Commonly referred to as a setscrew or simply as a bolt. The fully threaded ISO 4017 or DIN 933 should not be confused with it's DIN 931 equivalent. A standard spanner or ratchet is typically used to fit this product. Used for decades on all types of assembly throughout the world. As with the DIN 931 hex bolt, the hex drive allows a higher torque to be applied. These screws are Hexagon headed and are fully threaded (unlike Hex Bolts which are only part threaded) thus they afford the user a higher degree of adjustment and a little more flexibility in assembly.