Socket Screws

Socket screws - also known as socket cap screws or Allen screws - are the precision engineering fasteners with a cylindrical head and a hexagonal socket recess, driven by an Allen key or hex bit. At the DIY Hardware Store, our socket screws range covers the socket cap head and button head formats in the metric sizes used across mechanical engineering, machinery assembly, and structural fabrication applications where high clamping force and precise torque control are required.

The hex socket drive is the engineer's preferred fastener drive because it allows high torque to be applied in deeply recessed or confined locations where spanner access is impossible, the Allen key engages the full depth of the socket for positive torque transfer without cam-out, and the fastener head can be machined to tight dimensional tolerances for precision assembly applications. Socket cap screws in grades 8.8 and 12.9 are specified for high-tensile structural connections in machinery and engineering.

Available in zinc-plated steel and stainless steel (A2 and A4 grades) at the DIY Hardware Store in metric sizes from M3 to M12.

  • Hex socket (Allen key) drive for high torque in confined spaces
  • No cam-out - positive drive engagement to full socket depth
  • Cylindrical cap head for precision engineering applications
  • High-tensile grades for structural machinery connections
  • Zinc-plated and stainless steel A2/A4 options
  • Metric sizes M3 to M12 available