1/4-20 STI Socket Head Cap Screw (SHCS)

Size = .250-20 x .875" STI SHCS

T30 Hexalobular Bit (Included)

Head Diameter = .469"

Head Length = .316"

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.