Use your STI threaded holes for fixturing immediately, no rework or custom screws
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⭐ Most popular first purchase
In stock - ships same day!
Not sure what size you need? This pack covers everything.
Size = 4-40 x .450" STI SHCS
Head Diameter = .227"
Head Length = .140"
T10 Hexalobular Bit (Included)
PreCoil Socket Head Cap Screwsare purpose-built forSTI (Screw Thread Insert) tapped holes— the oversized internal threads you cutbefore installing a Heli-Coil.
Instead of running standard threads, only to later blow-out to STI sized, or even worse, installing Heli-coils to fixture a part, and then have to remove them before plating; PreCoil fasteners let youfixture, clamp, and assembledirectly into STI-tapped holes with confidence.
Oversized external threads. Tight tolerances. No guessing. Perfect for test fits, fixture builds, and any application where pre-insert threading can be utilized.
