M3 x 5-100mm Knurled Thumb Screws Aluminium Alloy+Stainless Steel High Type Bolt

These use standard M3 coarse thread with a 0.5 mm pitch. They are compatible with any M3-tapped hole, M3 threaded insert, or M3 hex nut that follows the ISO metric standard.

Measure the total thickness of the material(s) being clamped, then add 2–4 mm for thread engagement beyond the panel. For example, a 3 mm panel with a nut on the back typically needs at least a 6–8 mm shaft. Lengths from 5 mm to 100 mm are available to cover thin PCB mounts through deep-reach fixture work.

The stainless steel shaft provides solid thread strength suitable for light-to-medium clamping loads in electronics enclosures, RC models, 3D printer panels, and instrument housings. They are not rated for high-torque structural joints or load-bearing applications where a hex bolt with a torque specification is required.

Anodising is an electrochemical surface treatment that integrates into the aluminium oxide layer rather than sitting on top like paint. Under normal hand-tightening use, the colour is durable. Abrasive contact or repeated over-tightening with tools can wear the finish over time.

The stainless steel shaft resists rust and oxidation in humid or mildly corrosive conditions. The anodised aluminium head also has inherent corrosion resistance. For prolonged outdoor exposure or salt-spray environments, consider applying a light protective coating and inspect periodically.

Both packs contain identical screws — the only difference is quantity. The 1-piece option is ideal for replacing a single lost fastener or sampling a colour before committing to a larger order. The 5-piece pack offers a lower per-unit cost and is suited for projects requiring multiple fasteners of the same size and colour.

Yes. The M3 × 0.5 mm thread is fully compatible with standard M3 hex nuts, nylon lock nuts, wing nuts, and heat-set or press-fit M3 threaded inserts commonly used in 3D-printed parts and aluminium extrusions.