1 Rivet inserted into clearance hole—tool is engaged. 2 Expander enters sleeve—upset starts to form. 3 Upset continues to form—lock starts to form. 4 Upset complete—lock completely formed. 5 Pin breaks flush, lock visible—installation complete. Lockring (visible after installation) Expander Break neck Gold color = Nominal diameter Silver color = Offset diameter Drive anvil washer Pull grooves Retention splines 4-55 Figure 4-112.  Drive nut blind bolt installation tool. Figure 4-110.  Huck Blind Bolt system. are installed with special tooling. Both powered and hand  tooling is available. During installation, the nut is held  stationary while the core bolt is rotated by the installation  tooling. The rotation of the core bolt draws the sleeve into  Installation procedure:  Use the grip gauge available for the type of fastener and  select the bolt grip after careful determination of the  material thickness. The grip of the bolt is critical for correct  installation.  [Figure 4-112] the installed position and continues to retain the sleeve for  the life of the fastener. The bolt has left hand threads and  driving flats on the threaded end. A break-off relief allows  the driving portion of the bolt to break off when the sleeve is  properly seated. These types of bolts are available in many  different head styles, including protruding head, 100° flush  head, 130° flush head, and hex head. Figure 4-111.  Drive nut blind bolt. 1.  Install the fastener into the hole, and place the  installation tooling over the screw (stem) and nut. 2.  Apply torque to the screw with the installation tool  while keeping the drive nut stationary. The screw  continues to advance through the nut body causing  the sleeve to be drawn up over the tapered nose of  the nut. When the sleeve forms tightly against the  blind side of the structure, the screw fractures in the  break groove. The stem of Jo-bolts, Visu-lok$^{®}$, and  Composi-Lok$^{®}$ II fasteners does not break off flush 