M3 x50-100mm Knurled Thumb Screws Aluminium Alloy Hand Grip Knob Bolts High Type

These screws use an M3 metric thread with a 0.5 mm pitch. This is the standard M3 coarse pitch, compatible with M3 threaded holes, brass heat-set inserts, and M3 hex nuts commonly found in electronics enclosures, 3D-printed parts, and RC frames.

Measure the total thickness of the material(s) being clamped, then add the depth of the threaded hole or nut. The shank length (excluding head) should be equal to or slightly longer than this combined dimension. For example, if you are fastening a 3 mm panel into a 10 mm standoff, a 50 mm shank provides ample thread engagement. Sizes are listed excluding the head height.

Aluminium alloy thumb screws are designed for hand-tightened, low-torque applications such as panel retention, access covers, jig adjustments, and light fixture assembly. They are not intended for high-load structural joints or applications requiring torque-wrench tightening. For high-stress connections, consider stainless steel fasteners instead.

The anodised coating provides a hard oxide layer that resists light surface oxidation and minor abrasion in typical indoor environments. Anodising is not a substitute for stainless steel in wet, marine, or chemically aggressive environments. For outdoor or high-humidity use, consider applying a light protective coating or choosing stainless alternatives.

Yes. The M3 × 0.5 mm thread is fully compatible with standard M3 hex nuts, nylon lock nuts, and brass heat-set inserts. Ensure the mating thread is also M3 × 0.5 mm (coarse) and that the clearance hole in any unthreaded panel is at least 3.2 mm in diameter.

Both pack options contain identical screws of the same size and colour. The 1-piece pack is suited for replacing a single lost fastener or testing a size before committing to a larger quantity. The 5-piece pack offers a lower per-unit cost and is practical for new builds, prototyping, or maintaining a spares inventory.

No. All colour variants share identical thread size (M3 × 0.5 mm), shank length, and head geometry. The anodised colour is a surface treatment only and does not alter any mechanical dimension. Colour selection is purely aesthetic and useful for colour-coding assemblies.