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2. Black oxide - Wikipedia

   en.wikipedia.org/wiki/Black_oxide

   Like hot black oxide, mid-temperature black oxide converts the surface of the metal to magnetite (Fe 3 O 4). However, mid-temperature black oxide blackens at a temperature of 90–120 °C (194–248 °F), [6] significantly less than hot black oxide. This is advantageous because it is below the solution's boiling point, meaning there are no ...

3. Carriage bolt - Wikipedia

   en.wikipedia.org/wiki/Carriage_bolt

   A carriage bolt (also called coach bolt and round-head square-neck bolt) [1] is a type of bolt. It is also known as a cup head bolt in Australia and New Zealand. It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt ...

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed. confirmat screw: confirmat screw: Used in particleboard and medium-density fiberboard: elevator bolt: An elevator bolt is a similar to a carriage bolt, except the head (or foot, depending on the application) is thin and flat.

5. 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.

6. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Carriage bolt - Bolt with a smooth rounded head and a square section to prevent turning followed with a threaded section for a nut. Elevator bolt - Bolt with a large flat head used in conveyor system setups. Hanger bolt - Bolt that has no head, machine threaded body followed by a wood threaded screw tip.

7. Pilot shares heartfelt commitment to passengers' safety after ...

   www.aol.com/pilot-shares-heartfelt-commitment...

   Sixty-seven people are dead after a regional jet collided with an Army Black Hawk helicopter Wednesday night over Washington, D.C., officials said, the nation's first major commercial airline ...