Hose fittings are designed and constructed in accordance with military specifications and military standard drawings for particular hose configurations and operating pressures.

Fittings designated by a military standard drawing number have a particular dash number to indicate size. The fitting dash number does not designate a size in the same manner as a hose dash number. The fitting dash number corresponds to the dash number of the hose so that both will match at the critical dimensions to form a hose assembly.

Materials used in the construction of fittings vary according to the application. Materials include aluminum, carbon steel, and corrosion-resistant steel. Fittings that qualify under one military document may be produced by several manufacturers. Two methods or styles are used to secure the hose fitting on to the hose. They are the reusable and swage or crimp style.

The preferred reusable style has modified internal threads in the socket to grip the hose properly. The fitting can be disassembled from a hose assembly and reused on another hose, provided it passes an inspection for defects. Reusable style fittings are authorized replacement fittings for replacement hose assemblies.

Swage or Crimp Style Some hose assembly manufacturers use a swage or crimp style. This style requires the socket to be permanently deformed by an electric- or hydraulic- powered machine. The deformed socket and related com-hardware are to be scrapped.