In the designation 1210 for a shear, what does the first number represent?

• A. Length in Feet
• B. Material Type
• C. Die Width
• D. Thickness in Gauge

Answer: (D)

In sheet metal tool designations, the first digit shows the cutting thickness in gauge—the maximum material thickness the shear is designed to handle. Gauge is a standard thickness scale used for metal: lower numbers mean thicker metal, higher numbers mean thinner metal. So a first digit of 12 means the machine can reliably cut up to 12-gauge material (and thinner materials as well). The second digit refers to another dimension of the machine, but the question is asking about the first digit, which is the thickness in gauge.