416 STRUCTURAL DRAFTING. CHAP. XII. 



Order main column material f in. long for milling both ends (this takes care of permissible 

 variation in length of plus or minus f in. as well as the milling). 



Order girder flange angles and plates I in. long. 



Order girder web plates f in. short, where end connections are used. 



Order girder web plates neat length, where end connections are not used. 



Order girder web plates in. less in width than back of flange angles. 



Order stiffener angles j in. long. 



Order fillers under stiffeners neat length. 



Add j^ in. to each lacing bar and order in multiple lengths. 



SHAPES AND PLATES MOST EASILY OBTAINED. The ease with which different 

 commercial sizes of shapes and plates may be obtained from the rolling mill varies with the mill 

 and with the demand. Where any section is in demand rollings are frequent and the orders are 

 promptly filled, while the order for a section not in demand may have to wait a long time until 

 sufficient orders have accumulated to warrant a special rolling. 



The following list of plates and sections is fairly accurate, the list varying from time to time. 



Plates. Plates most easily obtained. 



Width, Thickness, Width, Thickness, 



In. In. In. In. 



i| -fs and | 5 I and up 



if YS and | 6 | and up 



2 and \ 7 i and up 

 2| I and up 8 J and up 

 2? | and up 9 j and up 



3 j and up 10 \ and up 

 3^ I and up 12 J and up 



4 J and up 14 | and up 



Over 14 in. in width it is immaterial what width of plate is specified. 



Squares and Rounds. Squares and rounds most easily obtained. 



Rounds, f", f", 1", i", if, ij". 



Squares, f", f , i", l\" y ij". 



All other sizes are liable to cause delay. 



Beams. Sizes of I-Beams which can be obtained most readily. 



Depth. Weight. 



6" 12! Ib. 



8" 18 Ib. 20 Ib. 



10" 25 Ib. 30 Ib. 



12" 3 iilb. 35 Ib. 40 Ib. 



15" 42 Ib. 50 Ib. 60 Ib. 



1 8" 55 Ib. 60 Ib. 70 Ib. 



20" 65 Ib. 80 Ib. 



24" 80 Ib. 90 Ib. loo Ib. 



Sizes of I-Beams which may be used but for which prompt deliveries may not be expected. 



Depth. Weight. 



5" 9 f Ib. 



7" 15 Ib. 



9" 21 Ib. 25 Ib. 



Beams of weights different from the above can always be obtained from the mills but not so 

 readily as those given. Beams of minimum section can always be obtained more readily than 

 heavier sections. 



