Construction
The built-up gun is constructed of liner, tube, jacket, three hoops, two locking rings, tube and liner locking ring, yoke ring and screw box liner. Some components were autofretted. Typical of United States naval weapons built in the 1940s, the bore was chromium plated for longer barrel life. It 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.
| 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 (17.35 m) |
| Grooves | (96) 0.150 in deep (3.81 mm) |
| Lands | N/A |
| Twist | Uniform RH 1 in 25 |
| Chamber Volume | 27,000 cu in (0.44 m3) |
| Rate Of Fire | 2 rounds per minute |
| Note: The primer cartridge can be either electric or percussion fired. | |
| Range | 41,622 yards (38.059 km or 20.55 nm) with nominal 660 lb (300 kg) powder charge |
| Muzzle Velocity | 2,690 feet per second (820 m/s) |
Read more about this topic: 16"/50 Caliber Mark 7 Gun
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