Flat Socket Head Cap Screws
Flat socket head cap screws—also known as flat head socket cap screws or countersunk socket screws—are designed to sit flush with the surface when installed in a countersunk mounting hole. Their flat head and internal hex drive make them ideal for assemblies where a smooth finish, tight clearances, or clean appearance are required.
Key Benefits
- Flush installation in countersunk holes for a smooth, snag-free surface
- Internal hex (Allen) drive allows controlled installation in tight spaces
- Clean, finished look for visible hardware and exterior-facing parts
- Common choice for machine builds, fixtures, guards, panels, and moving assemblies
Typical Applications
Flat socket head cap screws are widely used in machinery, tooling, die fixtures, automation equipment, enclosures, and automotive components—especially where anything protruding above the surface could interfere with motion, safety, or aesthetics.
Need help matching a standard, material, or finish to your project? Our fastener specialists can recommend the right button head socket screw and help keep your lines supplied through VMI, multi-bin, or kitting programs.