Japan
Naval Guns
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The Imperial Japanese Ensign.The Imperial Chrysanthemum Crest.The Japanese Ensign/Flag
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Modern Weapons (1980 to Present)
Japan Ammunition, Guns and Mountings Definitions
5"/62 Mark 45 Mod 4 (USA) Atago (2003) class
127 mm/54 Compact (Italian) Kongô (1990) and Takanami classes
5"/54 Mark 42 (USA) Haruna, Shirane, Takatsuki, Tachikaze and Hatakaze classes
76 mm/62 Compact Murasame, Hatsuyuki, Asagiri, Ishikari, Yûbari and Abukuma classes
20 mm Phalanx (USA) Japanese ships after 1980
20 mm/76 Gatling Japanese Patrol Boats after 1980
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Historical Weapons
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Battleship Main Guns
51 cm/45 Type 98 "Super Yamato" (Design A-150)
36 cm/45 5th Year Type
48 cm/45 5th Year Type
Experimental
40 cm/45 Type 94
(Actual size 46 cm)
Yamato Class
46 cm/45 5th Year Type 13 Class
40 cm/45 Type 90 Experimental
41 cm/45 3rd Year Type
40 cm/45 3rd Year Type
Nagato, Kaga, Amagi and Kii Classes
14"/45 Vickers Mark "A"
14"/45 43rd Year Type
14"/45 41st Year Type
36 cm/45 41st Year Type
Kongô (1912), Ise and Fuso Classes
12.6"/38 Canet
12.6"/38 41st Year Type
32 cm/38 41st Year Type
Itsukushima Class
31 cm/50 Type 0 B-65 Class
12"/50 Armstrong/Vickers
12"/50 41st Year Type
30 cm/50 41st Year Type 
Kawachi Class
12"/45 Armstrong
12"/45 41st Year Type
30 cm/45 41st Year Type 
Katori, Tsukuba, Kurama, Satsuma and Kawachi Classes
12"/40 EOC Patterns
12"/40 41st Year Type
30 cm/40 41st Year Type
Fuji, Shikishima and Mikasa Classes
12"/40 Pattern 1895 (Russia) Iwami (ex-Russian Orel)
12"/30 Pattern 1877 (Russia) Iki (ex-Russian Imperator Nikolai I)
10"/45 Vickers
10"/45 41st Year Type
25 cm/45 41st Year Type
Satsuma and Katori Classes
10"/40 EOC Pattern R
10"/40 41st Year Type
25 cm/40 41st Year Type
Kasuga Class
10"/45 Pattern 1891 (Russia) Mishima and Okinoshima (1905) (ex-Admiral Senyavin and General-Admiral Apraksin)
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Cruiser / Destroyer Main Guns and Battleship / Cruiser Secondary Guns
9"/35 Pattern 1877 (Russia) Iki (ex-Russian Imperator Nikolai I)
20 cm/50 3rd Year Type No. 2 All Japanese Heavy Cruisers after 1940
20 cm/50 3rd Year Type No. 1 Akagi, Kaga, Furutaka, Aoba and Myôkô Classes
8"/45 Pattern 1892 (Russia) Aso (ex-Russian Bayan)
8"/45 EOC Patterns
8"/45 41st Year Type
20 cm/45 41st Year Type 
Armored Cruisers of the early 1900s
20 cm/12 Short Gun Merchant Ships of World War II
15.5 cm/60 3rd Year Type Yamato, Oyodo, Mogami and Tone (1938) Classes
6"/50 Vickers Mark M
6"/50 Mark II and Mark III
15 cm/50 41st Year Type 
Kongô (1912), Fuso and Agano Classes
6"/45 Elswick
6"/45 41st Year Type
15 cm/45 41st Year Type 
Tone (1910) and Chikuma (1910) Classes
6"/45 Pattern 1892 (Russia) Iwami (ex-Russian Oryol)
6"/40 QF EOC Patterns
6"/40 41st Year Type
15 cm/40 41st Year Type 
Pre-dreadnoughts and Armored Cruisers
14 cm/40 11th Year Type Submarines of the 1930s
5.5"/50 3rd Year Type
14 cm/50 3rd Year Type
Battleships and Cruisers 1915 - 1925
5"/54 Mark 16 (USA) Akizuki and Murasame Classes
5"/38 Mark 12 (USA) Yugure Class (ex-USN Fletcher type)
12.7 cm Type 1 or Type 5 Land Mountings
12.7 cm/50 3rd Year Type Most Destroyers built 1930 - 1945
12.7 cm/40 Type 88
12.7 cm/40 Type 89
Type 88:  I.5 and I.6
Type 89:  Battleships, heavy cruisers, aircraft carriers, numerous minor warships and auxiliaries 1930 - 1945
12 cm/45 10th Year Type Akaki, Furutaka, Aoba, Myôkô and Takao Classes
4.7"/45 3rd Year Type
12 cm/45 3rd Year Type
12 cm/45 11th Year Type
Momi, Minekaze, Wakatake, Kamikaze, Mutsuki, Ootori, I153 and I171 Classes
4.7"/40 Elswick
4.7"/40 41st Year Type
12 cm/40 41st Year Type
Tone (1910), Umikaze, Sakura, Urakaze, Kaba, Isokaze, Momo and Enoki Classes
120 mm/45 Pattern 1892 (Russia) Mishima and Okinoshima (1905) (ex-Admiral Senyavin and General-Admiral Apraksin)
12 cm/12 Short Gun Merchant Ships of World War II
4"/40 BL Mark VIII Sakaki
10 cm/65 Type 98 Akitsuki, Oyodo, Taiho and B-64 Classes
10 cm/50 Type 88 I 65 Class (Type KD5)
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Smaller Caliber and Anti-Aircraft Guns
8 cm/60 Type 98 Agano and Ibuki Classes
3"/40 3rd Year Type
8 cm/40 3rd Year Type
8 cm/40 11th Year Type
8 cm/40 Type 88
Furutaka and Aoba Classes
Small ships and submarines 1930 to 1945
3"/40 Elswick Pattern N and Vickers Mark Z
3"/40 41st Year Type
8 cm/40 41st Year Type 
Most warships built around 1900
3"/25 Short Guns
8 cm/25 Short Guns
Small ships and submarines
3"/50RF Yugure Class (ex-USN Fletcher type)
47 mm (3-pdr.) (Russia) Captured ships from Russo-Japanese War
4 cm/60 Type 5 Prototypes
40 mm/62 "HI" Type (Britain) Many ships 1925 to 1935
25 mm/60 AA MG Type 96 Almost all warships of World War II
13 mm/76 AA MG Type 93 Almost all warships of World War II
12 mm/62 "HI" Type A few ships 1925 to 1935
7.7 mm/94 "HI" Type Many ships 1925 to 1935
7.7 mm "RU" Type and Type 92 A few ships 1921 to 1935
6.5 mm 3rd Year Type A few ships 1915 to 1925
12 cm AA Rocket Carriers after 1944
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Updated 13 July 2014