4-inch/40-caliber gun

The 4"/40 caliber gun (spoken "four-inch-forty-caliber") was used for the secondary batteries on the United States Navy's battleship Iowa, Columbia-class protected cruisers, and the armored cruiser New York, and was the primary batteries on the gunboats Nashville, Wilmington, and Helena.

4"/40 caliber Marks 1, 2, 3, 4, 5, and 6
Photograph of USS Iowa, 4-inch gun and gunner.
Type
Place of originUnited States
Service history
In service1897—1945
Used byUnited States Navy
Wars
  • Spanish–American War
  • Philippine–American War
  • Boxer Rebellion
  • World War I
  • Siberian Intervention
  • World War II
Production history
DesignerBureau of Ordnance
Manufacturer
No. built
  • Mark 1: 4 (Nos. 1–3, 6)
  • Mark 2: 2 (Nos. 4–5)
  • Mark 3: 69 (Nos. 7–69, 71, 73, 74, 82, 87)
  • Mark 4: 45 (Nos. 108–117, 180–209, 255
  • Mark 5: 23 (Nos. 70, 72, 75–81, 83, 85, 86, 88–98)
  • Mark 6: 119 (Nos. 99–107, 118–179, 210–212, 256, 283–312, 339–352)
VariantsMarks 1 – 6
Specifications
Mass
  • Mark 1: 3,388 lb (1,537 kg) (without breech)
  • Mark 2: 3,398 lb (1,541 kg) (without breech)
  • Mark 4: 3,160 lb (1,430 kg) (with breech)
  • Mark 5: 3,100 lb (1,400 kg) (with breech)
  • Mark 6: 3,529 lb (1,601 kg) (with breech)
Length
  • Marks 1–3, 6: 164 in (4.2 m)
  • Marks 4–5: 166.25 in (4.22 m)
Barrel length
  • Marks 1 and 3: 160 in (4.1 m) bore (40 calibers)
  • Marks 2: 157.5 in (4.00 m) bore (39 calibers)
  • Marks 4–6: 164 in (4.2 m) bore (41 calibers)
Shell33 lb (15 kg) armor-piercing
Caliber4 in (102 mm)
Elevation-15° to +20°
Traverse−150° to +150°
Rate of fire8 – 9 round per minute
Muzzle velocity2,000 ft/s (610 m/s)
Effective firing range11,500 yd (10,500 m) at 31.2° elevation
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