Summary for mil-std-171 1.9.2.3 Discussion
MIL-STD-171 1.9.2.3 is identified in the thread as electrodeposited zinc per ASTM B633, Type II, with a supplementary chromate treatment and a normal color that is not bleached or clear. The specific subparagraph 1.9.2.3 is described as Class 3 with a thickness of 0.0002 inch (5.1 µm). Lisa Meyer asked what the clause meant, and the reply points her to the wording previously shared by Chris Jurey. The answer also notes that the standard is currently at a referenced location, but no further interpretation or alternate reading is offered in the excerpt.
Q. I’m trying to find out what 1.9.2.3 of MIL-STD-171 is?
lisa Meyer
– WATERBURY
May 21, 2025
A. Hi Lisa,
Sorry for the delay in posting your question, but maybe in the meanwhile you’ve read on down the page to where Chris Jurey gave us this:
1.9.2.3 Class 3, 0.0002 inch (5.1 um) thick
“
That standard is currently at https://quicksearch.dla.mil/qsDocDetails.aspx?ident_number=35549,
and Table II on page 13 describes the finishes. Here’s a screen capture:
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
⇩ Similar, related, Q&As — oldest first ⇩
Q. I’m trying to find out what 1.1.2.3 or 1.9.2.3 of MIL-STD-171 is?
Marvin Elliott
Cost estimator – Pompano, Florida
November 6, 2008
A. Go to the assist quicksearch website at https://assist.daps.dla.mil/quicksearch/ ⇩
You should find the spec there. I think the latest revision is revision E.
Brian Terry
Aerospace – Yeovil, Somerset, UK
Ed. note: That site seems to move every year or two. The current location (May 2025) is https://quicksearch.dla.mil/, and the current version is F.
A. TABLE II. Inorganic finishes, metallic coatings.
+
1.1 Cadmium coatings
1.1.2 Plating, w-P-416, type II, with supplementary chromate treatment; normal color: not bleached or clear (see 5.1.3.3)
1.1.2.3 Class 3, 0.0002 inch (5.1 um) thick
1.9 Zinc coatings
1.9.2 Electrodeposited zinc, ASTM B633, type II with supplementary chromate treatment; normal color: not bleached or clear (see 5.1.3.3)
1.9.2.3 Class 3, 0.0002 inch (5.1 um) thick
Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
Wadsworth, Ohio
Q. Good morning ,
I wonder if anyone knows what protective finish 7.3.1 of MIL 171 is?
Materials are alum. alloy 5052 H32 .090 thk.
Thanks for your advise in advance!
Rebecca Randazzo
Owner and operator – Kingston, New York, USA
January 26, 2012
A. Hi, Rebecca.
I’m not sure that I understood the question, but Finish No. 7.3.1 is “Chemical film, chromate, MIL-DTL-5541
[⇦ this spec on DLA] or ASTM B449
Type II, Class 1A, for maximum protection against corrosion, painted or unpainted”.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.