M3×5mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors

For M3 thumb screws, the grip length should generally match or slightly exceed the thickness of the panel or material being fastened. As a rule of thumb, add 1–2 thread pitches of engagement beyond the material thickness. For thin panels (typically 2–4mm), a 5mm (≈3/16") screw provides adequate thread engagement without bottoming out in a blind hole.

Aluminium thumb screws are generally suited for light-duty, hand-tightened applications. They are not intended for high-torque or structural load-bearing use. Typical applications include electronics enclosures, PC cases, camera rigs, and panel access covers where finger-tight clamping force is sufficient. For higher-load applications, stainless steel thumb screws are typically recommended.

Anodised aluminium offers moderate corrosion resistance and is generally suitable for light outdoor or humid-environment use. However, for prolonged exposure to saltwater, harsh chemicals, or standing water, stainless steel fasteners are typically recommended. The anodised coating helps protect the base aluminium from oxidation in most indoor and sheltered outdoor settings.

These are M3 metric thread screws (3mm nominal diameter). They are compatible with M3-threaded inserts, nuts, and tapped holes following the ISO metric standard. They are not compatible with imperial #4-40 or #6-32 threads, which have different diameters and pitches. If you are unsure of your thread standard, measure the hole diameter or check your equipment's documentation.

No. The knurled outer surface is specifically designed for finger-tightening without any tools. This makes them ideal for panels, covers, or components that need to be removed and reinstalled frequently. Avoid using pliers or wrenches, as over-torquing can strip the aluminium threads.

Color choice is typically aesthetic — all 10 anodised colors share the same dimensions and mechanical properties. Black and Silver are popular for electronics and PC builds. Golden and colored options are commonly used for custom builds, cosplay props, and maker projects where a visual accent matters. Color-coding different fastener groups can also help with assembly and maintenance identification.

This listing offers pack sizes of 1, 4, 10, 20, 50, and 100 pieces. For a single panel with 4 fastening points, a 4-pack is generally sufficient. For PC case builds or electronics enclosures with multiple access panels, a 10- or 20-pack is typically recommended. Bulk packs (50–100 pcs) offer better per-unit value for workshop stock or small-batch production use.