#6-32 UNC Knurled Thumb Screws — A2 Stainless Steel, Multi-Color, 22 Lengths

Measure the total thickness of the material you need to clamp or fasten, then add typically 3–5mm for thread engagement. For example, if your panel is 6mm (about 1/4") thick, a 10mm or 12mm screw generally works well. Lengths in this listing range from 4mm (≈5/32") to 40mm (≈1-9/16"). When in doubt, size up — a slightly longer screw is easier to work with than one that's too short.

A2 stainless steel thumb screws generally offer good tensile strength suitable for light-to-medium clamping and panel-retention applications. They are not typically rated for structural or high-vibration loads. For exact load ratings specific to your application, contact us to confirm.

The A2 stainless steel variants are generally suitable for outdoor and moist environments due to their inherent corrosion resistance. Aluminum variants are also corrosion-resistant but may be less suitable for highly saline or chemically aggressive conditions. Colored anodized finishes typically add a thin additional layer of surface protection.

Yes. These screws use the #6-32 UNC (Unified National Coarse) thread standard, one of the most common fastener sizes in the US. They are compatible with any standard #6-32 UNC nut, threaded insert, or tapped hole. They are not compatible with metric M3 threads, which have a different pitch and diameter.

Choose A2 stainless steel when you need greater strength, durability, or corrosion resistance in demanding environments. Choose aluminum when weight savings matter — aluminum is typically about one-third the weight of steel — and when the application involves lighter clamping forces, such as electronics enclosures, camera cage builds, or 3D printer frames.

The colored finishes (Royal Blue, Green, Black, Wine Red, Purple, etc.) are generally achieved through anodizing or surface treatment, which typically adds a thin layer of corrosion protection in addition to the visual effect. This also makes them useful for color-coded identification in multi-fastener assemblies. Contact us to confirm the exact finish process for a specific color.

No. These are designed exclusively for hand-tightening using the knurled head — no tools required. The knurled grip pattern provides sufficient friction for firm finger-tightening in most panel and enclosure applications. They do not have a driver slot or hex socket, so they are not intended for use with a screwdriver, wrench, or power tool.