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2. Black oxide - Wikipedia

   en.wikipedia.org/wiki/Black_oxide

   Black oxide or blackening is a conversion coating for ferrous materials, stainless steel, copper and copper based alloys, zinc, powdered metals, and silver solder. [1]

3. Bluing (steel) - Wikipedia

   en.wikipedia.org/wiki/Bluing_(steel)

   Black oxide provides minimal protection against corrosion, unless also treated with a water-displacing oil to reduce wetting and galvanic action. In colloquial use, thin coatings of black oxide are often termed "gun bluing", while heavier coatings are termed "black oxide". Both refer to the same chemical process for providing true gun bluing. [1]

4. Talk:USS Iwo Jima (LPH-2) - Wikipedia

   en.wikipedia.org/wiki/Talk:USS_Iwo_Jima_(LPH-2)

   The catastrophic failure was caused by improper fasteners (nuts) installed on the valve. Shipyard workers accidentally installed brass fasteners that had a black oxide finish on them, resembling the hardened steel nuts that should have been used. This type of fasteners cam to be known as BOBCTF's. BLACK OXIDE BRASS COATED THREADED FASTENERS.

5. Sex bolt - Wikipedia

   en.wikipedia.org/wiki/Sex_bolt

   The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface. A sex bolt is normally chosen because of the low profile of its nut compared with that of other nuts. The sex bolt often has a built-in feature, such as a slot, to aid in tightening the fastener.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

7. Phosphate conversion coating - Wikipedia

   en.wikipedia.org/wiki/Phosphate_conversion_coating

   Glock 17 pistol with a black Parkerized topcoat. Glock Ges.m.b.H., an Austrian firearms manufacturer, uses a black Parkerizing process as a topcoat to a Tenifer process to protect the slides of the pistols they manufacture. After applying the Tenifer process, a black Parkerized finish is applied and the slide is protected even if the Parkerized ...