19. When bolts and nuts are used as connectors, thread specifications will be given in a note. If a thread
specification note indicated 1/2-13NC-2, which of the following would be a correct statement? (para 2-19, a)
a. nominal size of major diameter is 2 inches
b. thread series is National Fine
c. bolt has 26 threads per inch
d. bolt has a right-hand thread
20. Shop drawings show the details of the fabrication of parts and methods of assembly for the structural members
prepared in special fabricating shops. Shop drawings are made about light working lines laid out first along the
centerlines, or rivet gage lines, to form a skeleton of the assembled members. All dimensions are given using
the intersection of these lines as reference points. How are the points of intersection referred to? (para 2-20, a
(1))
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