16-50 Mark 7

Missing image
16-50_Mark_VII_gun_barrel.JPG
Yard workers hoist one of nine 16"/50 Mark VII gun barrles aboard the USS Iowa during her construction in 1942

The 16"/50 Mark 7 - United States Naval Gun was originally intended to fire the relatively light 2,240 pound (1,016 kg) Mark 5 armor piercing shell, the shell handling system for these guns was redesigned to use the "super-heavy" 2,700 pound (1,225 kg) APC Mark 8 before any of the USS Iowa class battleships were laid down. This heavier projectile made these guns nearly the equal in terms of penetration power to the 460 mm (18.1 in) guns of the Japanese Yamato class battleships yet they weighed less than three-quarters as much.

The weapon is constructed of liner, A tube, jacket, three hoops, two locking rings, tube and liner locking ring, yoke ring and screw box liner. Some components were autofretted. As typical of United States naval weapons built in the 1940s, the bore was chromium plated for longer barrel life. Uses a Welin breech block that opens downwards and is hydraulically operated. The screw box liner and breech plug are segmented with stepped screw threads arranged in fifteen sectors of 24 degrees each.

Gun Characteristics

Designation 16 in/50 caliber (406 mm × 20.3 m) Mark 7
Ship Class Used On Iowa (BB-61) and Montana (BB-67) Classes
Date Of Design 1939
Date In Service 1943
Gun Weight 267,904 lb (121,519 kg) (including breech)
239,156 lb (108,479 kg) (without breech)
Gun Length oa 816 in (20.73 m) (breech face to muzzle)
Bore Length 800 in (20.32 m)
Rifling Length 682.9 in (17.34 m)
Grooves (96) 0.150 in deep (3.81 mm)
Lands N/A
Twist Uniform RH 1 in 25
Chamber Volume 27,000 in3 (0.44 m3)
Rate Of Fire 2 rounds per minute
Note:  The primer cartridge can be either electric or percussion fired.

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