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

(Page 11) End item NSN parts page 11 of 39
Part Number
NSN
NIIN
0206494 Annular Ball Bearing
005543232
0206494-7 Annular Ball Bearing
005543232
021-4-4 Pipe To Tube Straight Adapter
008377073
021.450536 Flat Washer
007737624
021.450629 O-ring
002483843
0210-0032 Machine Screw
000546656
02101392 Hexagon Head Cap Screw
000680509
0211267 Pneumatic Tank Valve
005356483
021183-0001 Electrolytic Fixed Capacitor
004950042
021243-0002 Electrolytic Fixed Capacitor
004950042
0215-7377 O-ring
005797911
0218-0806 Flat Washer
008805976
0219-7377 O-ring
005797925
02195-1201-32 O-ring
007025643
02195-1301-37 O-ring
008337491
022-C-69 O-ring
002500230
02250 Flat Washer
001670823
02251 Flat Washer
001670821
022525-005-70 O-ring
005840266
02261-0808 Hexagon Self-locking Nut
004780259
Page: 11 ...

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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