🔧 Product Overview: M2 Knurled Thumb Screws – Aluminum Alloy Hand Grip Knob Bolts (M2 x 4mm, Anodized Colors)
For compact electronics, 3D printers, and small DIY projects, these M2 knurled thumb screws offer a lightweight, tool‑less fastening solution with a pop of color. Machined from 6061 aluminum alloy and anodized in multiple vibrant colors, the flat head features a diamond knurled surface that provides a secure, non‑slip grip for hand tightening and loosening – no screwdriver needed. Fully threaded with M2 coarse pitch (0.4mm), and a 4mm thread length (measured under the head). Ideal for small enclosures, camera accessories, RC models, and PC modding where space is tight and a colorful accent is desired.
✨ Why These Mini Knurled Thumb Screws Are a Perfect Fit
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Lightweight 6061 aluminum alloy – Strong yet lightweight, reduces overall assembly weight. Anodized finish provides corrosion resistance and vibrant color.
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Flat knurled head for tool‑less grip – Diamond knurl pattern gives you excellent finger traction for hand tightening and loosening – no tools required.
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Available in multiple anodized colors – Choose from a range of colors (e.g., Red, Blue, Black, Gold, Silver, etc.) to match your build or add a custom accent.
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M2 metric thread – fully threaded – Standard coarse pitch (0.4mm). Threads run the entire 4mm length for maximum grip.
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4mm thread length (under head) – Ideal for very thin panels, PCB mounting, and shallow threaded holes.
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Non‑magnetic & corrosion‑resistant – Safe for sensitive electronics and won't rust in indoor or light outdoor use.
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Wide applications – 3D printer bed leveling knobs, computer case thumb screws, camera rigs, RC car body mounts, drone components, and small electronics enclosures.
📏 Technical Specifications – M2 Knurled Thumb Screws (4mm Length)
| Specification |
Details |
| Product Type |
Knurled Thumb Screws (Hand Grip Knob Bolts) |
| Material |
6061 Aluminum Alloy (anodized) |
| Thread Size |
M2 |
| Thread Pitch |
0.4mm (metric coarse) |
| Thread Length (under head) |
4mm |
| Length Measurement |
Under head – from underside of flat head to tip (head not included) |
| Head Style |
Flat head with diamond knurling |
| Drive Style |
Hand grip (toolless) |
| Finish |
Anodized (multiple colors available) |
❓ FAQs – M2 Knurled Thumb Screws
🔸 What are the typical uses for M2 x 4mm thumb screws?
These tiny screws are perfect for 3D printer bed leveling knobs (small printers), PCB mounting, camera lens caps, RC car body mounts, drone frame fasteners, laptop and tablet repairs, and miniature electronics enclosures. The 4mm thread length is ideal for thin panels (1‑2mm) or shallow threaded holes.
🔸 How is the 4mm thread length measured? Is it enough for my project?
Thread length is measured from the underside of the flat head to the tip. The 4mm threaded shank is suitable for material thickness up to 2‑3mm when using a nut, or for pre‑tapped holes up to 4mm deep. For thicker panels, consider a longer version (contact us for custom lengths).
🔸 Are these screws fully threaded? What is the thread pitch?
Yes – they are fully threaded from under the head to the tip. The thread pitch is standard M2 coarse: 0.4mm.
🔸 Will the anodized color wear off?
Anodizing is an electrochemical process that creates a durable, bonded oxide layer. It will not peel like paint. Under normal hand use, the color will remain vibrant for years. Heavy abrasion may wear the finish, but typical thumb screw applications are gentle.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching M2 nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The knurled head is designed for hand grip only – do not use tools on the knurling.
🔸 What colors are available?
We offer a range of anodized colors – please select your preferred color from the dropdown options when ordering. Common colors include Black, Silver, Red, Blue, Gold, Green, and Purple. Note that colors may appear slightly different under natural sunlight vs. indoor lighting.
