M3 Knurled Thumb Screws — 5-Pack | Aluminum + Stainless Steel | 4mm to 100mm

Measure the thickness of the material you're fastening, then add the required thread engagement depth. For example, if your panel is 3mm (≈1/8") thick and the threaded hole is 6mm deep, a 10mm screw is typically a good starting point. Available lengths run from 4mm (≈5/32") to 100mm (≈3.94"), so most panel and enclosure applications are covered. When in doubt, size up — you can always use a washer to take up extra length.

These are generally designed for light-duty, hand-tightened applications — panel covers, access doors, RC body shells, and electronics enclosures. Stainless steel variants typically offer higher tensile strength than aluminum. For applications requiring significant clamping force or structural load, a tool-tightened fastener is generally more appropriate.

The stainless steel construction generally provides good resistance to moisture and light corrosion, making these suitable for occasional outdoor use. Anodized aluminum variants add a surface layer that helps resist oxidation. For prolonged saltwater exposure or chemical environments, contact us to confirm suitability for your specific application.

These use the standard M3 metric thread (3mm nominal diameter, typically 0.5mm pitch per ISO 68-1). They are compatible with M3 threaded holes, brass heat-set inserts, and M3 hex nuts commonly used in electronics enclosures, 3D printer frames, RC vehicles, and general fabrication. If your project uses a non-standard thread pitch, contact us before ordering.

No tool is required. The knurled head is specifically designed for finger-tightening, which is the main advantage of thumb screws over standard socket or Phillips head fasteners. This makes them well-suited for panels and covers that need to be opened and closed regularly during maintenance or adjustment.

The colored aluminum variants are generally anodized, meaning the color is integrated into the surface layer of the metal rather than applied on top. Anodizing is in most cases more durable than paint and resists chipping under normal handling. The Silver variant is typically the natural stainless steel finish with no additional coating. Contact us to confirm the specific finish for a particular color if durability is critical to your application.

Each order includes 5 screws of your selected size and color. Single-piece orders are not available in this listing. If you need a larger quantity or a custom pack size, contact us and we can discuss options.