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4-40 STI Socket Head Cap Screw (SHCS)
4-40 STI Socket Head Cap Screw (SHCS)
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 Screws are purpose-built for STI (Screw Thread Insert) tapped holes — the oversized internal threads you cut before 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 you fixture, clamp, and assemble directly 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.
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Great product, great service!
These work flawless right out of the bag. Thank you so much
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