In a W 18 x 50 beam, the 'W' denotes which attribute?

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Multiple Choice

In a W 18 x 50 beam, the 'W' denotes which attribute?

Explanation:
Shape designations identify the shape family used. The first letter in a wide shape like W is telling you the type of structural shape, specifically a wide-flange (I-beam) shape. The numbers that follow describe size: the depth is about 18 inches and the weight is about 50 pounds per foot. The letter isn’t indicating weight or width, and “wrought” isn’t part of this designation. So the attribute represented by the first letter is the shape type—wide-flange.

Shape designations identify the shape family used. The first letter in a wide shape like W is telling you the type of structural shape, specifically a wide-flange (I-beam) shape. The numbers that follow describe size: the depth is about 18 inches and the weight is about 50 pounds per foot. The letter isn’t indicating weight or width, and “wrought” isn’t part of this designation. So the attribute represented by the first letter is the shape type—wide-flange.

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