Aluminum Alloy M5 M6 Colourful Anodised Knurled Thumb Screws Hand Grip Knob Bolt

Measure the total thickness of the panel or material being clamped, then add the minimum thread engagement depth for the receiving nut or threaded insert — typically 1× the thread diameter for aluminum and 1.5× for steel. For M5 into a 3 mm panel with a standard nut, a 5 mm or 8 mm shank is usually sufficient. For thicker panels or deeper threaded holes, select a longer option such as 12 mm, 15 mm, or 20 mm. When in doubt, choose the next size up to ensure full thread engagement.

These screws are machined from aluminum alloy and are designed for hand-tightened, low-torque applications such as panel covers, access doors, and adjustable fixtures. They are not rated for structural or high-vibration load-bearing joints. If your application involves significant mechanical stress or vibration, consider adding a nylon-insert lock nut or thread-locking compound, and evaluate whether a steel fastener is more appropriate for the load.

The hard anodised coating forms an aluminium oxide layer that provides good resistance to surface oxidation and mild abrasion in typical indoor environments. Anodised aluminum performs well in dry or low-humidity conditions. For outdoor or high-moisture environments, the coating offers moderate protection, but prolonged exposure to salt spray or harsh chemicals may eventually degrade the finish. For demanding outdoor use, consider stainless steel alternatives.

Yes. The M5 and M6 threads conform to standard ISO metric thread profiles, making them compatible with standard M5 and M6 hex nuts, nylon-insert lock nuts, wing nuts, and threaded inserts commonly used in aluminum extrusions, sheet metal, and 3D-printed parts. Always verify the thread pitch of your receiving hardware — standard metric coarse pitch for M5 is 0.8 mm and for M6 is 1.0 mm.

Yes, these are a popular choice for 3D printer bed levelling knobs, frame panel covers, and CNC router access guards where tool-free adjustment is needed frequently. The knurled head provides enough grip for hand-tightening against a spring or nut. For bed levelling applications, pair with a spring and standard M5 nut. Confirm the shank length clears your specific frame profile before ordering.

Colour selection is primarily aesthetic or functional for identification purposes. Many builders use a consistent colour per machine or per panel zone — for example, red for power-related covers and black for structural panels. The anodised colours are applied uniformly across the head and shank. Note that colour accuracy may vary slightly between monitor displays; the available options are Red, Pink, Gold Yellow, Dark Blue, Light Blue, Black, Silver, Green, Purple, and Orange.

M5 refers to a 5 mm nominal thread diameter with a standard coarse pitch of 0.8 mm, while M6 has a 6 mm nominal diameter and a standard coarse pitch of 1.0 mm. M5 is more common in compact electronics enclosures and lighter-duty fixtures, while M6 is frequently used in heavier panels, aluminum extrusion frames (such as 2020 and 3030 profiles with M6 T-nuts), and general fabrication. Check the thread size of your existing hardware before selecting.