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

End item NSN parts page 1 of 39
Part Number
NSN
NIIN
0-011 O-ring
001660975
0-0205090-1 Electrical Contact
002393338
0-1285 O-ring
005793158
0-1512 O-ring
001660980
0-18751NINSTBALL Bearing Ball
001006149
0-1892 O-ring
005433041
0-55 O-ring
012443527
0.1900-32UNJF,N MINSERT,CRES304 Hexagon Self-locking Nut
002089255
0.375UNF Hexagon Self-locking Nut
009500039
00.4.341.0779 Lug Terminal
005571629
000-1232-2000 Lubrication Fitting
001720034
000-1350-9900 Breather
007738022
000-44859 Machine Bolt
002264827
000-60-8017-03-1 Electrical Contact
000796624
000-60-8017-03-13 Electrical Contact
000796624
000-60-8017-0313 Electrical Contact
000796624
000-8002-371 Pipe To Tube Straight Adapter
008377073
000-8006-101 Electrical Compone Tiedown Strap
001563253
0000060-019 Incandescent Lamp
001557836
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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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