Hexagonal socket head (Allen key) bolt with full-length thread is used to make connections between structural profiles and accessories. Head screw with an Allen key socket designed for attaching various elements and aluminum profiles. Used for the construction of 3D printers, CNC milling machines, robotics projects, machine guards, workstations, etc. Technical data Thread: M4 Thread length: 8 mm Head diameter: 7.24 - 7.60 mm Head height: 1.95 - 2.20 mm Hexagon socket: 2.5 mm Thread: metric, right hand Material: steel Hardness class: 10.9 Black colour Standard: ISO 7380-1 https://elecena.pl/product/22623216/10-pcs-m4-8mm-allen-head-screw-ball-shaped-head 2023-02-23 https://elecena.pl/product/22623216/10-pcs-m4-8mm-allen-head-screw-ball-shaped-head 2025-10-28