Rivets 



Riveting 



Field Rivets 



Turned Bolts 



Eye Bars 



Boring 

 Eye Bars 



Pin Holes 



Pilot Nuts 



Pins and 

 Rollers 



Forging 

 Pins 

 Screw 

 Threads 



Bearing 



Surfaces 



Planed 



17 



157. The size of rivets called for on the plans shall be understood as their nominal 

 diameter before heating. 



158. Rivet heads, when not countersunk or flattened, shall be of approved shape 

 and of uniform size for the same diameter of rivet. Rivet heads shall be full, neatly 

 made, concentric with the rivet holes, and in full contact with the surface of the member. 



159. Rivets shall be heated uniformly to a light cherry red and driven while hot. 

 Rivets, when heated and ready for driving, shall be free from slag, scale and carbon 

 deposit. When driven they shall completely fill the holes. Loose, burned or otherwise 

 defective rivets shall be replaced. In removing rivets, care shall be taken not to in- 

 jure the adjacent metal, and, if necessary, they shall be drilled out. Caulking or re- 

 cupping will not be permitted. 



160. Rivets shall be driven by pressure riveters where practicable. The riveters 

 shall retain the pressure after the upsetting is completed. 



161. Field rivets shall be furnished in excess of the nominal number required, to 

 the amount of 15 per cent, plus 5 rivets, for each size and length. 



162. Field rivets shall be carefully selected and shall be free from fins on the under 

 sides of the head. 



163. Where turned bolts are used to transmit shear, the holes shall be reamed paral- 

 lel and the bolts shall make a tight fit, with the threads entirely outside of the holes. 

 A washer not less than 1/4 inch thick shall be used under each nut. 



164. Eye bars shall be straight and true to size, and shall be free from twists, folds 

 in the neck or head, or any other defect. Heads shall be made by upsetting, rolling or 

 forging. Welds will not be allowed. The form of the heads may be determined by the 

 dies in use at the works where the eye bars are to be made, if satisfactory to the Engineer; 

 but the Manufacturer shall guarantee the bars to break in the body when tested to rup- 

 ture. The thickness of head and neck shall not vary more than 1/16 inch from that 

 specified. 



165. Before boring, each eye bar shall be properly annealed and carefully straight- 

 ened. Pin holes shall be on the centre line of the eye bar and in the centre of the heads. 

 Bars of the same length shall be bored so accurately that, when placed together, pins 

 which are 1/32 inch smaller in diameter than the pin holes can be passed through the 

 holes at both ends of the bars, at the same time and without forcing. 



166. Pin holes shall be bored true to gauge, smooth and straight, at right angles to 

 the axis of the member, and parallel to each other, unless otherwise called for. Boring 

 shall be done only after the member has been riveted up. 



167. The distance centre to centre of pin holes shall be correct within 1/32 inch: 

 the diameter of the holes shall be not more than 1/50 inch larger than that of the pin, 

 for pins up to 5 inches in diameter; and 1/32 inch for larger pins. 



168. Pilot and driving nuts shall be furnished for each size of pin. 



169. Pins and rollers shall be accurately turned to gauge; they shall be straight and 

 smooth and entirely free from flaws. 



170. Pins larger than 7 inches in diameter shall be forged and annealed. 



171. Screw threads shall make a tight fit in the nuts; when over 1% inches in dia- 

 meter they shall be made with 6 threads per inch. 



172. The top and the bottom surfaces of shoe and cap plates of columns and bed 

 plates, except surfaces in contact with masonry, shall be planed, or hot-straightened, and 

 parts of members in contact with them shall be faced to fit. Connection angles for base 

 plates and cap plates shall be riveted to compression members before the members are 

 faced. 



