9×21mm

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9×21mm
9X21 and 9X19 cartridges.jpg
9×21mm (left) and parent 9x19mm Parabellum (right) cartridges
TypePistol
Place of originIsrael
Production history
DesignerIsrael Military Industries
Specifications
Parent case9×19mm Parabellum
Case typeRimless, straight
Bullet diameter9.03 mm (0.356 in)
Neck diameter9.63 mm (0.379 in)
Base diameter9.93 mm (0.391 in)
Rim diameter9.96 mm (0.392 in)
Rim thickness1.27 mm (0.050 in)
Case length21.15 mm (0.833 in)
Overall length29.75 mm (1.171 in)
Case capacity1.01 cm3 (15.6 gr H2O)
Rifling twist254 mm (1 in 10 in)
Primer typeSmall pistol
Maximum pressure235.00 MPa (34,084 psi)
Ballistic performance
Bullet weight/typeVelocityEnergy
7.45 g (115 gr) FMJ390 m/s (1,300 ft/s)570 J (420 ft·lbf)
8.00 g (123 gr) FMJ360 m/s (1,200 ft/s)518 J (382 ft·lbf)
Source(s): C.I.P.[1]
 
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9×21mm
9X21 and 9X19 cartridges.jpg
9×21mm (left) and parent 9x19mm Parabellum (right) cartridges
TypePistol
Place of originIsrael
Production history
DesignerIsrael Military Industries
Specifications
Parent case9×19mm Parabellum
Case typeRimless, straight
Bullet diameter9.03 mm (0.356 in)
Neck diameter9.63 mm (0.379 in)
Base diameter9.93 mm (0.391 in)
Rim diameter9.96 mm (0.392 in)
Rim thickness1.27 mm (0.050 in)
Case length21.15 mm (0.833 in)
Overall length29.75 mm (1.171 in)
Case capacity1.01 cm3 (15.6 gr H2O)
Rifling twist254 mm (1 in 10 in)
Primer typeSmall pistol
Maximum pressure235.00 MPa (34,084 psi)
Ballistic performance
Bullet weight/typeVelocityEnergy
7.45 g (115 gr) FMJ390 m/s (1,300 ft/s)570 J (420 ft·lbf)
8.00 g (123 gr) FMJ360 m/s (1,200 ft/s)518 J (382 ft·lbf)
Source(s): C.I.P.[1]

The 9×21mm pistol cartridge (also known as the 9×21mm IMI or 9 mm IMI) was designed by Israel Military Industries for those markets where military service cartridges, like the 9×19mm Parabellum, are banned by law for civilian use.

History[edit]

Based on the 9×19mm Parabellum cartridge, the casing was lengthened from 19.05 to 21.15 mm (0.750 to 0.833 in). The bullet sits slightly deeper in the casing, which results in almost the same overall length as the 9×19mm Parabellum cartridge (29.69 to 29.75 mm (1.169 to 1.171 in)).

Notes[edit]

As it is a rimless round, the 9×21mm is used in USPSA/IPSC competition in Open class firearms. The reasoning is that the rimless case will not lock together with other rounds in a double-column magazine, causing a malfunction. Whereas rimmed cases can sometimes lock together in the magazine, causing a jam. As other .38 Super–based .38 Super Auto rimless cases became available, the 9×21mm decreased in popularity in the United States for competition use, but it is still widely used in the rest of the world.

Synonyms[edit]

Cartridge dimensions[edit]

The 9×21mm has 1.01 ml (15.5 grains H2O) cartridge case capacity.

9x21mm.jpg

9×21mm maximum C.I.P. cartridge dimensions.[1] All sizes in millimeters (mm).

The common rifling twist rate for this cartridge is 254 mm (1 in 10 in), 4 grooves, Ø lands = 8.79 mm, Ø grooves = 9.03 mm, land width = 3.80 mm and the primer type is small pistol.

According to the official C.I.P. (Commission Internationale Permanente pour l'épreuve des armes à feu portatives) guidelines, the 9×21mm case can handle up to 235 MPa (34,100 psi) piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.

See also[edit]

References[edit]