Supermicro SuperChassis 512L-260B (Black) CSE-512L-260-B User Manual

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 SC512 Chassis User’s Guide

3. Attach the front (-short)  bracket to the  front end of the  rack, and secure it to the 
rack with  two  Type H  screws and Type I  washers as shown below.

4. Attach the rear (-long)  bracket to the  rear  end of the  rack, and secure it to the  
rack with  two  Type H  screws and Type I  washers as shown below. Repeat the 
same steps to install the other outer rail to the other side of rack.