HP StorageWorks IP Storage Router - Manual (Page 30)

Installation
30 IP Storage Router SR2122-2 User Guide
c. Measure the space between the inner edges of the left-front and
right-front mounting uprights to ensure that the space is 17.75 inches
(45.72 cm) wide.
2. Use the rack template provided to mark the center of a 1U mounting location
on both sides of the front and rear mounting uprights.
3. Install cage nuts in the locations marked in step 2.
Figure 7: Installing cage nuts
4. Assemble the rails using the supplied wing nuts (see Figure 8 ).
Note: Do not tighten the wing nuts completely because the rails will need to be
adjusted later in the installation process.