1. a screw used to prevent relative motion between two parts, typically by being tightened against a shaft
Usage: mechanical

Examples

• The collar was secured to the shaft with a setscrew.
• Tighten the setscrew to lock the gear in position.
• The handle came loose because the setscrew had worked itself out.
• Use an Allen wrench to adjust the setscrew.
• The setscrew prevents the pulley from sliding along the shaft.
• Make sure the setscrew is properly seated before tightening.