MIL-STD-186 Protective Finishing For Army Missile Weapon SystemsThis standard establishes the minimum requirements for procedures, materials, and systems for cleaning, plating, painting and finishing metals, wood, electronic materials, parts and assemblies for rockets, guided missiles, and components to protect them from deterioration.

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Code

No.

Coating

Type

Other Treatment

Thickness, minimum (inch)

312

313

314

315

316

317

318

319

320

321

322

Same

Cadmium plate, vacuum deposited,

(SAE AMS-C-

8837) Same

Same Same Same Same

Type I, Class 3

Type II, Class 1

Type II, Class 2

Type II, Class 3

Type III, Class 1

Type III, Class 2

Type III, Class 3

No supplementary treatment.

Chromate supplementary treatment.

Chromate supplementary treatment.

Chromate supplementary treatment.

Phosphate supplementary treatment.

Phosphate supplementary treatment.

Phosphate supplementary treatment.

0.0002

0.0005

0.0003

0.0002

0.0005

0.0003

0.0002

0.00001

0.001

Chromium plate (SAE-AMS-QQ-C-320   Type I, Class 1)  (Usually applied over copper and nickel undercoats or applied directly to the less corrosion-resistant grades of stainless steel)

Chromium plate (SAE-AMS-QQ- C-320)

Use Code 380

Black chromium plate  (MIL-

DTL-14538)

Type II, Class 2