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What is MIL-STD-171 or


Q. I do the purchasing and quoting for a small job shop and am trying to find out what or of MIL-STD-171 is. I would greatly appreciate any help.

Greg T [last name deleted for privacy by Editor]
Job Shop - Houston, Texas


A. Greg, you can find Military Specifications on the web pretty easily- currently^ works, but if the DoD changes it just type in "Military Specification" in Google, and you'll get there. Anyway, in Revision E, paragraph deals with Chemical Agent Resistant Coatings (CARC), and there is no Perhaps your request refers to an earlier revision of Mil-Std-171.

lee gearhart
Lee Gearhart

Ed. note: The Assist site has moved many times over the years, so we are now using active macros to link directly to the specs in question, as below ...


A. Mil-STD-171 [link is to free spec at Defense Logistics Agency,] E concerns Phosphate finishes for iron & low alloy steels. is Phosphate Type M per DOD-P-16232 [ed. note: replaced by MIL-DTL-16232 [link is to free spec at Defense Logistics Agency,]].

Class 2, is with a supplementary treatment with lubricating oil conforming to MIL-L-3150 [ed. note: superceded by Mil-PRF-3150 [link is to free spec at Defense Logistics Agency,]], and is Phosphate Type Z per DOD-P-16232 Class 2 with preservative conforming to MIL-PRF-16173 [link is to free spec at Defense Logistics Agency /] , grade 3 or MIL-L-3150 (as alternate for very small parts) Hope this helps.

Marie M [last name deleted for privacy by Editor]
- Santa Fe Springs, California, USA

April 3, 2008

A. Marie M's answer is the correct one! Mil STD 171 is the standard for industry to coat bare metals to a certain specification for the Department of Defense. MIL-STD-193 is the standard for CARC.

William Dewberry

July 27, 2010

A., and are all heavy manganese phosphate coating designations found in MIL-STD-171

Dennis Johnson
- Marion, Iowa, USA

November 3, 2010

A. Sorry, I was lost as Lee was, because this spec has a section, but that's not not what you are talking about . . . you are talking about finish number and, from Table V


Although phosphated parts that are not oiled usually get painted, I don't see this specification demanding that they be painted.


Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


Q. I am working on a dwg. and need help, it calls out the following spec, I will type exactly as I see it called out.
Protective Finish:

Finish OR
Plus 30.7 TYPE 111 OF MIL-STD-171, .0002-.0003 THICK


Thank you,

Daniel White
- Appleton, Wisconsin

November 2, 2010


Thinking difference is .2 for oiling parts and .3 for not oiled parts to be painted?

Matt DuVall
- Bloomington, Minnesota, USA
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