14"/45 (35.6 cm) Vickers Mark "A"
14"/45 (35.6 cm) 43rd Year Type
14"/45 (35.6 cm) 41st Year Type
36 cm/45 (14") 41st Year Type
Updated 28 September 2010

This could well be said to be the best battleship gun used by Japan, as it was quite accurate and reliable.  The original design was by the famous British armament firm of Vickers and guns manufactured by that firm were used to arm the battlecruiser Kongô, built at the Vickers-Armstrong yard at Barrow.

Nomenclature for these weapons is somewhat complicated.  The original design was submitted by Vickers to the Japanese in November 1910.  In an effort to hide their true size, Vickers designated these guns on their internal documents as the 12-in Vickers Mark "J" and the Japanese designated them as the 12-in Meiji 43 Type (the 43rd year of the Meiji era being 1910).  Later, the guns built by Vickers were known as the 14-in Vickers Mark "A" and to the Japanese as the 14-in 43rd Year Type.  Guns designed and manufactured by Japan were known as 41st Year Type (Model 1908).  In 1917, when the Japanese converted to metric, all of these guns were then designated as "36 cm" (14.2 inches) but their bores remained unchanged at 14.0 inches (35.6 cm).  For more information on Japanese designations, see Gun Data.

In addition to those guns on Kongô, Vickers supplied a number of complete guns and individual forgings to the Japanese but most guns were built by Kure Arsenal and Japan Steel Works, LTD (Muroran Plant).  A total of about 100 guns from all sources were produced.  There were several versions of the Japanese type, but they and the Vickers guns had similar performance and can be considered together.  The Vickers guns were the customary full-length wire wound type and used cannelured rings at the tube shoulders to reduce "steel choke" problems.  The early 41st Year Type guns were similar, but later ones are believed to have had the inner A tube radially expanded into position.  Vickers "pure couple" breech mechanism was used with a Welin block on all of these guns, similar to British guns of the same era.


IJN Haruna in 1931
Japanese writing at the bottom right of the print is a warning against reproduction.  That at left reads (from right to left):  "Large cruiser battle ship Haruna.  Hiei same type."
U.S. Naval Historical Center Photograph # NH 88378

Click here for additional pictures
Gun Characteristics
Designation Vickers built guns - Vickers designation:  14"/45 (35.6 cm) Vickers Mark "A"
Vickers built guns - Japanese designation:  14"/45 (35.6 cm) 43rd Year Type (Model 1910)

Japanese built guns:  14"/45 (35.6 cm) 41st Year Type (Model 1908)
Japanese built guns:  36 cm/45 (14") 41st Year Type (Model 1908)

Ship Class Used On Kongô, Ise and Fuso Classes
Date Of Design Vickers design submitted to Japan in 1910
Date In Service 1918
Gun Weight 189,586 lbs. (86,000 kg)
Gun Length oa 648.4 in (16.469 m)
Rifling Length
(see Note 1)
540 in (13.737 m)
Grooves (84) 0.12 in deep x 0.349 in (2.048 mm x 8.865 mm)
Lands 0.175 in (4.435 mm)
Twist Uniform RH 1 in 28
Chamber Volume 17,996 in3 (294.9 dm3)
Rate Of Fire 2 rounds per minute

1) Rifling shown as for Model Type II and III barrels.  Model Type III2 and III4 barrels had the same chamber volume, but had a 0.04 in (0.10 cm) shorter chamber and 1.22 in (3.1 cm) less rifling length.

2) US Naval Technical Mission to Japan report O-54(N) states that guns meant to be loaded at high elevations had "ridges around the compression slope, to aid in gripping the projectile rotating bands and prevent the projectile from slipping back after seating."

Type Bag
Projectile Types and Weights
(see Notes 1, 2 and 3)
World War I
   APC Type 3 - N/A, but probably 1,400 lbs. (635 kg)
   Common Type 3 HE - N/A, but probably 1,400 lbs. (635 kg)

   APC Type 5 - N/A, but probably 1,400 lbs. (635 kg)

   APC No. 6 / Type 88 - 1,400 lbs. (635 kg)

World War II
   APC Type 91 - 1,485 lbs. (673.5 kg)
   Common Type 0 HE - 1,378 lbs. (625 kg)
   Common Type 3 IS - 1,371 lbs. (622 kg)

Bursting Charge APC Type 91 - 24.5 lbs. (11.1 kg)
Common Type 0 HE - 65.1 lbs. (29.5 kg)

Others - N/A

Projectile Length APC Type 91 - 60.03 in (152.5 cm)
Common Type 0 HE - 47.25 in (120.0 cm)
Common Type 3 IS - 55.1 in (140 cm)

Others - N/A

Propellant Charge 313.8 lbs. (142.3 kg) 85 DC
Muzzle Velocity APC Type 91 - 2,526 - 2,543 fps (770 - 775 mps)
Common Type 0 HE - 2,641 fps (805 mps)
Common Type 3 IS - 2,641 fps (805 mps)

Others - N/A

Working Pressure 19.0 to 19.2 tons/in2 (3,000 to 3,020 kg/cm2)
Approximate Barrel Life 250 - 280 rounds
Ammunition stowage per gun About 90 rounds

1) Common Type 3 HE shells of the World War I period were developed from shells imported from Britain and were adopted on 26 May 1915.  These should not be confused with the Common Type 3 Incendiary Shrapnel (IS) rounds used during World War II.  The original Type 3 had a shimose filler and had a tendency to detonate on impact, similar to British shells of the era.  It is probable that APC and CPC shells were also imported from Britain at this time but I have been unable to confirm that hypothesis.

2) IS is my abbreviation for the incendiary shrapnel round (sankaidan) intended for AA use.

3) The APC Type 3 was adopted in 1917.  Following World War I, the Japanese obtained some German AP shells and also obtained some British Hadfield AP shells in 1924.  Examination of these examples and the results of their own extensive firing trials resulted in the APC Type 5 which was adopted on 15 June 1925.  This was superseded by the APC No. 6 which was adopted on 17 November 1928.  APC No. 6 was essentially similar to the Type 5 in terms of armor penetration but was better protected from premature detonation and had enhanced underwater performance.  APC No. 6 was redesignated as the Type 88 on 6 April 1931.  On that same date, the improved APC Type 91 was adopted.

4) Type 91 shells were all 6 / [infinity] crh with boat tail and two copper driving bands.  The diameter of the bourrelet was 13.970 in (35.484 cm).  AP Cap, cap head and windshield together weighed 229 lbs. (104 kg).

5) The propellant charge was in four bags.

6) Dye was introduced in 1941 and Type 91 shells containing it were designated as Type 1.  The Kongô class were issued the following dye colors for their Type 1 APC shells:
    Kongô:  Red
    Haruna:  Black
    Kirishima:  Blue
    Hiei:  None

With 1,485 lbs. (673.5 kg) APC
Striking Velocity
Angle of Fall
2.6 degrees
5,470 yards (5,000 m)
2,198 fps (670 mps)
6.1 degrees
10,940 yards (10,000 m)
1,890 fps (576 mps)
9.9 degrees
16,400 yards (15,000 m)
1,673 fps (510 mps)
14.4 degrees
21,870 yards (20,000 m)
1,506 fps (459 mps)
20.0 degrees
27,340 yards (25,000 m)
1,378 fps (420 mps)
28.7 degrees
32,810 yards (30,000 m)
1,358 fps (414 mps)
43.0 degrees
(maximum elevation
of turret)
38,770 yards (35,450 m)
Elevation With 1,378 lbs. (625 kg) HE
Range @ 43.0 degrees 30,650 yards (28,025 m)
Mount / Turret Data
Designation Two-gun Turrets
   Kongô (4), Ise (6) and Fuso (6)
(see Note 5)
Kongô Class:  About 654 tons (664 mt)

Ise and Fuso Classes:  About 688 tons (699 mt)

(see Note 1)
Original:  -5 / +25 degrees
As modified in the 1920s:  -5 / +33 degrees
As rebuilt in the 1930s:  -5 / +43 degrees
Elevation Rate 5 degrees per second
(see Note 2)
Forward and aft turrets:  about -150 / +150 degrees
Amidships turrets:  about 30 to 150 degrees on either side
Train Rate 3 degrees per second
Gun recoil N/A
Loading Angle All except Fuso:  -5 to +20 degrees
Fuso:  +5 degrees

1) Gun elevation was first increased in the 1920s by enlarging the gun port openings.  A later increase in the 1930s was achieved by deepening the gun wells and lowering the revolving structure deeper into the ships.  The Ise and Hyuga lacked sufficient depth in the aftmost two turrets to allow this last change, so only the four forward and amidships turrets were modified for greater elevations.  It should be noted that even the original +25 degree elevation was greater than that of contemporary British designs which were generally limited to +15 or +20 degree elevations.

2) Q turret on the Kongô class was in a more favorable position than those on earlier British battlecruisers, increasing its firing arc to about 60 degrees before the beam and 90 degrees abaft it on either side, although it could not fire directly aft at elevations below about 10 degrees.

3) These mountings used Kenyon Doors to transfer projectiles onto the turret stalks.  Auxiliary electric power was provided, magazines were above the shell rooms in the original British design, although later ships and the modernized Kongôs had this arrangement reversed.  Compressed air runout was added in the 1920s rebuilds.

4) The gun axes were 90 in (229 cm) apart.

5) The weight differences was mainly the result of thicker armor on the battleship turrets.

6) During gunnery practice on 5 May 1942, the left gun breech of Turret #5 on Hyuga suffered a catastrophic failure which killed fifty-one officers and crewmen.  Repaired at Kure over the next few weeks, Turret #5 was removed from the ship and replaced with a circular armor plate atop the barbette.  Four triple 25 mm gun mounts were placed on top of the plate.  Later during 1943, the turrets and barbettes in positions #5 and #6 on Ise and Hyuga were removed when these ships were converted into hybrid seaplane carriers.  See the Naval Technical Board essay The Japanese Ise and Hyuga Hybrid Battleship-Carriers for additional information.

7) The US Naval Technical Mission to Japan report O-47(N)-1 states that "Japanese major caliber turrets (14 and 16-inch) are all of old design and were copied from the British-built turrets for the BB Kongô.  In general arrangement and in most details, they are similar to the British 15-inch turrets, but some improvements have been made by the Japanese . . .[including] Better flash tightness in gunhouses and working chambers.  All battleships were fitted with longitudinal flashtight bulkheads between the guns, and between the gun loading hoists in the working chambers."

Data from
"Naval Weapons of World War Two" by John Campbell
"The Big Gun:  Battleship Main Armament 1860-1945" by Peter Hodges
"Battleships of World War I" by Peter Hore
"Japanese Cruisers of the Pacific War" by Eric Lacroix and Linton Wells II
"Japanese Warships of World War II" by Anthony Watts
US Naval Technical Mission to Japan report O-19:  Japanese Projectiles General Types
US Naval Technical Mission to Japan report O-47(N)-1:  Japanese Naval Guns and Mounts-Article 1, Mounts Under 18"
US Naval Technical Mission to Japan report O-54(N):  Japanese Naval Guns
Combined Fleet TROM for Hyuga (accessed on 19 February 2009)
Special help from Yasufumi Kunimoto (Manager, Japan Steel Works, LTD)
Page History

13 October 2007 - Benchmark
26 February 2009 - Added information regarding turret explosion on Hyuga
28 September 2010 - Corrected typographical error