Military zinc plating call-outs usually trace back to QQ-Z-325, the historical specification for electrodeposited zinc coatings. QQ-Z-325 was cancelled and superseded by ASTM B633, so many current prints reference B633 in its place while older drawings still name QQ-Z-325 directly.
Both define the same idea: a controlled zinc thickness with a chromate conversion coating, called out by class and type. We plate to whichever your drawing names.
Who sends us mil-spec work
- Defense and military suppliers plating to a government print.
- Industrial OEMs whose drawings carry a military call-out.
- Machine shops and fabricators building parts for a prime contractor.
Finishes we run for military prints
We plate zinc with yellow, clear, and black chromate to meet a mil-spec call-out. Trivalent chemistry covers RoHS requirements, and we run hexavalent chromate where a drawing specifically requires it. Send the print and we will match the finish to the type it names.
How we plate it
Rack and barrel lines both handle mil-spec work. We set the zinc thickness to the class and apply the chromate the print calls for. A plater watches the work at the tank, parts are inspected by hand, and the order ships kraft wrapped. Typical turnaround is about seven days, with expedite available. We plate under your ISO and quality system so the parts fit your documentation.