HP BL20p - ProLiant - G2 Setup And Installation Manual page 44

Installing System Hardware
5. Repeat steps 1 through 3 for the other three hinges.
6. Hang the bus bars on the hinges.
Figure 3-15: Hanging the bus bars on the hinges
7. Insert the hinge nut into the bottom of the top hinge (1).
8. Insert the hinge bolt and use a 4 mm (5/32 inch) Allen wrench to tighten the bolt
into the nut (2).
Figure 3-16: Securing the bus bars to the hinges
3-18 HP ProLiant BL p-Class System Setup and Installation Guide