Summary for mil-std 171 plating Discussion
Mil-std 171 in this thread is identified by Ken Vlach as electroplated cadmium per QQ-P-416. He explains that finish 1.1.2.2 is Type II, Class 2, with 0.0003 inch (7.6 microns) thickness and a chromated normal color finish, not bleached or clear. Finish 1.1.3.2 is Type III, Class 2, also 0.0003 inch thick, but phosphated. Ken notes that both call out “See 5.1.3.3,” which he found unclear, and suggests checking the cadmium plater or another expert for that detail. He also points readers to the Defense Department’s ASSIST site for MIL 171 and QQ-P-416F, now superseded by AMSQQP416.
Q. Need to find out what mil-std 171 para 1.1.2.2 or 1.1.3.2 what kind of plating is this.
Thanks,
Kevin Raup
job shop machining – Louisville, Kentucky, USA
2004
A. These MIL 171 finish designations are both electroplated cadmium per QQ-P-416. Finish 1.1.2.2 is Type II, Class 2, 0.0003 inch (7.6 microns) thick, chromated normal color (not bleached or clear). Finish 1.1.3.2 is Type III, Class 2, 0.0003 inch (7.6 microns) thick, phosphated. Both items note “See 5.1.3.3” which is unclear to me. Perhaps your cadmium plater or someone else on this site can explain further. You can download MIL 171 and QQ-P-416F (superseded by AMS AMSQQP416) from the Defense Department’s ASSIST site: https://assist1.daps.dla.mil/quicksearch/
Ken Vlach [deceased]
– Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2004
Ed. note: The ASSIST site moved many times over the years so we are now employing active macros to direct readers to the current specifications.