Definitions Used

Aust = Made in Aust
NOS = New Old Stock = comes as purchased = shop soiled and /or greasy and/or covered in wax, found in a warehouse.
U = used, second hand.
UK = Made in United Kingdom

Thread types
BA = British Association thread
BSCy = British Standard Cycle thread
BSF = British Standard Fine thread
CEI = Cycle Engineers Institute ( earlier name for BSCy thread, Contains more thread sizes than BSCy.) Despite popular opinion this is NON Whitworth form thread.
Metric = Metric thread
Whit = Whitworth thread
UNC = Unified Coarse - NOT compatible with Whitworth
UNF = Unified Fine

Copyright © 2017 BMH Trading Classic Motorcycle Parts