The thickness of 11 gauge steel is approximately 0.1233 inches (3.13 mm) according to several standard gauge charts

. Some sources list it very close to 0.1196 inches (3.04 mm), but the commonly accepted thickness is about 0.123 inches

. In summary:

• 11 gauge steel thickness ≈ 0.1233 inches (3.13 mm)
• Alternative close value: 0.1196 inches (3.04 mm)

This thickness is slightly thinner than 10 gauge steel (about 0.135 inches) and thicker than 12 gauge steel (about 0.109 inches)