M2x4mm Aluminium Alloy Flat Head Knurled Thumb Screws Bolts For DIY Modification

These screws use a standard M2 metric thread with a 2mm nominal diameter and 0.4mm coarse pitch. This is the most common M2 specification. Before ordering, confirm your tapped hole or threaded insert matches M2 × 0.4mm to ensure a proper fit.

Aluminium alloy thumb screws at M2 size are designed for light-duty, frequently-accessed fastening — think panel covers, battery doors, and access hatches rather than load-bearing joints. For structural connections subject to vibration or significant mechanical stress, a steel fastener with a tool-driven torque is more appropriate.

Anodizing creates an oxide layer that is harder than bare aluminium and provides good resistance to everyday corrosion in dry indoor environments. The finish can scratch under abrasive contact, but for typical workshop and electronics use — where screws are hand-tightened and removed periodically — the anodized color holds up well over repeated cycles.

Yes. M2 × 4mm is a common fastener size for 3D printer electronics covers, acrylic side panels, and lightweight frame brackets. The flat head profile keeps the screw flush with the panel surface, and the knurled grip makes it easy to remove panels for maintenance without reaching for a screwdriver.

Color choice is largely aesthetic, but many builders use a consistent color to mark a specific function — for example, all Black screws for ground-side connections or Golden screws for frequently-removed access panels. All color variants are the same M2 × 4mm specification; only the anodized finish differs.

For a single panel with 2–4 fastener points, the 5-piece pack gives you the screws you need plus a spare. For a full enclosure build or a batch of RC models, the 10-piece pack is more economical per unit. The 1- or 2-piece options are useful when you need an exact replacement for a lost or damaged screw.

Yes, provided the nut or insert is M2 × 0.4mm metric coarse — which is the standard for M2 hardware. Heat-set threaded inserts for 3D-printed parts and standard M2 hex nuts are both compatible. If you are using a non-standard pitch or a UNC/UNF thread, these screws will not fit.