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

(Page 30) End item NSN parts page 30 of 39
Part Number
NSN
NIIN
1000-34 O-ring
005798108
100001 Machine Bolt
000680513
100004-35 Annular Ball Bearing
001091179
1000069 Electrolytic Fixed Capacitor
012706124
10001 Electrolytic Fixed Capacitor
004950042
1000120270 O-ring
010463300
100019-3 Machine Screw
000546666
100024-200 Lock Washer
001937577
100024-9 Machine Screw
000546656
1000460-P19 Lubrication Fitting
000504203
100061-009 Pipe Bushing
002783167
1001-1012-215A Pipe To Tube Straight Adapter
008377073
10010-473 Film Fixed Resistor
011707740
1001116 Pipe Bushing
002026491
100123 Lubrication Fitting
000504208
10013221 O-ring
001675117
1001414 Lubrication Fitting
001720034
10015524-002 Lug Terminal
001133137
10015524-021 Lug Terminal
001141300
10015524-022 Lug Terminal
000506215
Page: 30 ...

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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