JM61 (20 mm)

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Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.

The 20 mm JM61 is a Japanese naval cannon. It is a version of the 20 mm JM61A1 rotary aircraft cannon equipped on Japanese jet fighters.

Vehicles equipped with this weapon

General info

The JM61 has the second-highest rate of fire of any naval weapon, at a whopping 3,000 rounds per minute (RPM). As such, the JM61 can shred through any boat with ease and even dissect larger ships. There is also a modification available to lower the rate of fire to 450 RPM, but the decrease in effectiveness is not worth the extra time of continuous fire.

Available ammunition

Describe the shells that are available for the weapon and their features and purpose. If it concerns autocannons or machine guns, write about different ammo belts and what is inside (which types of shells).

The JM61 has a choice of 3 belts: HEI, API-T, and APDS.

  • 20 mm HEI belts: HEF-I · API-T · HEF-I · HEF-I · API-T · HEF-I
  • API-T: API-T · HEF-I · API-T · API-T · API-T · HEF-I
  • 20 mm APDS belts: APDS · APDS · APDS · APDS
Penetration statistics
Shell Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
API-T 53 50 41 34 29 25
HEI 60 57 50 43 38 34
APDS 45 42 31 25 21 18
Shell details
Ammunition Velocity
Mass (kg)
Fuse delay
Fuse sensitivity
Explosive Mass
(TNT equivalent) (g)
0% 50% 100%
API-T 1030 0.15 N/A N/A N/A 47° 60° 65°
HEF-I 1030 0.1 0 0.1 10 79° 80° 81°
APDS 1113 0.1 N/A N/A N/A 75° 78° 80°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

  • AK-230 - 30 mm CIWS cannon found on the Pr. 206, has a third the rate of fire, but each turret has 2 barrels, meaning that the Pr. 206 effectively fires 4,000 RPM
  • 30 mm/54 AK-630 - 30 mm CIWS cannon mounted on the MPK Pr.12412, has an even higher rate of fire than the JM61 at 5,000 RPM, but no access to any armour-piercing rounds

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.


  • Very high rate of fire
  • API-T and APDS belts can cut through most ships it meets


  • Overheats quickly, continuous fire is not recommended


Examine the history of the creation and combat usage of the weapon in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the weapon and adding a block "/ History" (example: and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.


An excellent addition to the article would be a video guide, as well as screenshots from the game and photos.

See also

External links

Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • other literature.

Japan naval cannons
20 mm  JM61 · Type 98
25 mm  25 mm/60 Type 96
37 mm  Type 4 · Type 11 pattern 1922
40 mm  40 mm/62 Vickers
57 mm  Type 97
75 mm  Type 88 AA
76 mm  3-inch/40 Type 41 · 8 cm/40 3rd Year Type · 8 cm/60 Type 98
100 mm  100/65 mm Type 98 mod A
120 mm  120 mm/45 3rd Year Type · 120 mm/45 10th year type
127 mm  5 inch/40 Type 89 · 127 mm/50 3rd Year Type
140 mm  140 mm/50 3rd Year Type
152 mm  6-inch/45 Type 41 · 15 cm/50 Type 41
155 mm  155 mm/60 3rd Year Type
200 mm  20 cm 3rd year type No.1
203 mm  20 cm/50 3rd year type No.2
356 mm  36 cm/45 Type 41
40 mm  Bofors L/60 Mark 1 (USA) · Bofors L/60 Mark 2 (USA) · Bofors L/60 Mark 3 (USA)
76 mm  3 inch Mk.33 (USA) · 3-inch Mk.34 (USA)
120 mm  4,7-inch/40 Armstrong (Britain)
127 mm  5 inch/38 Mk.12 (USA)
305 mm  12-inch/45 Vickers (Britain) · 12-inch/50 Vickers (Britain)