MIL-STD-171 Finishing Of Metal And Wood SurfacesThis standard establishes and updates general finish codes and serves as a general guide to the selection of suitable materials, procedures, and system for cleaning, plating, painting and otherwise finishing of metal and wood surfaces.

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MIL-STD-171F

TABLE II. Inorganic finishes, metallic coatings. (Continued) Finish No. Requirements

1.2.3 Discontinued: Data to be specified on drawing or in contract

1.2.4 Black, MIL-DTL-14538

1.2.5 Porous chromium plating, MIL-C-20218

* 1.3 Lead coatings

* 1.3.1 Electrodeposited lead, MIL-L-13808, type I, without preliminary copper coatings

1.3.1.1 Class 1, 0.001 inch (25 μm) thick

1.3.1.2 Class 2, 0.0005 inch (13 μm) thick

1.3.1.3 Class 3, 0.00025 inch (6.4 μm) thick

1.3.1.4 0.0015 inch (38 μm) thick

* 1.3.2 Electrodeposited lead, MIL-L-13808, type II, or ASTM B200 with preliminary copper plating 0.000015 inch (0.38 μm) thick

1.3.2.1 Class 1, 0.001 inch (25 μm) thick

1.3.2.2 Class 2, 0.0005 inch (13 μm) thick

1.3.2.3 Class 3, 0.00025 inch (6.4 μm) thick

1.3.2.4 0.0015 inch (38 μm) thick

*	1.3.3	Hot dip lead coating, ASTM A308/A308M
	1.3.3.1	Type I (low tin content, 93.5% Lead, minimum, 5.0% Tin, minimum, 1.0%
		Other elements, maximum), salt spray exposure time 48 hours
	1.3.3.2	Type II (medium tin content, 89.0% Lead, minimum, 6.5 - 8.5% Tin, 1.5%
		Bismuth, maximum, 1.0% Other elements, maximum), salt spray exposure
		time 96 hours
	1.3.3.3	Type III (high tin content, 67.0% Lead, minimum, 30.0% Tin, minimum,
		1.0% Antimony, maximum, 1.0% Other elements, maximum), salt spray
		exposure time 72 hours
*	1.4	Nickel coatings
*	1.4.1	Decorative plating, AMS 2403; bright or dull finish as specified
	1.4.1.1	Grade C, 0.0010 inch (25 μm) thick
	1.4.1.2	Grade E, 0.0006 inch (15 μm) thick
	1.4.1.3	Grade F, 0.0004 inch (10 μm) thick
	1.4.1.4	Grade G, 0.0002 inch (5 μm) thick
	1.4.1.5	Use finish 1.4.1.2 (grade E)
	1.4.1.6	Use finish 1.4.1.3 (grade F)
	1.4.1.7	Use finish 1.4.1.4 (grade G)
	1.4.1.8	Use finish 1.4.1.2 (grade E)
	1.4.1.9	Use finish 1.4.1.3 (grade F)
	1.4.1.10	Use finish 1.4.1.3 (grade F)
	1.4.1.11	Grade A, 0.0016 inch (40 μm) thick
	1.4.1.12	Grade B, 0.0012 inch (30 μm) thick
	1.4.1.13	Grade D, 0.0008 inch (20 μm) thick
	1.4.2	Engineering plating, AMS 2423, thickness as specified.
*	1.4.3	Electroless nickel coating, ASTM B733
	1.4.3.1	Class 1, as deposited, no heat treatment
	1.4.3.2	Class 2, heat treatment at 260 to 400OC (500 - 752 OF) to produce
		minimum hardness of 850 HK100

*General finish requirement headings shall not be specified. The specific finish numbers(s) only

shall be specified. See page iii for the proper method of specifying finishes