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Definition of Set screw
1. Noun. A screw with threads the entire length and no head. Typically, setscrews have a hex or slot drive recessed in the threaded length. ¹
2. Noun. Any screw used to hold or adjust a setting. Frequently a setscrew (1), but may also refer to any other machine screw or thumb screw used for the purpose of setting. ¹
¹ Source: wiktionary.com