#6-32 Knurled Thumb Screws — Aluminum Alloy, 7 Lengths, 10 Colors, Hand Grip Knob Bolts

Measure the total thickness of the material you're fastening, then allow 2–3 thread diameters of engagement beyond the material for a secure hold. For example, a 5mm (≈3/16") screw suits thin PC case panels with standard standoffs, while a 16mm (≈5/8") or 20mm (≈25/32") screw is better for thicker enclosure walls or stacked panel assemblies. Available lengths: 5mm, 5.5mm, 6mm, 10mm, 12mm, 16mm, and 20mm — choose the shortest length that still provides full thread engagement in your mating hole.

These aluminum alloy thumb screws are designed for hand-tightened, tool-free applications where moderate panel retention force is needed — not for high-torque structural joints. For standard PC case panels, access covers, electronics enclosures, and DIY fixtures, aluminum thumb screws generally provide sufficient clamping force for secure retention through repeated use. For higher-load applications, a stainless steel thumb screw is typically recommended.

These screws are made from aluminum alloy, which is naturally corrosion-resistant for typical indoor use. They are not specifically rated for outdoor, marine, or high-humidity environments. For demanding outdoor or damp applications, a stainless steel thumb screw is generally the more suitable choice. These are optimized for indoor electronics, PC enclosures, and workshop fixtures.

These screws use the #6-32 UNC (Unified National Coarse) thread standard — the most common inch-series thread size used in US-standard PC cases, server chassis, and electronics enclosures. They are compatible with any standard #6-32 threaded standoff, tapped hole, or nut. Always verify the thread specification of your mating component before ordering to ensure compatibility.

All three are short lengths suited for thin panel fastening. The 5mm (≈3/16") and 5.5mm (≈7/32") are the most common for standard ATX PC case side panels and expansion slot covers. The 6mm (≈1/4") provides slightly more thread engagement and is generally used when the standoff depth or panel thickness is marginally greater. If in doubt, measure your standoff depth and choose the closest match.

Longer lengths are typically used for thicker enclosure walls, stacked panels, or applications where the screw must pass through a spacer or bracket before engaging the threaded hole. A 10mm (≈3/8") or 12mm (≈15/32") screw suits medium-thickness panels, while 16mm (≈5/8") and 20mm (≈25/32") are used for thicker assemblies or when additional grip length is needed for hand tightening in workshop jigs and DIY fixtures.

No. The color finish is anodized or coated and is purely aesthetic — it does not affect thread dimensions, shank length, or mechanical performance. All color variants share the same #6-32 UNC thread and the same dimensions within each size option. Color-coding is a practical way to organize panels, differentiate fastener locations, or match your build's color scheme.