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

(Page 28) End item NSN parts page 28 of 39
Part Number
NSN
NIIN
10-243996-123 Electrical Connector Cover
011567879
10-2472 Toggle Switch
006551575
10-252980-204 Electrical Contact
000786804
10-257937-103 Electrical Connector Cover
009592610
10-257982-162 Electrical Contact
000678663
10-29974 Flat Washer
005319515
10-314980-20P Electrical Contact
011343598
10-314980-20S Electrical Contact
000786804
10-32UNJF,NM IN SERT,CRES 304 Hexagon Self-locking Nut
002089255
10-36675-10S Electronic Shielding Gasket
005799513
10-40450-10S Electronic Shielding Gasket
005799513
10-497006-203 Electrical Contact
001468592
10-497007-203 Electrical Contact
001728253
10-497007-205 Electrical Contact
001728253
10-50724 Flat Washer
001670818
10-597805-355 Electrical Contact
001728253
10-78350 Lug Terminal
001133137
10-90351-22 O-ring
002500230
Page: 28 ...

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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