I'm having trouble identifying this type of screw: it has a small hexagonal hole inset 2-3mm inside the barrel. Will a small hex key suffice or do I need something more specific?

(The view from above) View from the side

(The view from the side) View from above

Apologies for the poor quality of my photos! For reference, this is on the camshaft of the motor of a Barnstead Vari-Mix Rocker.

  • Allen key doesn't fit? – ratchet freak Nov 10 '14 at 17:41
  • It's considerably smaller in diameter than the smallest Allen key that I have (1.5mm). I wasn't sure if the cut-out sections protruding from the "nodes" of the hexagon inset required some additional head. – adamgeber Nov 10 '14 at 18:35

Just looks like a hex set screw. An appropriately sized hex key should work.

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