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AC 43.13-1B 9/8/98 TABLE 7-2. Minimum prevailing torque values for re- used self-locking nuts. FINE THREAD SERIES MINIMUM PREVAILING (3) Iridescent Dichromate. Cadmium- plated work is dipped in a solution of sodium dichromate and takes on a surface film of basic chromium chromate which resists corrosion. Finish is yellow to brown in color. NOTE: Cadmium-plated nuts are re- stricted for use in temperatures not to exceed 450 °F. When used in tem- peratures in excess of 450 °F, the cadmium will diffuse into the base ma- terial causing it to become very brittle and subject to early failure. b. Silver plating. Silver plating is applied to locknuts for use at higher temperatures. Important advantages are its resistance to ex- treme heat (1,400 °F) and its excellent lubri- cating characteristics. Silver resists galling and seizing of mating parts when subjected to heat or heavy pressure. c. Anodizing for Aluminum. An inor- ganic oxide coating is formed on the metal by connecting the metals and anodes in a suitable electrolyte. The coating offers excellent corro- sion resistance and can be dyed in a number of colors. d. Solid Lubricant Coating. Locknuts are also furnished with molybdenum disulfide for lubrication purposes. It provides a clean, dry, permanently-bonded coating to prevent seizing and galling of threads. Molybdenum disulfide is applied to both cadmium and sil- ver-plated parts. Other types of finishes are available, but the finishes described in this chapter are the most widely used. 7-66. CASTLE NUT (AN310). The castle nut is used with drilled shank hex head bolts, clevis bolts, drilled head bolts, or studs that are subjected to tension loads. The nut has slots or castellations cut to accommodate a cotter pin or safety wire as a means of safetying. THREAD SIZE 7/16 - 20 1/2 - 20 9/16 - 18 5/8 -18 3/4 - 16 7/8 - 14 1 - 14 1-1/8 - 12 1-1/4 - 12 TORQUE 8 inch-pounds 10 inch-pounds 13 inch-pounds 18 inch-pounds 27 inch-pounds 40 inch-pounds 55 inch-pounds 73 inch-pounds 94 inch-pounds COARSE THREAD SERIES THREAD SIZE MINIMUM PREVAILING TORQUE 8 inch-pounds 10 inch-pounds 14 inch-pounds 20 inch-pounds 27 inch-pounds 40 inch-pounds 51 inch-pounds 68 inch-pounds 88 inch-pounds a. Cadmium-Plating. This is an electro- lytically deposited silver-gray plating which provides exceptionally good protection against corrosion, particularly in salty atmosphere, but is not recommended in applications where the temperature exceeds 450 °F. The following additional finishes or refinements to the basic cadmium can be applied. (1) Chromic Clear Dip. Cadmium sur- faces are passivated, and cyanide from the plating solution is neutralized. The protective film formed gives a bright, shiny appearance, and resists staining and finger marks. (2) Olive Drab Dichromate. Cadmium- plated work is dipped in a solution of chromic acid, nitric acid, acetic acid, and a dye which produces corrosion resistance. 7/16 1/2 - 9/16 5/8 - 3/4 - 7/8 - 1-8 1-1/8 - 8 1-1/4 - 8 - 14 13 - 12 11 10 9 Page 7-12 Par 7-65PDF Image | AFS-640
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