Ubiquiti PowerBeam M5 PBE-M5-620 Quick Start Manual page 9

8. Each M8x150 Carriage Bolt includes a serrated flange nut.
Remove these and use them in the next step.
9. Attach one Pole Clamp to each pole bracket.
a. Insert two M8x150 Carriage Bolts into each pole bracket.
b. Slide the hole of a Pole Clamp over one bolt of each
pole bracket.
c. Place one serrated flange nut on each bolt.