set screw
noun1
Any screw used to hold or adjust a setting, via fixation in a certain location or position: frequently a headless one, but may also be any other machine screw or thumb screw used for the purpose of setting.
- ...upon which the sheet to be reduced in width is placed and held firm by set screws, the part to be cut off falls upon the sinkage....1847, editorial staff, “Machine for punching copper sheets”, in Scientific American, series 1, Volume 3, Issue 9, page 73:
2
A headless screw with threads along the entire length. Typically, such screws have a hex or slot drive recessed in the threaded length.
3
New Zealand A screw with a head, usually hexagonal, like a bolt but without a shank to allow it to screw into material rather than take a nut; a tap bolt.