use of the S.I. system. A guide on using the manual and a suggested component coding system for adoption by companies for internal metric use are also explained. This book also presents design data and conversion tables, as well as data sheet for specific parts of the whole engineering design, including fasteners, bearings, bushes, machine tools, fluid sealing, and coupling systems. This book will be valuable to engineers in such transition and will help prevent a serious and avoidable waste of skilled engineering effort.