MILITARY PLATING SPECIFICATIONS PROCESS MIL. SPEC ...

1 MILITARY PLATING SPECIFICATIONSPROCESS MIL. SPEC. THICKNESS COMMENTSCHROME QQC-320bExcellent hardness(Rc 68-74) Type .. BrightWear resistance, and erosion Type .. Has low coefficient Class .. Decorative PLATING . (usually overOf friction, and is resistant to copper and nickel undercoats.) Heat.

2 In addition to above Class as specified on Engineering PLATING . Properties, can be rendered on drawing. Pourous for lubrication bake at 375 deg +/- 25 deg Class .. Plated to specified dimensions orF for 3 hrs or as specified. Processed to specified Dimensions after peening and post baking Class.

3 Parts below Rockwell C40 andNot required. And subject to static loads or Designed for limited life under Dynamic peen per MIL-S-13165 Class .. Parts below Rockwell C40 and Designed for unlimited life under Dynamic bake at 375 deg +/- 25 deg Class.

4 Parts have hardness of RockwellF for 3 hrs. C40 or above and subject to static Loads or designed for limited life Under dynamic loadsShot peen before PLATING . Class.

5 Parts have hardness of RockwellPost bake at 375 deg +/- 25 deg C40 or above and are designed F for 3 hrs. for unlimited life under dynamic NICKEL Mil-C-26074 BSimilar to stainless steel in color. Class Unless otherwise As coatedPlates uniformly in recesses and Class Steel, copper, nickel, and cobaltCavities (does not build up on base alloys.)

6 Heat treated afterEdges. resistance is good for Class .. Aluminum alloys other thanCoatings over .001 thickness. Alloy 7075. Heat treated after nickel is used extens- Grade .001 .. Minimum thickness. For iron andIvely in salvage of mis-machined aluminum based Also, for inside dimensions Grade.

7 0005 .. Minimum thickness. For copper, And irregular shapes (where assy nickel, and cobalt based need uniformity pro-Vided by electroless PROCESS .)NICKEL QQ-N-290 AClass 1 PLATING is used to pro- Class .. Corrosion protective iron, copper, or zinc Steel, Zinc & Copper andAlloys against corrosive attack. Zinc alloys.

8 Copper alloysUsed as undercoat for chromiumOr precious metals; or for d cor- Grade .0016 .. SD, and M ..Ative. Grade .0012 .. SD, and M SB, and MForms of nickel deposition: Grade .0010 .. M SB,SD, and MSB-Single layer coating. Fully Grade .0008 .. SB, SD & M1 SD & MBright finish: SD-single layer in Grade .0006 .. SB, SD, & M1 SB, SD, & M1A dull or semi bright finish.

9 Grade .0004 .. SB, SD, & M1 SB, SD, & M1(Contains less than .005 % sulfer) Grade .0002 .. SB, SD, & M1M-Multi-layer coating. See 2 PLATING . Resistance and Note: 1; SD or M may be sub-Abrasion resistance: for build up Class .. stituted for SB in mild or mod-Of worn or undersized parts: pro- Nickel plated to erate service against corrosive spec thickness.

10 Engineering PlatingChemical environments. Type of nickel PROCESS should be Called out. For salvage and great Hardness & corrosion QQ-P-416-FBright silvery white.