This nice quality unplated #5-40 flat head screw is made for mounting a rib, or for mounting any Hawken or English triggerguard which lacks a threaded stud, to a triggerplate.
A bit smaller diameter than our #6-40 rib screw, that larger screw can easily be used to replace a worn #5-40 rib screw, when a worn or damaged oversize hole is retapped to #6-40.
We offer gunsmith quality carbon steel plug taps, bottom taps, tap drills, and clearance drills, for easy installation of this screw, at low cost.
