Here are the nuts and bolts that you'll need to build the basic robot. All of these are metric M-2 sized. 

  * Robotis S1 Bolt (M2x6mm) x16
  * Robotis N1 Nut (M2) x45
  * Robotis S-B Bolt (M3x10mm) x8
  * Robotis N2 Nut (M3) x8
  * Robotis S3 Bolt (M2x10mm) x32
  * Robotis S4 Bolt (M2x12mm) x13
  * Robotis S6 Bolt (M2x20mm) x 4