Mk-45 5-in./54 Cal Gun Parts

(Page 20) End item NSN parts page 20 of 39
Part Number
NSN
NIIN
07-0994 Hexagon Head Cap Screw
000680509
07.342.4655 Electrical Receptacle Connector
004905220
0701969 Socket Head Cap Screw
009789396
0701982 Socket Head Cap Screw
009835346
0702010 Hexagon Plain Nut
007320559
0702062 Machine Bolt
002264825
0702064 Machine Bolt
002258499
0706385 Lock Washer
001937577
0707278 O-ring
002518839
0708471 O-ring
008052966
071005 Flat Washer
013529593
0711044 Drive Screw
002535607
0713036 Lubrication Fitting
000504203
0714023 Lubrication Fitting
000504203
0714176 Cotter Pin
008392325
0714244 Lug Terminal
005571629
0714250 Incandescent Lamp
001557836
0716-MM5 Pipe Bushing
002783167
0716-MM5-J10 Pipe Bushing
002783167
0716099-022 Electrical Receptacle Connector
002549192
Page: 20 ...

Gun, 5-in./54 Cal, Mk-45

Picture of Mk-45  5-in./54 Cal Gun

1971-present

The 5-inch/54 caliber (Mk 45) lightweight gun is a modern U.S. naval artillery gun mount consisting of a 127 mm (5 in) L54 Mark 19 gun on the Mark 45 mount.

The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied by a six-man crew (gun captain, panel operator, and four ammunition loaders) below deck to keep the gun continuously supplied with ammunition.

Development started in the 1960s as a replacement for the 5-inch/54 caliber Mark 42 gun system with a new, lighter, and easier to maintain gun mounting. In United States Navy use, the Mark 45 is used with either the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System. Since before World War II, 127 mm (5 inches) has been the standard gun caliber for U.S. Naval ships. Its rate of fire is lower than the British 4.5 in (114 mm) gun, but it fires a heavier 127 mm (5-inch) shell which carries a larger burst charge that increases its per-shell effectiveness against aircraft.

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