1936 1960 SOCKET CAP SCREW SIZE COMPARISON CHART

Socket cap screw chart showing the dimensional differences between the old 1936 series and the adoption of the USA series in 1960; in practice, the UK stayed with the original1936 series but USA companies in the UK and Europe moved to 1960 making a more complexed market. 

 

1960 1936 chart

FASTENER dimensional differences