Abstract This second edition cancels and replaces the first edition (ISO 296:1974). Specifies the dimensions of tapers for general use, smaller and larger tapers. The standard sizes of these tapers are given in table 2 (in millimetres) and table 3 (in inches), respectively. Provides for those elements which are threaded, two entirely distinct types of product according to the type of thread, M or UNC (see figures in clause 4).