Aluminium Alloy Knurled Thumb Screws M4x8/10/12mm Hand Grip Knob Bolts Colourful

Select the length based on the combined thickness of the material being clamped plus the thread engagement depth in your nut or insert. As a general guide: 8 mm suits thin panels (typically 1–3 mm material with a standard M4 nut); 10 mm works for medium stacks; 12 mm accommodates thicker panels or deeper inserts. Measure your stack before ordering.

Yes. The knurled cylindrical head is designed to provide sufficient friction between fingertips and the screw head for firm, repeatable hand tightening. They are not intended for high-torque structural joints — they are optimised for access panels, covers, and enclosures that are opened and closed regularly.

The anodised aluminium alloy finish provides a degree of oxidation resistance suitable for indoor and light-duty environments. For prolonged outdoor exposure or high-humidity conditions, consider applying a compatible sealant or contact us to confirm suitability for your specific application.

These screws are compatible with any standard M4 threaded hole, including tapped aluminium, acrylic, and ABS panels, as well as M4 brass or steel threaded inserts and standard M4 hex nuts. Ensure the tapped depth or nut thickness matches your chosen screw length for full thread engagement.

Colour choice is typically functional or aesthetic. Many builders use distinct colours to identify different fastener zones on a jig or enclosure (e.g., Red for power-related panels, Black for structural covers). Alternatively, match the screw colour to your enclosure anodising or chassis finish for a clean visual result.

Yes. M4 knurled thumb screws are widely used in RC car battery covers, drone frame access panels, and electronics project enclosures where tool-free access is needed during tuning, maintenance, or battery swaps. Verify that your frame or enclosure uses M4 thread before ordering.

Each variant is a specific combination of length, colour, and quantity. To order multiple colours, add each colour variant separately to your cart. There is no mixed-colour pack option — this ensures you receive exactly the colours and quantities needed for your build.