1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer
1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer
1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer
1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer
1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer
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1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer1/4 - 20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch - HomeDIYer

1/4-20 Flat Knurled Thumb Screws — Aluminum | 10 Colors | 12.7mm 1/2 Inch

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Price:
$6.94 USD
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In stock (500 units), ready to be shipped

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Description

 

1/4-20 Flat Knurled Thumb Screws for a Flush, Tool-Free Finish — 10 Colors, Aluminum, 12.7mm (1/2")

Standard thumb screws with tall raised heads can stick out awkwardly on a clean build — catching on cables, snagging sleeves, or just looking out of place on a carefully assembled PC case or electronics enclosure. These 1/4-20 flat knurled thumb screws are designed for builders, makers, and DIYers who want the convenience of tool-free fastening without sacrificing a flush, finished look. With 10 color options, they let you match your build's color scheme, color-code access panels, or add a deliberate accent to a custom project.

Each screw is machined from aluminum alloy with a knurled edge for a secure finger grip. The thread size is 1/4-20 UNC (1/4-inch diameter, 20 threads per inch) with a thread length of 12.7mm (1/2"). Available in quantities of 1, 3, 5, 10, 15, or 20 pieces per order — whether you need a single replacement or a full set for a multi-panel build. Colors include Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Orange.

Common applications include securing side panels and access covers on custom PC cases where a flush, color-matched finish is part of the build aesthetic, fastening covers on DIY electronics enclosures and Raspberry Pi project boxes where tool-free removal is a daily convenience, and assembling workshop fixtures or jigs where hand-adjustable 1/4-20 flat thumb screws speed up setup and teardown without reaching for a screwdriver.

🔩 Thread Compatibility: 1/4-20 UNC — fits standard North American tapped holes with 1/4-inch diameter and 20 threads per inch. Verify your hole's thread pitch before ordering.

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

  • 🔧Flush Flat Head Design — The low-profile flat head sits nearly flush with the panel surface when tightened, giving custom PC builds and electronics enclosures a clean, snag-free finish that raised-head thumb screws can't match.
  • 🎨10 Color Options — Choose from Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Orange to match your build's color scheme or color-code access panels for quick identification.
  • ✋Knurled Edge for Tool-Free Grip — The textured knurl pattern around the head gives your fingers solid traction for hand-tightening and loosening, even during repeated access cycles on enclosures and panels.
  • 📦Flexible Pack Sizes: 1 to 20 Pcs — Order 1, 3, 5, 10, 15, or 20 pieces per variant — whether you need a single replacement flat thumb screw or a full set for a multi-panel enclosure build.
  • ⚖️Lightweight Aluminum Construction — Aluminum alloy keeps weight low in weight-sensitive builds while providing adequate strength for panel fastening and light clamping applications.
  • 🔄Designed for Repeated Use — The knurled aluminum head withstands repeated installation and removal cycles without tool wear, making it a reliable choice for panels and covers that need regular opening.

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

Product Type Flat Knurled Thumb Screw (Flush Head)
Head Style Flat / flush knurled head
Thread Size 1/4-20 UNC (1/4-inch diameter, 20 threads per inch)
Thread Standard UNC (Unified National Coarse)
Thread Length 12.7mm (1/2")
Material Aluminum alloy
Available Colors Wine Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange
Drive Type Hand-drive (no tool required)
Available Quantities 1, 3, 5, 10, 15, or 20 pieces per order
Head Diameter See variant options
Corrosion Resistance Moderate (aluminum, oxidation-resistant)
Recommended Use Custom PC cases, electronics enclosures, DIY project boxes, access panels, workshop jigs
Country of Origin Contact us to confirm
⚠️ Sizing Note: Thread length is measured from the underside of the head to the tip of the screw. Ensure your tapped hole depth is at least 12.7mm (1/2") to accommodate the full thread. If unsure, verify fit with a single piece before ordering in quantity.

❓ Frequently Asked Questions

What does the 1/4-20 × 1/2" size mean, and is it right for my project?

1/4-20 means 1/4-inch thread diameter with 20 threads per inch (UNC standard). The 1/2" (12.7mm) refers to the thread length. This is one of the most common thumb screw sizes for PC cases, electronics enclosures, and DIY project boxes in North America. Verify your tapped hole is 1/4-20 UNC before ordering.

What is the load-bearing capacity of these flat thumb screws?

These aluminum flat knurled thumb screws are designed for light-to-medium panel fastening and clamping applications. They are not intended for structural or high-vibration load-bearing use. For heavier-duty applications, contact us to confirm suitability.

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

Aluminum is naturally oxidation-resistant, but these screws are generally not recommended for prolonged exposure to salt spray or highly corrosive environments. For outdoor use in damp conditions, a stainless steel alternative would typically be more suitable.

What thread standard do these screws use?

These screws use the 1/4-20 UNC (Unified National Coarse) thread standard — 1/4-inch diameter with 20 threads per inch. This is the most common thumb screw thread size for North American PC cases, server chassis, and electronics enclosures. Always verify your tapped hole matches 1/4-20 UNC before ordering.

How do I choose the right color for my build?

Color choice is typically aesthetic or functional. Black and Silver blend into most enclosures for a clean look. Bold colors like Wine Red, Royal Blue, Golden, or Orange are popular for custom PC builds and color-coded access panels. Sky Blue, Rose Red, Green, and Purple work well for themed builds or maker projects where visual identity matters.

What is the difference between a flat thumb screw and a knurled thumb screw with a raised head?

A flat (flush) knurled thumb screw sits nearly flush with the surface when tightened, giving a cleaner, lower-profile appearance. A raised-head thumb screw protrudes more, which can make it easier to grip but may not suit builds where a flush finish is desired. These flat knurled screws are ideal when aesthetics and a tidy panel finish are priorities.

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

No tools are required. The knurled edge provides enough grip for hand-tightening and loosening, making these ideal for panels and covers that need frequent access — such as PC side panels, electronics project boxes, and workshop jig covers.

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

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