🎨 Product Overview: M3 x 4mm Aluminum Alloy Knurled Thumb Screws – PC Case Hand Grip Knob Bolts (5mm Head)
Add a custom touch to your PC build, 3D printer, or electronics project with these colorful M3 knurled thumb screws. The compact 4mm thread length (measured under the head) is perfect for securing PC case side panels, graphics card brackets, and small electronics enclosures. The 5mm diameter x 5mm height knurled head provides a comfortable, non‑slip grip for hand tightening – no tools required. Made from lightweight, corrosion‑resistant aluminum alloy with an anodized finish available in 10 vibrant colors. Fully threaded with M3 coarse pitch (0.5mm). Ideal for modders, DIY enthusiasts, and anyone who wants toolless access to their equipment.
✨ Why These Mini Knurled Thumb Screws Are a PC Modder's Favorite
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Compact 4mm thread length (under head) – Ideal for thin panels (1‑2mm steel or plastic) and shallow threaded holes found in PC cases and small electronics.
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5mm head diameter x 5mm head height – Small, low‑profile knurled head fits tight spaces while still providing a secure finger grip.
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10 vibrant anodized colors – Choose from a wide range of colors to match your build or add a custom accent (select from options).
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Lightweight aluminum alloy construction – Strong yet lightweight, corrosion‑resistant, and durable. Anodized finish won't peel.
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M3 metric thread – fully threaded – Standard coarse pitch (0.5mm). Threads run the entire 4mm length for secure engagement.
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Tool‑less operation – Diamond knurl pattern provides excellent finger traction – no screwdriver needed for installation or removal.
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Wide applications – PC case side panels, graphics card brackets, 3D printer bed leveling knobs, camera rigs, RC models, and small electronics enclosures.
📏 Technical Specifications – M3 Knurled Thumb Screws (4mm Thread, 5mm Head)
| Thread Size |
M3 (3mm diameter) |
| Thread Pitch |
0.5mm (metric coarse) |
| Thread Length (under head) |
4mm |
| Length Measurement |
Under head – from underside of knurled head to tip (head not included) |
| Head Diameter |
5mm (±0.2mm) |
| Head Height / Thickness |
5mm (±0.2mm) |
| Head Style |
Knurled cylinder (diamond knurl pattern) |
| Drive Style |
Hand grip (toolless) |
| Material |
Aluminum alloy (6061 or similar) |
| Finish |
Anodized (10 colors available) |
| Tolerance |
±0.2mm |
❓ FAQs – M3 Aluminum Knurled Thumb Screws
🔸 Will these screws fit my PC case?
Most PC case side panels and graphics card brackets use M3 threads. The 4mm thread length is designed for panel thicknesses up to 2‑3mm with standard threaded holes. For thicker panels or when using a nut, consider a longer version. Check your existing screws – if they are M3, these will fit.
🔸 How is the 4mm thread length measured? Is it the total length?
Thread length is measured from the underside of the knurled head to the tip. The head itself is not included. The total length (including head) is 4mm thread + 5mm head = approximately 9mm overall.
🔸 Are these screws fully threaded? What is the thread pitch?
Yes – fully threaded from under the head to the tip. The pitch is standard M3 coarse: 0.5mm.
🔸 What colors are available?
We offer 10 anodized colors – please select your preferred color from the dropdown options. Common colors include Black, Silver, Red, Blue, Gold, Green, Purple, Orange, Pink, etc. (exact colors vary by batch).
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching M3 nuts or in pre‑tapped holes. For through‑hole applications with thin material, a nut can be used on the back side. However, the 4mm thread length limits nut engagement for materials over 2mm thick.
🔸 Are these screws magnetic? Will they affect my PC components?
Aluminum is non‑magnetic, so these thumb screws will not interfere with hard drives, fans, or other sensitive electronics. They are completely safe for use inside computers.
