🔘 M3 Knurled Thumb Screws – Aluminium Mesh Hand Grip Knob Bolts (35mm & 40mm Thread Lengths)
You’re looking for a lightweight, attractive thumbscrew that’s easy to grip and won’t rust. These M3 knurled thumb screws are machined from 6061 aluminium with a distinctive mesh knurling pattern – giving you a secure, non‑slip hold even with oily fingers. The cylinder head is anodised in your choice of colours (contact us for options), adding a custom look to your PC case, camera rig, or workshop jig. Fully threaded, with 35mm or 40mm stud lengths measured under the head. Perfect for tool‑less fastening in electronics, 3D printers, model making, and any project where weight and corrosion resistance matter.
✨ Key Features – M3 Aluminium Knurled Thumb Screws
- 🔘 Mesh knurled cylinder head – Fine diamond‑mesh pattern provides excellent fingertip grip for hand tightening without tools.
- ⚖️ Lightweight 6061 aluminium – About 1/3 the weight of steel. Non‑magnetic and thermally conductive.
- 🎨 Anodised colour options – Available in multiple colours (black, red, blue, gold, etc.) – contact us for availability.
- 🛡️ Corrosion‑resistant finish – Anodising protects against oxidation and wear, keeping the screws looking great.
- 📏 M3 metric thread (3mm diameter, 0.5mm pitch) – Standard size for small electronics, PC components, and light machinery.
- 📐 Fully threaded stud – 35mm or 40mm (under head) – Thread runs the entire length under the head for maximum grip in tapped holes or with nuts.
- 🔧 Versatile use – Computer case modding, 3D printer bed leveling, camera rigs, RC models, and DIY fixtures.
📏 Specifications – M3 Aluminium Knurled Thumb Screws
| Thread Diameter (M) |
Thread Pitch (mm) |
Head Style |
Head Diameter (approx.) |
Head Height (approx.) |
Thread Lengths (mm, under head) * |
Material / Finish |
| M3 |
0.5 |
Cylinder knurled (mesh pattern) |
~8‑10 mm |
~6‑8 mm |
35 mm ・ 40 mm |
6061 aluminium / Anodised (colours available) |
* Length measured from underside of head to tip, fully threaded. Select length and colour from dropdown. For other colours or custom lengths, please contact us.
🛠️ Perfect for Tool‑Less Fastening & Custom Builds
| Application |
Typical Use |
| PC case modding |
Side panel thumbscrews, radiator mounting, drive bay fasteners |
| 3D printers & CNC |
Bed leveling knobs, spool holders, enclosure access |
| Camera rigs & tripods |
Quick‑release plates, bracket locks, monitor mounts |
| RC models & hobby |
Body mounts, battery covers, adjustable links |
❓ Frequently Asked Questions – M3 Aluminium Thumb Screws
1. How do I measure the length of these thumb screws?
Length is measured from the underside of the head (where the knurling ends) to the tip of the threaded shaft. The head itself is NOT included. So a “35mm” screw has a 35mm long threaded stud under the head. This matches our listing.
2. Are these screws fully threaded? What about the 40mm version?
Yes – both 35mm and 40mm lengths are fully threaded from under the head to the tip, giving you maximum grip in tapped holes or when using a nut.
3. Will aluminium thumb screws rust? Can I use them outdoors?
Aluminium naturally forms a protective oxide layer, and the anodised finish adds extra corrosion resistance. They are suitable for indoor and light outdoor use. For continuous saltwater or harsh chemical environments, we recommend stainless steel thumbscrews.
4. Do I need a nut or washer with these screws?
If your equipment has a pre‑tapped M3 hole, no nut is needed. For plain holes, use a standard M3 metric nut (0.5mm pitch). A flat washer is optional for load distribution.
5. What colours are available? How do I order a specific colour?
We offer a range of anodised colours – please contact us or select from the dropdown if options are listed. Standard colours may include black, silver, red, blue, gold, and green. Custom colours available on request.
6. Are these screws strong enough for structural use?
Aluminium has lower tensile strength than steel. These thumb screws are designed for light‑duty fastening (enclosures, adjustments, clamps). For heavy load‑bearing applications, use steel thumb screws.
