1/4" - 20 Knurled Thumb Screws – Aluminum High - Type Hand Grip Knob Bolt, L= 45–100mm, 10 Colors - HomeDIYer

Roll over image to zoom in Click on image to zoom

1/4"-20 Knurled Thumb Screws – Aluminum High-Type Hand Grip Knob Bolt, L= 45–100mm, 10 Colors

HomeDIYer

No reviews

By HomeDIYer®

Screw Size (Excluding Head): 1/4-20UNC x 45mm

Colour: Royal blue

Pack Quantity: 1Pcs

Price:

$2.92 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

Share this product

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

DIY Expert Support

Get fitment advice & recommendations

Mon–Fri 8:30 AM – 8:00 PM

WhatsApp Email Us

24-Hour Fast Ship

Arrives in 3–14 Days

Worldwide Shipping

30-Day Returns

1 tree planted with every purchase

1/4"-20 Knurled Thumb Screws — Tool-Free Aluminum Fasteners for DIY, Electronics & Machinery

If you've ever struggled to tighten or loosen a fastener in a tight space without a screwdriver, you know how frustrating it can be. Makers, hobbyists, lab technicians, and machine operators who need quick, repeatable access to panels, enclosures, and fixtures rely on 1/4"-20 knurled thumb screws to get the job done by hand — cleanly and efficiently.

Each screw is machined from aluminum alloy with a fully knurled high-type head for a secure finger grip. The 1/4"-20 UNC thread is one of the most common inch-series standards in North America. Lengths run from 45mm (≈1-3/4") to 100mm (≈3-15/16") in 5mm increments, available in 10 anodized colors — Royal Blue, Green, Golden, Dark Red, Black, Silver, Purple, Rose Red, Sky Blue, and Orange. Sold in 1Pcs or 2Pcs packs.

Typical use cases include securing electronics enclosure panels for quick access, fastening 3D printer frames and CNC jig fixtures, and assembling laboratory or workshop equipment where tool-free adjustments are needed throughout the day.

🔩 Thread Compatibility: 1/4"-20 UNC — fits standard 1/4"-20 nuts, T-nuts, threaded inserts, and tapped holes commonly found in US-market hardware and electronics enclosures.

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

✋High-Type Knurled Head — The taller head profile gives your fingers more surface area to grip, making hand-tightening easier even in confined spaces or when wearing gloves.
🔩1/4"-20 UNC Thread — One of the most widely used inch-series coarse thread standards in North America, compatible with a broad range of off-the-shelf nuts and threaded inserts.
⚖️Lightweight Aluminum Construction — Aluminum alloy keeps weight low without sacrificing the rigidity needed for repeated hand-tightening cycles in DIY and light industrial applications.
📏12 Length Options (45–100mm) — Available in 5mm increments from 45mm (≈1-3/4") to 100mm (≈3-15/16"), so you can match the screw length precisely to your material stack-up.
🎨10 Anodized Color Options — Color-code your fasteners by function, panel, or assembly stage. Anodizing also adds a layer of surface protection against minor abrasion.
📦Flexible Pack Quantities — Choose 1Pcs for a single replacement or 2Pcs for paired mounting points, keeping your order lean and your parts bin organized.

📐 Technical Specifications — 1/4"-20 Aluminum Thumb Screws

Thread Standard	1/4"-20 UNC (Unified National Coarse)
Head Style	High-Type Knurled (tall profile for hand grip)
Material	Aluminum alloy
Surface Finish	Anodized (color options available)
Available Lengths (Excluding Head)	45mm (≈1-3/4"), 50mm (≈2"), 55mm (≈2-3/16"), 60mm (≈2-3/8"), 65mm (≈2-9/16"), 70mm (≈2-3/4"), 75mm (≈2-15/16"), 80mm (≈3-1/8"), 85mm (≈3-3/8"), 90mm (≈3-9/16"), 95mm (≈3-3/4"), 100mm (≈3-15/16")
Available Colors	Royal Blue, Green, Golden, Dark Red, Black, Silver, Purple, Rose Red, Sky Blue, Orange
Pack Quantity	1Pcs or 2Pcs (select above)
Head Diameter	See variant options
Head Height	See variant options
Drive Type	Hand-tightened (no tool required)
Recommended Use	Light-to-medium clamping; panels, enclosures, jigs, fixtures

⚠️ Heads up: Head diameter and height dimensions vary by variant. If your application has tight clearance requirements, contact us to confirm exact head dimensions before ordering.

❓ Frequently Asked Questions

How do I choose the right length for my application?

Measure the total thickness of the material you need to clamp or fasten, then add the depth of the threaded hole or nut. For example, if your panel is 10mm (≈3/8") thick and your nut is 8mm deep, choose a length of at least 18mm — so a 45mm screw gives you plenty of grip. Available lengths run from 45mm (≈1-3/4") to 100mm (≈3-15/16") in 5mm increments.

What thread standard do these thumb screws use?

These screws use the 1/4"-20 UNC (Unified National Coarse) thread standard, which is one of the most common inch-series thread sizes in the US. They are generally compatible with standard 1/4"-20 nuts, inserts, and threaded holes found in electronics enclosures, machinery panels, and DIY fixtures.

Are these thumb screws suitable for outdoor or corrosive environments?

These screws are made from aluminum, which offers natural corrosion resistance in most indoor and light outdoor conditions. For prolonged exposure to moisture, salt spray, or harsh chemicals, additional protective measures — such as a sealant or stainless steel alternatives — are generally recommended.

How much clamping force can these thumb screws handle?

Aluminum thumb screws are typically used for light-to-medium clamping loads where tool-free hand tightening is sufficient. They are not intended for high-torque structural applications. For heavy-load fastening, a steel thumb screw or a tool-tightened bolt is generally recommended.

Can I use these with standard 1/4"-20 nuts and threaded inserts?

Yes. The 1/4"-20 UNC thread is a widely adopted standard in North America. These screws are generally compatible with off-the-shelf 1/4"-20 hex nuts, wing nuts, T-nuts, and threaded inserts. Always verify thread pitch before assembly.

What is the difference between the 1Pcs and 2Pcs pack options?

The 1Pcs option includes a single thumb screw, ideal for replacement or single-point fastening. The 2Pcs option includes two screws of the same size and color, suited for paired mounting points or when you need a spare. Both options are priced per pack.

What does 'High Type' mean for thumb screws?

'High Type' refers to the taller knurled head profile compared to standard or low-profile thumb screws. The taller head provides more surface area for your fingers to grip, making it easier to apply torque by hand — especially useful in tight spaces or when wearing gloves.

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