M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
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M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors

M3 x 12mm Anodised Aluminium Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors

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Price:
$1.35 USD
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In stock (500 units), ready to be shipped

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Description

 

M3 x 12mm Knurled Thumb Screws — Anodised Aluminium Flat Head for Tool-Free Assembly

If you've ever stripped a tiny M3 screw trying to reach it with a driver in a tight enclosure, you know the frustration. These M3 x 12mm anodised aluminium knurled thumb screws are built for makers, hobbyists, and engineers who need fast, repeatable, tool-free fastening — whether you're assembling a Raspberry Pi case, closing up an RC chassis, or securing a custom panel.

Each screw is machined from aluminium and finished with a durable anodised coating available in 10 colors: Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown & Orange. The flat head profile measures M3 in thread diameter with a 12mm (≈15/32") shank length. Available in pack quantities of 1, 4, 10, 20, 50, and 100 pieces to suit single-unit builds or production runs.

Typical use cases include securing 3D printer access panels, fastening electronics enclosures where frequent access is needed, color-coding fasteners on RC car builds, and assembling DIY aluminum extrusion frames where hand-tightening is preferred over tool-driven screws.

🔩 Compatibility: M3 metric thread (ISO 68-1), pitch typically 0.5mm. Fits standard M3 nuts, threaded inserts, and tapped M3 holes. Not compatible with imperial #4-40 or UNC thread systems.

✅ Key Features of These M3 Knurled Thumb Screws

  • ✋Knurled Grip Head — The textured knurl pattern provides enough friction for firm hand-tightening without slipping, eliminating the need for a screwdriver in tool-free fastening applications.
  • 🎨10 Anodised Colors — Anodising integrates color into the aluminium surface rather than coating it, giving each screw a finish that resists chipping and is easy to use for color-coded assembly or visual identification on RC builds and custom panels.
  • ⚖️Lightweight Aluminium Construction — Aluminium's low density makes these screws a practical choice for weight-sensitive builds like drone frames, RC models, and portable electronics enclosures where every gram counts.
  • 📐Flat Head Profile — The flat head sits flush or near-flush against the mating surface, reducing snag points on panels and enclosures and giving assemblies a cleaner finished appearance.
  • 📦Flexible Pack Quantities — Available from single pieces up to 100-count packs, so you can grab a few for a one-off prototype or stock up for a production batch of custom enclosures or maker kits.
  • 🔄Reusable Fastening — Designed for repeated installation and removal cycles, these thumb screws are well-suited for access panels, battery covers, and any assembly that needs to be opened regularly without wearing out the fastener.

📐 Technical Specifications — M3 Flat Head Knurled Thumb Screws

Thread Standard M3 Metric (ISO 68-1)
Thread Pitch Typically 0.5mm (metric coarse)
Screw Length 12mm (≈15/32")
Head Style Flat head, knurled grip
Material Aluminium (anodised)
Finish / Color Anodised — Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Brown & Orange
Drive Style Hand-tighten (no tool required)
Head Diameter See variant options
Pack Quantity 1 / 4 / 10 / 20 / 50 / 100 pcs
Recommended Use Light-duty, hand-tightened assemblies; not for structural or high-torque joints
Compatible Mating Hardware Standard M3 nuts, M3 threaded inserts, tapped M3 holes
⚠️ Note: Head diameter and exact knurl dimensions are not listed on the packaging. If your application has tight clearance requirements, please contact us to confirm before ordering.

❓ Frequently Asked Questions

How do I choose the right length for M3 thumb screws?

These screws are 12mm (approximately 15/32") in length. As a general rule, the screw length should be at least 1.5× the thread diameter for a secure hold. For M3 screws, that means a minimum engagement depth of about 4.5mm in the mating material. If your panel or bracket is thinner, consider using a nut on the back side.

How strong are anodised aluminium thumb screws?

Aluminium thumb screws are generally suited for light-duty, hand-tightened applications. They are not intended for high-torque or structural load-bearing joints. For M3 size, typical hand-tightening torque is in the range of 0.3–0.6 N·m. If higher clamping force is required, a metal tool-driven fastener is recommended.

Can these thumb screws be used outdoors?

Anodised aluminium offers moderate corrosion resistance, making these screws suitable for light outdoor or semi-exposed use. However, they are not recommended for prolonged submersion or highly corrosive marine environments. For harsh outdoor conditions, stainless steel fasteners are generally a better choice.

What thread standard do these thumb screws use?

These screws use the M3 metric thread standard (ISO 68-1), with a typical pitch of 0.5mm. They are compatible with standard M3 nuts, threaded inserts, and tapped holes following the metric coarse thread specification. They are not compatible with imperial #4-40 or UNC thread systems.

Do I need a screwdriver or tool to install these?

No. The knurled grip pattern on the head is specifically designed for hand-tightening without any tools. This makes them ideal for panels, enclosures, and assemblies that need to be opened and closed frequently — such as electronics project boxes, 3D printer covers, and RC battery hatches.

Will the anodised color chip or fade over time?

Anodising is an electrochemical process that integrates the color into the surface of the aluminium rather than sitting on top like paint. Under normal indoor use, the finish is generally durable and resistant to chipping. Prolonged UV exposure or abrasive contact may cause gradual fading over time.

How do I pick the right color for my project?

We offer 10 anodised colors: Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown & Orange. Black and Silver are the most popular for electronics and PC builds. Bright colors like Royal Blue, Green, or Red Wine are commonly used for RC models and custom panels where visual identification matters.

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

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