4O2 



SPECIFICATIONS 



Details. 



Pitch of Rivets. 



Diameter of 

 Punch. 



Net Sections. 



Minimum Sec- 

 tions 



60. Doors are to be furnished as specified and are to be 

 provided with hinges, tracks, locks and bolts. Single doors up 

 to 4 feet and double doors up to 8 feet shall preferably be 

 swung on hinges ; large doors, double and single, shall be ar- 

 ranged to slide on overhead tracks, or may be counterbalanced 

 to lift up between vertical guides. 



Steel doors shall be firmly braced and shall be covered 

 with No. 24 corrugated steel with i}4-inch corrugations. 



The frames of sandwich doors shall be made of two layers 

 of %-in. matched white pirie, placed diagonally, and firmly 

 nailed with clinch nails. The frame shall be covered on each 

 side with a layer of No. 26 corrugated steel with I *4 -inch cor- 

 rugations. 



DETAILS OF CONSTRUCTION. 



61. All connections and details shall be of sufficient 

 strength to develop the full strength of the member. 



62. The pitch of rivets shall not exceed 6 inches, or six- 

 teen times the thickness of the thinnest outside plate in the line 

 of stress, nor forty times the thickness of the thinnest outside 

 plate at right angles to the line of stress. The pitch shall never 

 be less than three diameters of rivet. At the ends of compression 

 members the pitch shall not exceed four diameters of the rivet 

 for a length equal to twice the width of the member. 



63. The distance between the edge of any piece and the 

 center of a rivet hole must never be less than i}4 inches, except 

 in angles having a 2" leg, where it shall be i^g inches. 



64. The diameter of the punch shall not exceed the 

 diameter of the rivet; nor the diameter of the die exceed the 

 diameter of the punch by more than 1-16 inch. 



65. The effective diameter of a driven rivet will be as- 

 sumed the same as its diameter before driving. In deducting 

 the rivet holes to obtain net sections in tension members, the 

 diameter of the rivet-holes will be assumed as y$ inch larger 

 than the undriven rivet. 



66. No metal of less thickness than % inch shall be 

 used except for fillers ; and no angles less than 2" x 2" x J4". 

 No upset rod shall be less than ^ inch in diameter. Sag rods 

 may be as small as 





