Hobson S500 CL4 Flanged Hex Self-Drilling Screw: 12-24 x 50 - 100pk

The Hobson Series 500 Flanged Hex Self-Drilling Screw is engineered for heavy-duty metal-to-metal fixing where standard self-drillers won't cut it. The extended drill point combined with a fine 24 TPI thread cuts cleanly through metal up to 12mm thick — including thick steel purlins and hot rolled steel — without the need for pre-drilling, saving you time and eliminating an entire step from the process.

The flanged hexagon head distributes load evenly across the fixing surface for a secure, rattle-free hold, while the Class 4 corrosion-resistant coating meets AS3566.2 — the Australian standard for corrosion performance — making it equally at home on exposed exterior structures as it is in industrial and commercial applications.

When the steel is thick and the job has to hold, this is the screw you reach for.

Key specifications:

• Brand: Hobson
• Range: Series 500
• Size: 12-24 x 50mm
• Material: C1022 hardened steel
• Finish: Class 4 corrosion-resistant coating — compliant with AS3566.2
• Head type: Flanged hexagon
• Thread: 24 TPI fine thread
• Drill capacity: Self-drilling in metal up to 12mm thickness
• No pre-drilling required
• Pack quantity: 100 screws
• Applications: Metal-to-metal fixing, thick steel purlins, hot rolled steel