I've been buying and selling imperial based
tools for over thirty years.
These charts help compare and explain
the various imperial standards (Whitworth/BSF,BA and
AF) with metric and list all spanner/socket sizes from 10BA to 60mm at
bottom of page.
Enthusiasts working and repairing older
machinery soon encounter Whitworth and BSF (British Standard Fine) or
Imperial AF (SAE) fixings along with BA (British Association) and possibly
BSC (British Standard Cycle) threads. Metric tools aren't made to fit
these,the correct imperial or inch based tools are available I
prepared the tables on this
much copied page to help explain these Imperial Standards and what tools and
sizes are needed to fit them.
Tel (44) 01472353993 Mobile