CHAPTER V.

=FASTENING DEVICES.=

=Bolts=, classification of, from the shapes of their heads 112 Classification of, from the shapes of their bodies 112 Countersunk 112 Holes for, classification of 112 For foundations, various forms of 113 Hook bolts 113 The United States standard for finished bolts and nuts 113 The United States standard for rough bolts and nuts, or black bolts 114 The Whitworth standard for bolts and nuts 114 =Screws= 114 =Studs= 115 =Set Screws= 115 =Bolts= for quick removal 116 That do not pass through the work 117 That self-lock in grooves and are readily removable 117 Heads and their bedding 117 =Nuts=, the forms of, when they are to be steam tight 118 Various forms of 118 Jamb nuts and lock nuts 119 =Differential Threads= for locking purposes 119 For fine adjustments 119 =Nuts=, taking up the wear of 120 Securing devices 120 Securing by taper pins 121 Securing by cotters 121 Securing by notched plates 121 =Pins.= Securing for exact adjustments 121 And double eyes fitting 121 Fixed 122 Working 122 =Bolts=, removing corroded 122 =Nuts=, removing corroded 122 =Washers=, standard sizes of 122 =Wrench=, the proper angles of 123 Box 124 Monkey 125 Adjustable, various forms of 125 Sockets 125 Novel for carriage bolts 125 Pin 126 Improved form of 126 =Keys=, the various kinds of 126 The bearing surfaces of 126 =Set Screws=, application of, to hubs or bosses 127 =Keys=, with set-screws 127 The draught of 127 =Feathers=, and their applications 127 =Keys=, for parallel rods 128 =Taper Pins=, proper position of, for locking purposes 128 Improved method of fitting 128