Match the thread diameter (M2, M3, M4, M5, M6, M8) to your tapped hole or nut. For length, measure the depth of the threaded hole or the thickness of the material being clamped, then add 1–2 thread pitches for full engagement. As a quick reference: 10mm ≈ 3/8", 16mm ≈ 5/8", 25mm ≈ 1", 40mm ≈ 1-9/16".

These are designed for hand-tightening applications where moderate clamping force is sufficient — typically securing panels, covers, and access doors. 304 stainless steel generally provides good tensile strength for light-to-medium duty fastening. For high-torque or structural load-bearing joints, a hex bolt tightened with a wrench is typically recommended.

Yes. 304 (A2) stainless steel offers good corrosion resistance and is generally suitable for outdoor, humid, and mildly corrosive environments. For marine or highly chloride-rich environments, 316 (A4) stainless steel is typically recommended instead.

These use standard ISO metric coarse threads. M2 through M8 sizes follow standard metric pitch specifications and are not compatible with UNC/UNF imperial threads. Please confirm your tapped hole is metric before ordering.

No tools are required for typical use. The knurled head is designed for finger-tightening, making these ideal for panels, enclosures, and equipment that requires frequent access. For initial installation into a new tapped hole, a light assist with pliers may occasionally be needed on smaller sizes like M2.

M3 is the most common size for electronics enclosures, Raspberry Pi cases, and 3D printer frames. M2 and M2.5 are typically used for very compact electronics. M4 and M5 are generally preferred for heavier panels or aluminum extrusion assemblies. M6 and M8 are suited for larger structural panels.

These feature a small cylindrical knurled head with a straight or diamond knurl pattern for secure finger grip. Exact head diameter varies by thread size. Please contact us to confirm specific head dimensions for your selected size if clearance is a concern.