Copyright Goodheart-Willcox Co., Inc. Unit 7 Construction Materials—Types and Uses 121 Descriptive Name Shape Identifying Shape Typical Designation Nominal Size Depth Wt/Ft in Lb. Depth Width Wide e flange shapes e W W21 × × 147 21 × 13 Miscellaneous c sha ap es M M8 × 6.5 8 × 2¼ Ame er ican Standard r beams S S8 × 23 8 × 4 Ame er ican Standard r channels C C6 × × 13 6 × 2 Miscellaneous c cha an nels MC MC8 × × 20 8 × 3 Angles — equal le eg s L L6 × 6 × ½* 6 × 6 Angles — unequa al legs L L8 × 6 × ½* 8 × 6 Struc ct ural tees (cu ut from wide fla fl an ge) WT WT12 × 60 12 Struc ct ural tees (cu ut from miscellaneous l shape es ) MT MT5 × × 4.5 5 Struc ct ural tees (cu ut from Am. S St d d. beams) ST ST9 × × 35 9 Zees s Z Z6 × 1 15 .7 6 × 3½ *Leg thickness Goodheart-Willcox Publisher Figure 7-19. Some examples of structural steel shapes.