The American infantry used an anti-take weapon that was the 37-mm Anti-Tank gun. Later, they adopted a 57-mm AT gun. These were light weapons which could be pulled by infantrymen. Each Infantry Regiment of an Infantry Division had one Anti-Tank Company and one Cannon Company, which could be used for direct support. However, they were primarily used as a defense in case infantry had to fall back.
Each Infantry Regiment had one Field Artillery Battalion for direct fire support which fired the 105mm Howitzer.

The M26 Pershing tank had armor 102 mm thick on the front of the hull, and 76 mm thick on the sides of the hull. The turret was protected by 102 mm of armor (the same as the hull), while the mantlet (gun shield) for the 90 mm main gun was up to 114 mm thick. The M26 Pershing was one of the only Allied tanks during WWII with thick enough armor to take a direct hit from the German 8.8 cm anti-tank gun and survive.

if you mean the javelin anti tank gun then yes

Contrary to popular belief the German 8.8cm gun was not the biggest gun mounted on a tank in WW2. the bigest gun mounted on a tank that saw combat was the D25-T 122 mm gun on the Russian JS-1. the biggest gun mounted on a none conventional tank that saw combat is the 380 mm Rocket propelled naval gun off the StrumTiger of witch only 7 were ever built.

57 mm = 2.244 inches.

Direct Conversion Formula 57 mm*

1 in

25.4 mm

=

2.244094488 in