ISO 4017 is the primary international standard for hexagon head screws with Full Threading. As a critical component of the ISO metric fastener system, it specifies the characteristics of screws from M1.6 up to M64, ensuring seamless global compatibility and precision engineering.

Unlike partially threaded bolts, ISO 4017 screws feature threads that run the entire length of the shank to the head. This makes them ideal for fastening into pre-tapped holes or for applications requiring maximum thread engagement in compact assemblies.

ISO 4017 is designed for clamping versatility. Because the screw is threaded to the head, it eliminates the risk of "bottoming out" against an unthreaded shank, allowing for secure tightening even in thin materials or shallow tapped holes. This standard categorizes screws into Product Grade A (up to M24 and lengths ≤ 10d or 150mm) and Product Grade B (larger sizes/lengths) to define dimensional tolerances.