Ho-401 cannon

{{Infobox weapon

|name=Ho-401 cannon

| image=

| image_size = 300

|caption=

|origin = Imperial Japanese army

|type= Aircraft cannon

|is_ranged=yes

|is_bladed=

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|is_artillery=

|is_vehicle=

|is_UK=yes

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|wars=World War II

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|weight={{convert|150|kg|lb|abbr=on}}

|length={{convert|2000|mm|in|abbr=on}}

|part_length={{convert|800|mm|in|abbr=on}}

|width=

|height=

|crew=

|cartridge=57 x 121R (1,550 g)

|caliber={{convert|57|mm|in|abbr=on}}

|action=Short recoil-operated

|rate=80 rounds/min

|velocity={{convert|495|m/s|abbr=on}}

|range=

|max_range=

|feed= 16-round drum

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}}

Ho-401 was a Japanese aircraft autocannon that saw limited, if any, use during World War II. It was a large-caliber version of the 37 mm Ho-203 cannon. The cannon was used on the ground-attack, Kawasaki Ki-102b heavy fighter of the Imperial Japanese Army Air Force.Gustin & Williams, p. 183