J C Gupta & Sons
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Pin-Hex Button Head Machine Security Screw

As the name states, this has an internal pin within the hexagonal socket which requires a special insert bit or key wrench to insert & remove. This reduces the risk of tampering by thieves or intruders undoing the screws.
Due to its 2-way reusable fixing capability, this is a useful security screw where maintenance is required.

Features:
Unique internal pin system.
Re-usable. Useful for maintenance.
Requires special tools.
Increased security.
Suitable for medium torque applications.
Application: Window grills, light fixtures in trains and buses, electronic equipment, defence equipment, prisons, hospitals, public signs, control panels, security cameras. 

Material: Stainless Steel AISI 304.

Size Range: M3 to M10 up to 80mm length.
Head Styles: Button Head/Truss Head/Dome Head B4K41
For higher torque and clamping force.