How deep does a 5.56 NATO penetrate Tempered Glass?

At the muzzle, a representative 5.56 NATO load penetrates approximately 29 mm (1.1 inches) into tempered glass.

What is the impact energy of a 5.56 NATO?

This 5.56 NATO load carries about 1693 joules (1249 ft-lb) at the muzzle.

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Will a 5.56 NATO Penetrate Tempered Glass?

Yes — defeats a 6 mm tempered glass barrier

Penetration depth

29 mm (1.1″)

Impact velocity

920 m/s (3018 fps)

Muzzle energy

1693 J (1249 ft-lb)

Bullet behaviour

Intact

Fired at the muzzle, a representative 5.56 NATO load (4 g, FMJ, 920 m/s) reaches roughly 29 mm (1.1 inches) into tempered glass. That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.

About Tempered Glass

Tempered and automotive glass runs about 6 mm thick.

5.56 NATO against other materials

Material	Depth (mm)	Depth (in)
Red Brick	193 mm	7.6″
Concrete	175 mm	6.9″
Steel A36	14 mm	0.6″
Steel AR500	8 mm	0.3″
Aluminum 6061	26 mm	1.0″

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Will a 5.56 NATO Penetrate Tempered Glass?

About Tempered Glass

5.56 NATO against other materials

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