Nuts and Bolts
This type of bolt has a small head that allows it to fit/locks into the wood slightly allowing it to be a tight fit.
Two spaners are needed to tighten these. One on the bolt and one on the nut. (With nuts and bolts you only ever tighten the nut)
Nuts and bolts 2
The Machine screw is held in place whilst the wing nut is tightened. The wing nut is the easiest nut to tighten.
SECTIONS - SOLIDS AND TUBES