This standard BS G 154:1958 Screws with captive washers for aircraft is classified in these ICS categories:
49.030.20 Bolts, screws, studs
This British Standard specifies the material, dimensions, finish and part numbers of B.A. screws with captive washers for use on aircraft.
NOTE A table is given in the Appendix to provide a ready means of calculating the approximate millimetre equivalents of the inch dimensions. More accurate conversions should be based on the tables in BS 350.