Flat Head Socket Screw / Countersunk Socket Cap Screw

Flat Head Socket Screw (Countersunk Allen Key CSK Screw)
Flat head socket screws sit completely flush with the surface after installation — no protruding head, no sharp edges, just a clean finish. These black oxide countersunk screws use an internal hex (Allen key) drive, giving you better torque and a tighter fit compared to Phillips or slotted drives.
Our screws are precision-machined from high-strength steel with a black oxide coating for corrosion resistance and a professional look. They engage smoothly, hold firmly, and work across metal, wood, and plastic surfaces.
Key Features:

Flat countersunk head — fully flush installation
Internal hex (Allen key) drive
Black oxide finish — rust resistant
High tensile strength
Metric sizes available

Applications: CNC assemblies, aluminum frames, solar racking systems, electronic enclosures, furniture, automotive components, and woodworking.
Pairs perfectly with our mid clamps, end clamps, and rail splices for solar mounting projects.
Available in bulk — contact us for pricing