Aluminum Alloy Knurled Thumb Screws M3.5 x 4.5~25mm For PC Case Hand Grip Bolts

Check your case manual or measure the existing standoffs with a thread gauge or caliper. M3.5 screws have a 3.5 mm shank diameter. Most ATX cases use M3 or M6 for motherboard standoffs, but M3.5 is common for drive bay covers, side panels, and some OEM chassis. If in doubt, test-fit one screw before ordering a full pack.

For thin sheet-metal side panels (typically 0.8–1.2 mm thick) threading into a captive nut or standoff, the 4.5 mm or 6 mm lengths are usually sufficient. For thicker acrylic panels or stacked materials, 8 mm or 10 mm provides more thread engagement. Measure the panel thickness plus the depth of the receiving thread before selecting.

Yes, for their intended use. Aluminum alloy thumb screws are designed for panel retention loads — they hold covers, grilles, and access panels in place under normal handling. They are not intended for structural or high-vibration applications where steel fasteners with torque specifications are required. For transport, consider supplementing with a locking mechanism if the case will be moved frequently.

Anodizing is an electrochemical process that converts the aluminum surface itself — it is not a coating applied on top. This makes it more durable than paint for typical handling. Under normal use (hand-tightening, occasional removal), the color holds well. Abrasive contact or chemical exposure (e.g., strong solvents) can wear the finish over time.

Yes. These screws are used in any application requiring M3.5 hand-tightenable fasteners: acrylic enclosures for electronics projects, 3D printer access panels, laser cutter covers, rack-mount equipment with frequent access, and maker/prototyping jigs where tool-free disassembly speeds up iteration. Confirm the receiving thread is M3.5 before use.

A standard mid-tower typically uses 2–4 thumb screws per side panel, so 4–8 screws total for both panels. If you are also replacing drive bay cover screws or front panel fasteners, a 10-piece pack covers most builds. The 25-piece pack is suited for full-tower cases or workshop stock where you want spares on hand.

They can, provided the insert is rated for M3.5 threads and the material is thick enough to provide adequate thread engagement (typically at least 3–4 thread pitches). Aluminum thumb screws exert lower torque than steel, which reduces the risk of stripping plastic inserts — but always hand-tighten only and do not force the screw if resistance is felt.