M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors
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M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 ColorsM3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors

M3×20mm Anodized Aluminum Knurled Thumb Screws — Flat Head Hand-Grip Bolts, 10 Colors

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$1.54 USD
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In stock (500 units), ready to be shipped

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Description

 

M3×20mm Knurled Thumb Screws — Tool-Free Fastening in 10 Anodized Colors

If you've ever stripped a panel screw reaching for a screwdriver in a tight spot, or needed a fastener that's both functional and color-coded, these M3×20mm knurled thumb screws are built for you. Makers, PC builders, electronics hobbyists, and light fabricators who need repeatable, tool-free access to enclosures and panels will find these a practical everyday solution.

Each screw is machined from aluminum alloy with a durable anodized finish and features a flat knurled head for hand-grip tightening. Thread diameter is M3 (≈0.118"), screw length is 20mm (≈25/32" / 0.79"), available in 10 colors: Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown & Orange. Pack sizes range from 1 to 100 pieces to suit single repairs or workshop stock.

Typical use cases include PC case panel fasteners for tool-free side panel removal, 3D printer frame and enclosure assembly where frequent access is needed, and electronics project boxes or DIY aluminum enclosures where color-coded screws help identify sections at a glance.

🔩 Thread Compatibility: Standard M3 metric thread (ISO 68-1) — fits M3 nuts, threaded inserts, and tapped holes. Verify thread pitch with your mating component before assembly.

✅ Key Features of These M3 Knurled Thumb Screws

  • ✋Knurled Flat Head for Hand-Grip — The textured knurl pattern on the flat head provides enough grip for finger-tightening in tool-free panel fastening applications without slipping.
  • 🎨10 Anodized Color Options — Anodized aluminum thumb screws in Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Brown & Orange allow color-coding by zone or panel.
  • ⚖️Lightweight Aluminum Construction — Aluminum alloy keeps weight low compared to steel fasteners — a practical advantage in weight-sensitive builds like PC cases and portable enclosures.
  • 🛡️Anodized Surface for Durability — The anodized finish is integrated into the aluminum surface, offering better scratch and corrosion resistance than painted coatings under normal indoor use conditions.
  • 📦Flexible Pack Quantities — Available in 1, 4, 10, 20, 50, and 100-piece packs so you can order exactly what you need — from a single replacement to workshop bulk stock of anodized M3 bolts.
  • 📐Consistent M3×20mm Dimensions — Standardized M3 thread diameter and 20mm (≈0.79") length ensure predictable fit across enclosures, panels, and frames designed for metric fasteners.

📐 Technical Specifications — M3 Anodized Aluminum Thumb Screws

Thread Standard M3 Metric (ISO 68-1)
Thread Diameter M3 (3mm / ≈0.118")
Screw Length 20mm (≈25/32" / 0.79")
Head Style Flat / Low-Profile Knurled Head
Drive Style Hand-grip (no tool required)
Material Aluminum Alloy
Surface Finish Anodized (color-integrated)
Available Colors Red Wine, Pink, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Brown & Orange
Pack Quantities 1 / 4 / 10 / 20 / 50 / 100 pcs
Thread Pitch See variant options / Contact us to confirm
Head Diameter See variant options
Country of Origin See variant options
⚠️ Note: Thread pitch and exact head diameter are not listed on the packaging. If your application requires confirmed tolerances, please contact us before ordering.

❓ Frequently Asked Questions

What length is M3×20mm and how do I know if it fits my application?

20mm is approximately 25/32" (≈0.79"). This length is generally suitable for panels, enclosures, or assemblies where the clamping depth is typically 12–18mm. Measure your through-hole depth and add clearance for the head before ordering. For reference: M3×16mm ≈ 0.63", M3×20mm ≈ 0.79", M3×25mm ≈ 0.98".

How strong are these thumb screws — can they hold under vibration?

Aluminum thumb screws are generally intended for light-duty, tool-free fastening in electronics, enclosures, and hobby builds. They are not rated for high-torque or heavy structural loads. For vibration-prone environments, consider adding a nylon lock nut or a small amount of thread-locking compound to prevent loosening.

Are these thumb screws suitable for outdoor or wet environments?

The anodized aluminum finish provides a layer of corrosion resistance suitable for light moisture exposure and most indoor conditions. For prolonged outdoor, marine, or high-humidity use, stainless steel fasteners are typically recommended. The anodized coating helps protect the color and surface under normal semi-outdoor conditions.

What thread standard do these use — are they compatible with standard M3 nuts and inserts?

These screws use the standard M3 metric thread (ISO 68-1). They are generally compatible with M3 nuts, threaded inserts, and tapped holes following the metric standard. Always verify thread pitch with your mating component before final assembly, especially in precision applications.

Will the anodized color chip or fade over time?

Anodized finishes are integrated into the aluminum surface rather than applied as a top coat, so they are generally more durable than paint. Under normal indoor use, the color typically remains stable. Prolonged exposure to harsh chemicals, strong UV, or abrasive contact may cause gradual wear over time.

How many pieces should I order for a typical PC build or electronics enclosure project?

For a standard PC case or small electronics enclosure, 4–10 screws are typically sufficient per panel. We offer packs of 1, 4, 10, 20, 50, and 100 pieces. The 10-pack is a popular choice for single projects, while the 50- or 100-pack suits workshops or repeat builds where you stock multiple colors of anodized M3 bolts.

Can I use these without any tools?

Yes. The knurled flat head is specifically designed for finger-tightening without tools. The textured grip pattern allows sufficient torque for most light-duty panel and enclosure applications. If you need a tighter hold, a coin or flat-head screwdriver can be used on the head edge in most cases.

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

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