Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Reaching for a screwdriver every time you need to adjust a panel, cover, or jig slows you down. Makers, hobbyists, and workshop builders who need fast, tool-free fastening rely on knurled thumb screws — and finding the right size in the right colour is half the battle. These aluminium knurled thumb screws in M5 and M6 thread sizes give you a secure, repeatable grip with nothing but your fingers.
Each screw is machined from aluminium alloy and features a high-profile knurled head with a flat underside (flat head style), making it easy to seat flush against panels or brackets. The shoulder bolt design provides a clean, guided fit. Thread lengths run from 30 mm to 45 mm (approximately 1.18 in to 1.77 in), covering M5 × 30 / 35 / 40 / 45 mm and M6 × 30 / 35 / 40 / 45 mm. Available in 10 anodized colours: Royal Blue, Green, Golden, Dark Red, Black, Silver, Purple, Rose Red, Sky Blue, and Orange.
Typical use cases include 3D printer frame assembly requiring frequent access panels, CNC router enclosure latching where tool-free removal is essential, and RC car body mounting with colour-coded knurled thumb screws for quick identification. The metric thread sizing makes these a natural fit for aluminium extrusion builds, electronics enclosures, and DIY workshop fixtures.
| Material | Aluminium alloy (anodized) |
|---|---|
| Thread Standard | Metric (ISO) |
| Thread Sizes | M5, M6 |
| Thread Length (excl. head) | 30 mm, 35 mm, 40 mm, 45 mm (1.18 in – 1.77 in) |
| Head Style | Flat head, high-profile knurled |
| Drive Style | Thumb screw (hand-driven, no tool required) |
| Finish | Anodized — 10 colours available |
| Head Diameter | See variant options |
| Head Height | See variant options |
| Thread Pitch | See variant options |
| Pack Quantity | 1 Pcs / 2 Pcs / 5 Pcs |
| Weight per Piece | See variant options |
M5 has a 5 mm nominal thread diameter and M6 has a 6 mm nominal thread diameter. Check the tapped hole or insert in your panel or bracket — the thread size must match exactly. If you are unsure, use a thread gauge or measure the inner diameter of the hole. M5 is common in lighter aluminium extrusion frames; M6 is typical in heavier structural assemblies.
The listed length (30–45 mm) is the thread length excluding the head. Measure the depth of your threaded hole or the thickness of the material being clamped, then add 2–3 mm of thread engagement minimum. For thin panels (under 10 mm), a 30 mm screw typically provides sufficient engagement; for deeper housings or stacked panels, choose 40 or 45 mm.
These aluminium thumb screws are designed for panel retention, access covers, and light-duty clamping — applications where hand-tightening is sufficient. They are not rated for high-torque structural joints or load-bearing connections. For structural fastening, steel bolts with a torque specification are recommended.
Anodizing creates an oxide layer that improves corrosion resistance compared to bare aluminium, making these screws suitable for indoor environments and light outdoor use in dry or low-humidity conditions. For prolonged outdoor or marine exposure, consider stainless steel alternatives, as aluminium can corrode in salt-spray or highly acidic environments.
Yes. M5 and M6 are the two most common thread sizes used with 20-series and 30-series aluminium extrusion profiles. These thumb screws thread directly into T-nuts or drop-in nuts seated in the extrusion slot, making them ideal for frequently removed panels, guards, or covers on 3D printers, CNC routers, and workshop fixtures.
Using different anodized colours for different access zones — for example, black for structural fasteners and blue for service panels — lets you identify the correct screws at a glance without reading labels. This is especially useful in multi-panel enclosures, RC vehicles, and workshop jigs where fast disassembly matters.
Each pack option contains that number of identical screws in the same size and colour. Choose 1 Pcs to replace a single lost fastener, 2 Pcs for paired mounting points, or 5 Pcs for panel corners and multi-point covers. Buying in the 5 Pcs pack typically offers a lower per-unit cost compared to buying singles.
