buttonhead bolt

См. также в других словарях:

• buttonhead — I. ˈ ̷ ̷ ̷ ̷| ̷ ̷ adjective of a bolt, rivet, or screw : having a head with a spherical exposed surface and plane shoulder, the height of the head being usually less than a hemisphere II. noun : a buttonhead bolt, screw, or rivet see rivet… …   Useful english dictionary