ST4.2×25 screw — a compact, precision fastener built for tight spaces and dependable performance across electronics, hobby projects, and light-duty assemblies.

Size at a glance: ST4.2×25 denotes a 4.2 mm diameter with a 25 mm length. This slender profile enables secure mounting in slim panels, electronic enclosures, and multi-layer brackets without adding bulk to the build.

Why this size matters

• Slim 4.2 mm diameter minimizes intrusion in delicate assemblies and narrow mounting holes.
• 25 mm length provides enough bite to secure multiple layers or brackets while keeping the exterior clean and flush.
• Versatile for a range of light-duty applications—from electronics housings to small mechanical fixtures.

Ideal use cases

• Mounting covers, panels, and brackets inside tight electronic enclosures.
• Installing sensors, small motors, or components in compact hobbyist or DIY robotics projects.
• Securing lightweight chassis elements in 3D-printed or thin-walled assemblies where space is at a premium.

Practical tips for best results

• Pre-drill pilot holes appropriate to the material to prevent cracking in plastics or distortion in thin metals.
• Use with washers when distributing load or when mounting larger brackets to avoid pull-through.
• Pair with a compatible driver bit to reduce cam-out and achieve a clean, flush seating.