In the south-east corner of the huge room where you have to fight the boss, a door is locked. Use your Trespasser to open it and access a crank bolt. Once activated, a blast door will open, giving you access to the gold bolt located accross a lava pool.
In the warbot production line, where you have to fight the boss, a button can be found in a small room on the western side. Activate it to disable the forcefield protecting the gold bolt located inside the center column of the factory.
In the very last room of Clank's segment (where you need to use 3 bots to power up some generators), a gold bolt can be seen behind a grate directly to your left when you enter the area. To access it, you need to retrieve the 3 bots, use one to jump onto the platform located near the bolt, another one to create a bridge leading to the grate and a final one to jump to reach it. You will also need to get a bomb from the previous room to destroy the grate.