Gas-operated, air-cooled machine-gun used on most Italian warships of World War II. Also used on many submarines in a disappearing twin mount. Manufactured by Breda.
| Designation | 13.2 mm/75.7 (0.52") Model 1931 |
|---|---|
| Ship Class Used On | Many |
| Date Of Design | 1931 |
| Date In Service | 1935 |
| Gun Weight | 104.5 lbs. (47.5 kg) |
| Gun Length oa | N/A |
| Bore Length | 39.4 in (1.000 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | N/A |
| Rate Of Fire | 500 rounds per minute cyclic |
| Type | Fixed |
|---|---|
| Weight of Complete Round | 0.28 lbs. (0.125 kg) |
| Projectile Types and Weights | Ball: 1.8 oz (0.051 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A: Complete round 5.4 in (13.7 cm) |
| Propellant Charge | 0.54 oz (154 gm) |
| Muzzle Velocity | 2,592 fps (790 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | 1,500 rounds |
| Elevation | Distance |
|---|---|
| 45 degrees | Maximum: 6,600 yards (6,000 m)
Effective: 2,200 yards (2,000 m) |
| Designation | Single and twin mountings |
|---|---|
| Weight | Single: N/A
Twin: 1,532 lbs. (695 kg) |
| Elevation | Single: -10 / +90 degrees
Twin: -11 / +85 degrees |
| Elevation Rate | Manually operated, only |
| Train | 360 degrees |
| Train Rate | Manually operated, only |
| Gun recoil | N/A |
"The Italian Navigatori Class, 1926" article by Elio Andò in "Warship Special 2: Super Destroyers" edited by Antony Preston
"Naval Weapons of World War Two" by John Campbell
"Italian Warships of World War II" by Aldo Fraccaroli
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Special help from Samuel Yahata
09 May 2006 - Benchmark
26 May 2012 - Updated to latest template
18 May 2021 - Updated to HTML 5 format, added photograph