This USED ST4x12 hexagon-socket screw combines a flat round head with a self-tapping tip for fast, secure installations. The hex drive lets you snug it down with a standard Allen wrench, giving you precise control and a clean, low-profile finish on every project.

Key details

• Size: 4 mm diameter (ST4), 12 mm length
• Drive: hexagon socket
• Head style: flat round head
• Tip: self-tapping for quick, self-starting installation
• Condition: used, inspected for function; surface wear may be present

Why this screw stands out

• Effortless assembly—the self-tapping tip reduces the need for pre-drilling in soft metals and plastics, speeding up repairs and builds.
• Secure, flush finish—the flat round head provides a neat, low-profile appearance while delivering a solid bearing surface.
• Cost-effective option—as a used component, it offers dependable performance at a lower price point without sacrificing reliability.

Ideal use cases

• Electronics enclosures, control panels, and lightweight metal chassis
• Thin metal sheets and DIY furniture assemblies where a compact fastener matters
• Repairs or retrofits in workshops and garages requiring a common ST4x12 size

How to get the best results

• For metals and hard plastics, ensure a proper pilot hole if recommended for your material
• Avoid overtightening to prevent thread deformation or head damage—tighten to a snug, secure fit
• Match with compatible tools (Allen key or driver) for maximum torque control and longevity

Whether you’re stocking up for ongoing repairs, tackling a one-off project, or assembling components where a clean, professional look matters, this USED ST4x12 hex socket screw delivers dependable performance. Add it to your toolkit and you’ll have a ready, economical fastener that’s proven to work in a variety of common applications.