M3 x 7mm Aluminum Knurled Thumb Screws — Flat Head, Anodized, Hand-Tighten

M3 refers to a 3mm nominal thread diameter (metric), and 7mm is the grip length of the screw shank — approximately 9/32" in imperial. To confirm fit, check that your panel or chassis uses M3-threaded standoffs or inserts. If you are unsure, measure the thread diameter of your existing fastener with a caliper or check your case manufacturer's documentation.

Aluminum thumb screws are generally suited for light-duty panel fastening and cover retention rather than high-torque structural joints. They are typically rated for hand-tightening applications where finger torque is sufficient — such as securing side panels, access covers, and electronics enclosures. For structural or vibration-heavy applications, a steel fastener is generally recommended.

Anodized aluminum generally offers good corrosion resistance for indoor and light outdoor use. The anodized layer provides better moisture resistance than bare aluminum. However, for prolonged exposure to rain, salt spray, or harsh chemicals, a stainless steel fastener is typically a more durable choice. Contact us to confirm suitability for your specific environment.

Yes — M3 is a common thread standard used in PC cases, server chassis, and electronics enclosures. These thumb screws are generally compatible with M3-threaded standoffs and captive nuts found in most ATX, Micro-ATX, and Mini-ITX cases. Always verify the thread pitch of your chassis before ordering, as some manufacturers use non-standard thread specs.

For a single PC side panel, 2–4 screws are typically sufficient. For a full PC build with multiple panels and drive bays, 10–15 pieces is a common starting point. For workshop stock, prototyping labs, or small-batch production, the 20 or 25-piece packs offer better per-unit value. We recommend ordering a small quantity first to verify fit before stocking up.

Standard M3 screws use a 0.5mm thread pitch (coarse). These thumb screws follow the standard M3 metric thread specification. If your application requires a fine-pitch M3 (0.35mm), please contact us to confirm before ordering.

Anodizing is an electrochemical surface treatment that hardens the aluminum oxide layer, improving scratch resistance and corrosion protection. The color is integrated into the surface rather than painted on, so it generally does not peel or chip under normal use. Performance is consistent across all color options.