Metric Hexagon Head Set Screws (Fully Threaded) Grade 4.6 Galvanised

When it comes to dependable, general-purpose fastening, the Grade 4.6 Galvanised Hexagon Head Set Screw is an industry staple. Unlike a standard bolt which has a smooth unthreaded section (shank), these set screws are fully threaded from the tip right up to the underside of the head. This design is particularly advantageous in scenarios where you are threading the fastener into a pre-tapped hole or where the grip length needs to be precisely adjusted.

The Grade 4.6 designation refers to the mechanical properties of the steel. In this classification, the 4 indicates a nominal tensile strength of 400 N/mm, while the .6 signifies that the yield strength is 60% of the tensile strength. This makes them a "low-to-medium" carbon steel fastener—perfect for applications where extreme high-tensile strength isn't required, but where flexibility and ease of use are paramount.

One of the standout features of this specific range is the galvanised finish. Galvanisation involves coating the steel in a layer of zinc, which acts as a sacrificial anode.1 Even if the coating is slightly scratched, the zinc will corrode before the underlying steel, significantly extending the service life of the fastener in outdoor or industrial settings. This makes them a preferred choice for fencing, garden structures, and external plant equipment.

The hexagonal head design is engineered for performance. It allows for a positive, non-slip grip when using a wrench or socket, enabling the user to apply the necessary torque to ensure a secure, vibration-resistant hold. Whether you are a professional contractor working on a large-scale project or a DIY enthusiast building a garden deck, these fully threaded set screws provide a professional finish and long-lasting durability.