7×20mm Nambu
TypePistol
Place of originJapan
Service history
In service1903–1945
Used byJapan
Production history
Designed1902
ManufacturerType B Nambu Pistol 1. Tokyo Artillery Arsenal, Koishigawa, Tokyo 1903–1923 and 2. Tokyo Gas and Electric Co., Ltd., Tokyo 1923–1929. Was ammunition made in the same factories?
No. builtPistols - Possibly less than 6,500. 1. Tokyo c. 5,900 and 2. TGE c. 550. Number of 7×20mm rounds made is unknown but today they are a quite rare collector's item occasionally found in WW2 boxes of 50 rounds.
VariantsAt least 5, including a dummy. Variations mainly occur in type of bullet crimping, jacket type and rim thickness.
Specifications
Case typeBottleneck rimless Bullet diameter7.08 mm (0.279 in)
Neck diameter7.64 mm (0.301 in)
Shoulder diameter8.62 mm (0.339 in)
Base diameter8.91 mm (0.351 in)
Rim diameter9.11 mm (0.359 in)
Rim thickness0.98 mm (0.039 in)
Case length19.80 mm (0.780 in)
Overall length26.80 mm (1.055 in)
Primer typeSmall pistol
Ballistic performance
Bullet mass/type Velocity Energy56 gr (4 g) FMJ 240 m/s (790 ft/s) 108 J (80 ft⋅lbf)
Bullet mass/type Velocity Energy
56 gr (4 g) FMJ · 240 m/s (790 ft/s) · 108 J (80 ft⋅lbf)
Test barrel length: 83 mm (3.25 in)