Will a .223 Remington Penetrate Steel A36?

Yes — defeats a 6 mm steel a36 barrier
Penetration depth
13 mm (0.5″)
Impact velocity
990 m/s (3248 fps)
Muzzle energy
1764 J (1301 ft-lb)
Bullet behaviour
Intact

Fired at the muzzle, a representative .223 Remington load (3.6 g, FMJ, 990 m/s) reaches roughly 13 mm (0.5 inches) into steel a36. That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.

About Steel A36

Mild structural steel plate (~6 mm); car bodies are far thinner (~1 mm).

.223 Remington against other materials

MaterialDepth (mm)Depth (in)
Red Brick176 mm6.9″
Concrete171 mm6.7″
Tempered Glass26 mm1.0″
Steel AR5008 mm0.3″
Aluminum 606124 mm0.9″
See exactly what .223 Remington does to Steel A36 — open in the calculator →

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