UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer
UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer
UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer
UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer
UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer
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UNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYerUNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYerUNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYerUNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYerUNC 1/4 - 20 Aluminum Knurled Flat Thumb Screws – Low - Profile Hand Grip Bolts 3/8" (10mm) - HomeDIYer

UNC 1/4-20 Aluminum Knurled Flat Thumb Screws – Low-Profile Hand Grip Bolts 3/8" (10mm)

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Price:
$8.27 USD
Stock:
In stock (500 units), ready to be shipped

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Description

 

UNC 1/4-20 Flat Knurled Thumb Screws — Low-Profile Hand Tightening for Tight-Clearance Builds

When a standard tall knob won’t fit — inside an enclosure, under a sliding panel, or flush against a jig surface — makers, woodworkers, and electronics builders need a flat knurled thumb screw that stays out of the way without sacrificing grip. These UNC 1/4-20 flat thumb screws are designed exactly for those tight-clearance situations where a low-profile fastener is the only option that works.

Each screw features a UNC 1/4-20 thread (1/4" diameter, 20 threads per inch) machined from aluminum alloy with a flat, knurled head for hand tightening without tools. Currently available in one length: 3/8" (10mm). Choose from 10 anodized colors — Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Orange — and order in packs of 2, 5, 10, 15, 20, or 25 pieces to match your project scale.

Typical use cases include electronics enclosure panel fastening, 3D printer frame covers, woodworking jig clamping plates, CNC fixture hold-downs with limited vertical clearance, and router table inserts — anywhere a low-profile 1/4-20 flat thumb screw needs to be tightened and released by hand repeatedly without a tool.

🔩 Thread Compatibility: UNC (Unified National Coarse) 1/4-20 — fits any standard 1/4-20 nut, threaded insert, or tapped hole. Confirm your application uses UNC threading before ordering.

✅ Key Features of These 1/4-20 Flat Knurled Thumb Screws

  • 📏Low-Profile Flat Head Design — The flat knurled head keeps the fastener close to the surface, making these 1/4-20 flat thumb screws ideal for tight-clearance enclosures, sliding panels, and flush-mount jig applications where a tall knob would interfere.
  • ✋Knurled Grip for Tool-Free Tightening — The knurled pattern on the flat head provides enough friction for reliable hand tightening and loosening, even with slightly oily or gloved hands — no screwdriver or wrench needed.
  • 🔩UNC 1/4-20 Standard Thread — One of the most widely used thread standards in the US, compatible with standard nuts, threaded inserts, and tapped holes across woodworking, fabrication, and electronics applications.
  • ⚡Lightweight Aluminum Alloy Body — Aluminum alloy keeps weight low without sacrificing the rigidity needed for hand-tightened clamping in jigs, enclosures, and DIY assemblies — a practical choice over heavier steel in weight-sensitive builds.
  • 🎨10 Anodized Color Options — Color-code fasteners by zone, axis, or function across your build. All 10 colors — Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange — share the same aluminum alloy material and thread dimensions.
  • 📦Flexible Pack Sizes — Available in 2, 5, 10, 15, 20, or 25-piece packs so you can grab just what you need for a single repair or stock up for a full build without overpaying per piece.

📐 Technical Specifications — UNC 1/4-20 Flat Knurled Thumb Screws

Thread Standard UNC (Unified National Coarse)
Thread Size 1/4-20 (1/4" diameter, 20 TPI)
Length 3/8" (10mm)
Head Style Flat knurled (low-profile)
Material Aluminum alloy
Finish / Color Anodized — Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange
Drive Method Hand-tightened (tool-free)
Quantity per Pack 2 / 5 / 10 / 15 / 20 / 25 pcs (see variant options)
Recommended Torque Hand torque only — not for high-load structural use
Corrosion Resistance Moderate (aluminum alloy); contact us to confirm for outdoor use
Country of Origin See variant options
⚠️ Clearance Note: This listing is currently available in 3/8" (10mm) length only. If you need a longer length for thicker panels or deeper thread engagement, contact us before ordering.

❓ Frequently Asked Questions

Is 3/8" (10mm) the only length available, and how do I know if it fits my application?

Currently this listing offers the 1/4-20 flat thumb screw in 3/8" (10mm) length. To confirm fit, measure your panel or fixture thickness and ensure the screw provides at least 1.5× its diameter in thread engagement — for 1/4-20 that is typically a minimum of 3/8" thread engagement. If your stack is thicker, contact us to ask about other available lengths.

How strong are aluminum flat thumb screws for clamping?

Aluminum alloy flat thumb screws are generally suited for light-to-medium hand-tightened clamping loads in jigs, fixtures, enclosures, and DIY assemblies. They are not intended for high-torque or structural load-bearing applications where steel fasteners are typically required.

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

Aluminum alloy has natural corrosion resistance, making these screws generally suitable for light outdoor or humid-environment use. For prolonged salt-spray or fully submerged conditions, stainless steel fasteners are typically recommended. Contact us to confirm suitability for your specific environment.

What thread standard do these use — will they fit standard nuts and threaded inserts?

These use UNC (Unified National Coarse) 1/4-20 threading — 1/4" diameter, 20 threads per inch. They are compatible with any standard UNC 1/4-20 nut, threaded insert, or tapped hole. This is one of the most common thread standards in the US, widely used in woodworking jigs, electronics enclosures, and general fabrication.

When should I choose a flat (low-profile) thumb screw over a high-type knob?

Choose a flat (low-profile) thumb screw when vertical clearance is limited — for example, inside enclosures, under sliding panels, or in tight jig setups where a tall knob would interfere. The flat knurled head still provides enough grip for hand tightening while keeping the profile minimal. If you need more torque leverage and have clearance, a high-type knob is generally easier to tighten.

Do the colors affect the material or thread dimensions?

No — all color variants are made from the same aluminum alloy material. The colors (Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange) are anodized or coated surface finishes. They do not affect thread dimensions or mechanical performance and are primarily used for visual identification or color-coding.

Can I use these in 3D printer or electronics enclosure builds?

Yes — the low-profile flat head makes these 1/4-20 thumb screws well-suited for 3D printer enclosure panels, electronics chassis covers, and any application where a flush or near-flush fastener is needed. Confirm your application uses UNC 1/4-20 threading before ordering.

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

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