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General part number decipher

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Jan B:
Already trying all evening to find a post where part number code's for general parts are explained. How can one tell if a hex bolt is chromed or zinc plated from the part number?
General part numbers have this format:
xxxxx-xxxxx-yy

I am interested in the YY designation. I've seen 4J, OA, OB, O2, O7 etc. I am assuming that OB means chromed. Is that correct? And does this also apply on nuts and washers?

Cheers.

Oddjob:
Each of those codes stand for something like chrome, black, bzp, etc. There may be a list of what stands for what but not sure I’ve ever seen one.

AshimotoK0:
As far as I know 0A is zinc plated, 0B is chrome painted , 4J is stainless steel (SS is rare on old Hondas  but  such things as the CB750K0 gauge clamp and exhaust heatshield retainers are stainless. e.g. 93500-05020-4J

There is also a -01 and -02 extension on spoke set part numbers .. some spoke nipples  are  nickel plated brass  (CB450K0 bomber, CB92 etc) and most are  carbon steel with zinc or nickel/zinc plating.
 
Different nomenclature on frame parts -XW is chrome, -B is black painted etc.

Oddjob:
07 seems to be black with captive spring and flat washer.

Jan B:
Thanks guys, that helps a lot.
Regarding the spoke nipples i know that early CB750K2 had zinc plated and yellow passivate whilst later ones were blue passivated.

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