Built from the 1950s until the early 1980s, all the Graziano SAG12  lathes had a centre height of 6 inches (152 mm) and a capacity between centres of 32 inches (812 mm). Both shared the same number of thread pitches, these being 30 Whitworth (inch) from  6 to 46 t.p.i and 60 metric from 0.75 to 5.75 mm and the same power sliding and surfacing feed rates, 60 from 0.002" to 0.0188" (0.05 to 0.5 mm) per spindle revolution and at half that rate for cross feed. The eight spindle speeds of 80 to 2000 r.p.m. were also common. Mechanically, the first two versions were almost identical, only the electrical controls undergoing a modest enhancement.
By the late 1970s, the last version - the SAG 12S - was in production. This model was heavily revised, though it did share all the dimensional and technical features of the earlier versions but was styled in an up-to-date angular form. One of the main changes was to the drive system, with the previous 3 h.p. motor replaced by a 4 h.p. one and the range of set speeds being replaced by the option of two continuously-variable low and high rates. The first option was 55 to 360 r.p.m. and 310 to 2000 r.p.m. and the second 80 to 470 r.p.m. and 470 to 2600 r.p.m. The drive system chosen was of the traditional expanding-and-contracting pulley type with changes in ratio made an electric motor causing the pulleys to open and close. 
Screwcutting and power sliding and surfacing feeds were also altered, the Whitworth pitches being reduced to 30 in number but spanning the same 6 to 46 t.p.i. The Metric pitches were likewise halved in number but still ran from 0.75 to 5.75 mm. Power sliding and surfacing feeds remained as before, being 60 in number and running from (a corrected) 0.0019 to 0.23 inches were spindle revolution with the cross feed at half those rates.
The full specification for all models can be found below.