Aluminium + Stainless steel Knurled Thumb Screws M5 Thumbscrew Bolt 6-100mm Long

Measure the total grip length — the combined thickness of all materials the screw must pass through — then add 1–2mm for thread engagement beyond the last layer. For thin panel retention (e.g., 1–3mm sheet metal or acrylic), lengths of 6–12mm are typically sufficient. For deeper extrusion slots or stacked panels, 20–40mm is common. For structural through-bolting, 50–100mm options are available.

Yes. The stainless steel shaft is machined to standard M5 × 0.8mm metric coarse thread, which mates with any M5 hex nut, nylon lock nut, T-slot nut, or M5 threaded insert. They are not compatible with imperial threads such as 10-32 or 10-24.

The head-to-shaft joint is designed for hand-tightening loads. These thumb screws are intended for tool-free, finger-torque applications — not for high-torque mechanical fastening. Applying a wrench or driver to the head is not recommended and may damage the joint. For applications requiring torque beyond hand-tight, a standard hex bolt is more appropriate.

Aluminium naturally forms a thin oxide layer that acts as a self-protecting barrier against further corrosion in most indoor environments. The stainless steel shaft resists rust independently. For outdoor or high-humidity environments, periodic inspection is recommended, though these screws are well-suited to typical workshop, lab, and electronics enclosure conditions.

Yes, with the appropriate T-slot nut. Insert an M5 T-slot nut into the extrusion channel, then thread the thumb screw in by hand. This is a common setup for 3D printer enclosure panels, CNC guards, and modular workshop fixtures where panels need to be removed frequently. Confirm the T-slot nut spec matches M5 × 0.8mm before ordering.

Yes — the screw itself is identical across all pack sizes. The 1pcs option is useful for testing fit before committing to a larger quantity. The 5pcs and 10pcs packs offer a lower per-unit cost and are suited for builds requiring multiple fastening points or for keeping workshop stock on hand.

Exact head dimensions vary by length variant and are not standardised across all sizes. Please contact us to confirm head diameter and height for your specific length before ordering if clearance is critical to your design.