Classes of body armor protection
United States of America
US National Institute of Justice (NIJ)
| Classes | Subclass |
Cartridge (mm) |
Bullet weight (g) |
Initial speed of the bullet (m/s) |
Bullet Type |
| IIA | 1 | 9 mm | 8.0 | 373 (1225 ft/s) |
FMJ RN (Full metal jacket Round Nose) |
| 2 | .40 S&W |
11.7 |
352 (1155 ft/s) |
FMJ (Full metal jacket) |
|
| II | 1 | 9 mm | 8.0 | 398 (1305 ft/s) |
FMJ RN (Full metal jacket Round Nose) |
| 2 | .357 Magnum | 10.2 | 436 (1430 ft/s) | JSP ( jacketed soft point) | |
| IIIA | 1 | .357 SIG | 8.1 | 448 (1470 ft/s) |
FMJ FN (Full metal jacket Flat Nose) |
| 2 | .44 Magnum | 15.6 | 436 (1430 ft/s) |
SJHP (Semi-jacketed hollow point) |
|
| III | 1 | 7.62 mm NATO | 9.6 | 847 (2780 ft/s) |
FMJ (Full metal jacket) |
| IV | 1 | 30 Cal. M2 | 10.8 | 878 (2880 ft/s) |
AP (Armor-piercing) |
