6-32 UNC Flat Knurled Thumb Screws — Anodized Aluminum, 10 Colors, 5.5mm to 20mm

Measure the total thickness of the material you're fastening, then allow 2–3 thread diameters of engagement beyond the material. For example, if your panel stack is about 10mm (≈3/8") thick, the 16mm (≈5/8") length is generally a good fit. The 5.5mm (≈7/32") option suits very thin panels or PCB standoff applications, while the 20mm (≈13/16") works for thicker assemblies. When in doubt, size up — you can always add a washer to take up extra thread.

These are anodized aluminum thumb screws intended for light-duty, hand-tightened applications such as electronics enclosures, panel fastening, and hobby builds. They are generally not rated for high-torque or structural load-bearing use. For exact tensile specifications, please contact us to confirm before using in safety-critical applications.

Anodized aluminum typically offers good corrosion resistance for light outdoor or humid conditions — better than bare aluminum, and generally suitable for indoor electronics and light workshop use. However, these screws are not specifically rated for marine or highly corrosive environments. For prolonged outdoor exposure, we recommend verifying suitability with your specific application or contacting us.

These use the 6-32 UNC (Unified National Coarse) thread standard, which is one of the most common thread sizes in US electronics and enclosure hardware. They are compatible with any standard 6-32 UNC nut, threaded insert, or captive nut. This is not a metric thread — do not attempt to use with M3 hardware, as the thread pitch and diameter are different.

A flat knurled head sits flush or nearly flush with the surface, making it ideal for low-profile panel installations where a domed or winged head would protrude. The knurling pattern provides enough grip for finger-tightening without tools, while keeping a clean, compact profile. This makes them particularly popular in electronics enclosures, rack panels, and instrument cases where clearance is limited.

No. Anodizing is an electrochemical surface treatment that adds only a very thin oxide layer (typically a few microns) to the aluminum surface. It does not meaningfully affect thread dimensions or fit. All 10 color options share the same 6-32 UNC thread specification and are interchangeable dimensionally.

Each variant is sold separately by thread length, color, and quantity. To get multiple colors or lengths, simply add each desired variant to your cart individually. Bulk quantity options (up to 20 pcs per variant) are available for larger projects, and ordering multiple variants in a single checkout is fully supported.