M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts
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M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob BoltsM3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts

M3 / M3.5 Knurled Thumb Screws – Anodized Aluminum Alloy Round Knob Bolts

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M3 / M3.5 Knurled Thumb Screws — Tool-Free Fastening in 10 Anodized Colors

If you've ever struggled to find a screwdriver just to open an access panel or adjust a jig, you know how frustrating it is. These M3 / M3.5 knurled thumb screws are built for makers, hobbyists, PC builders, and engineers who need fast, repeatable hand-tightening without reaching for a tool every time.

Each screw is machined from aluminum alloy with a fully knurled round head for a secure finger grip. Available in thread diameters of M3 (3mm) and M3.5 (3.5mm), with lengths ranging from 4.5mm (≈3/16") to 25mm (≈1"), and sold in 1-piece or 5-piece quantities. The anodized finish is available in 10 colors — Wine Red, Pink, Auratus (gold), Royal Blue, Sky Blue, Bright Black, Bright Silver, Emerald Green, Purple, and Orange — so you can color-code your builds or match your aesthetic.

Typical use cases include PC case panel fasteners, 3D printer frame assemblies, electronics enclosure covers, optical bench fixtures, and DIY jig-and-fixture setups where tool-free knurled thumb bolt access is a priority.

🔩 Thread Compatibility: Standard metric coarse thread — M3 or M3.5. Compatible with ISO metric-threaded nuts, heat-set inserts, and tapped holes. Not compatible with UNC/UNF inch threads.

✅ Key Features of These Knurled Aluminum Thumb Screws

  • ✋Knurled Round Head Design — The fully knurled circumference provides a firm, slip-resistant grip for confident hand-tightening, even with slightly oily or damp fingers.
  • 🎨10 Anodized Color Options — Anodized aluminum alloy finish resists scratching and corrosion better than bare metal, and lets you color-code fasteners across different assemblies or panels.
  • 📐Wide Size Range — Available in M3 and M3.5 thread diameters with lengths from 4.5mm to 25mm, covering the most common hand-tighten thumb screw sizes for electronics, PC builds, and light fabrication.
  • ⚡Tool-Free Installation — Designed for frequent removal and reinstallation without tools, making them ideal for access panels, enclosure lids, and adjustable fixtures in workshop or lab environments.
  • ⚖️Lightweight Aluminum Alloy Construction — Aluminum alloy keeps weight low compared to steel alternatives, which matters in weight-sensitive builds like drone frames, camera rigs, and portable enclosures.
  • 📦Flexible Quantity Options — Available as single pieces (1pcs) for replacements or as 5-piece sets for new builds, so you only buy what you need without overstocking.

📐 Technical Specifications — Knurled Thumb Screws

Product Type Knurled Thumb Screw / Round Knob Bolt
Material Aluminum Alloy
Finish Anodized (color-dyed)
Thread Standard Metric Coarse (ISO 68-1)
Thread Diameter M3 (3mm) / M3.5 (3.5mm)
Available Lengths (M3) 6mm (≈1/4"), 8mm (≈5/16"), 10mm (≈3/8")
Available Lengths (M3.5) 4.5mm (≈3/16"), 6mm (≈1/4"), 8mm (≈5/16"), 10mm (≈3/8"), 12mm (≈15/32"), 16mm (≈5/8"), 20mm (≈25/32"), 25mm (≈1")
Head Style Round Knurled (hand-grip)
Drive Style Finger-tighten (no drive recess)
Available Colors Wine Red, Pink, Auratus (Gold), Royal Blue, Sky Blue, Bright Black, Bright Silver, Emerald Green, Purple, Orange
Pack Quantity 1 piece or 5 pieces (see variant options)
Recommended Use Hand-tightened, low-torque applications
Outdoor Suitability Light sheltered use; not rated for prolonged salt/moisture exposure
⚠️ Sizing Note: Thread pitch and exact head diameter vary by size. If you need precise dimensional drawings for engineering applications, contact us to confirm before ordering.

❓ Frequently Asked Questions

How do I choose the right length for my thumb screw?

Measure the total thickness of the material you need to clamp or fasten, then add 2–3 thread diameters for adequate thread engagement. For example, M3 x 6mm (≈1/4") is typically used for thin panels up to 3mm, while M3.5 x 25mm (≈1") suits thicker assemblies. When in doubt, choose the next size up to ensure sufficient grip.

What clamping force can these thumb screws handle?

These knurled thumb screws are generally intended for hand-tightened, low-torque applications such as panel access covers, electronics enclosures, jigs, and fixtures. They are not rated for high-load structural connections. For exact torque or load specifications, contact us to confirm.

Can these thumb screws be used outdoors or in humid environments?

The anodized aluminum alloy finish provides a degree of corrosion resistance suitable for light indoor and sheltered outdoor use. For prolonged exposure to moisture, salt spray, or harsh chemicals, stainless steel fasteners are generally recommended instead.

What thread standard do these use — are they compatible with my existing hardware?

These screws use standard metric coarse threads (M3 and M3.5), compatible with any M3 or M3.5 metric-threaded nut, heat-set insert, or tapped hole following ISO 68-1 standards. They are not compatible with UNC/UNF inch-standard threads. If you're unsure, check the thread pitch of your existing hardware before ordering.

Do I need any tools to install or remove these thumb screws?

No tools are required for standard installation. The knurled round head is designed for finger-tightening, making them ideal for panels, enclosures, and equipment that require frequent access. For applications needing a more secure hold, a light assist with a flat-head screwdriver is generally possible on the head edge.

Which thread size should I choose — M3 or M3.5?

Choose based on the thread size of your existing tapped hole or threaded insert. M3 (3mm diameter) is more common in electronics, small enclosures, and PC hardware. M3.5 (3.5mm diameter) is typically found in certain PC cases, optical equipment, and European-standard hardware. Check your existing hardware before ordering — the two sizes are not interchangeable.

Will the anodized color fade or chip over time?

Anodized finishes are generally more durable than painted surfaces and resist chipping and scratching under normal indoor use. Prolonged UV exposure may cause gradual color shift over time. The finish is not a surface coating — it is an electrochemical conversion of the aluminum surface itself, which means it typically holds up better than spray paint or powder coat in comparable conditions.

Are these suitable for use in 3D printers or PC builds?

Yes — these are commonly used in 3D printer frame assemblies (particularly for panel access and enclosure covers), PC case side panels, and DIY electronics enclosures. The M3 size is especially popular for these applications. Verify the thread size and length against your specific build requirements before ordering.

🛒 Select your size, color, and quantity above, then add to cart — ships from our US warehouse.

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