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home > #6-32 UNC Knurled Thumb Screws – Aluminium, Anodized Colors, 4–20mm > #6-32 UNC Knurled Thumb Screws – Aluminium, Anodized Colors, 4–20mm

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#6-32 UNC Knurled Thumb Screws – Aluminium, Anodized Colors, 4–20mm#6 32 UNC Knurled Thumb Screws Tool Free Fastening in 10 Anodized Colors If you've ever fumbled for a screwdriver to adjust a panel, secure an enclosure lid, or swap out a component on your RC build, you know how frustrating it is. These #6 32 UNC knurled thumb screws are designed for makers, electronics hobbyists, and DIYers who need fast, repeatable, hand tightened fastening without reaching for a tool every time. Each screw is machined from

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#6-32 UNC Knurled Thumb Screws — Tool-Free Fastening in 10 Anodized Colors

If you've ever fumbled for a screwdriver to adjust a panel, secure an enclosure lid, or swap out a component on your RC build, you know how frustrating it is. These #6-32 UNC knurled thumb screws are designed for makers, electronics hobbyists, and DIYers who need fast, repeatable, hand-tightened fastening without reaching for a tool every time.

Each screw is machined from lightweight aluminium with a deeply knurled cylindrical head for a secure finger grip. Available in lengths from 4mm (≈5/32") to 20mm (≈25/32"), with a standard #6-32 UNC thread. Choose from 10 anodized colors — Royal Blue, Green, Golden, Dark Red, Black, Silver, Purple, Rose Red, Sky Blue, and Orange — sold individually (1 pc) or in value packs (4 pcs).

Typical use cases include securing computer case panels and server rack accessories, fastening 3D printer enclosures and electronics project boxes, and assembling RC car bodies, drone frames, and robotics components where frequent access is needed.

🔩 Thread Compatibility: Standard #6-32 UNC — fits any #6-32 nut, threaded insert, standoff, or tapped hole.

⚠️ Heads up: Screw length is measured excluding the head. Please verify your required grip length before ordering. If you need help confirming fit, contact us.

✅ Key Features of These #6-32 UNC Knurled Thumb Screws

✋Deep Knurled Grip — The cylindrical knurled head provides reliable finger traction for tool-free hand tightening, even in awkward positions or with slightly damp hands.
🪶Lightweight Aluminium Construction — Machined aluminium keeps weight low — a practical advantage for weight-sensitive builds like drone frames, RC bodies, and portable electronics enclosures.
🎨10 Anodized Color Options — The anodized finish adds a layer of corrosion resistance while letting you color-code panels, match your build's aesthetic, or simply make fasteners easier to identify at a glance.
📏Wide Length Range (4–20mm) — Twelve length options from 4mm (≈5/32") to 20mm (≈25/32") cover thin PCB standoffs through thicker panel assemblies, reducing the need to stock multiple fastener types.
🔗Standard #6-32 UNC Thread — Fully compatible with the most common inch-series coarse thread standard used in US electronics and hobby hardware, so these drop right into existing builds without adapters.
📦Flexible Pack Sizes — Available as single pieces for prototyping or in 4-packs for production runs and repeat builds, so you only buy what you need.

📐 Technical Specifications — #6-32 UNC Knurled Thumb Screws

Material	Aluminium (anodized)
Thread Standard	#6-32 UNC (Unified National Coarse)
Thread Diameter	#6 (≈3.5mm / 0.138")
Thread Pitch	32 TPI (threads per inch)
Shank Length (excl. head)	4mm (≈5/32"), 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm (≈25/32")
Head Style	Knurled cylindrical (hand-grip knob)
Head Dimensions	See variant options / Contact us to confirm
Available Colors	Royal Blue, Green, Golden, Dark Red, Black, Silver, Purple, Rose Red, Sky Blue, Orange
Pack Options	1 pc / 4 pcs
Finish	Anodized (color-matched per variant)
Recommended Use	Hand-tightened, light-duty fastening; not for high-torque structural applications

❓ Frequently Asked Questions

How do I choose the right length for my application?

Measure the total material thickness you need to clamp, then select a length that allows the screw to engage at least 2–3 full thread pitches into the receiving nut or threaded insert. For reference, 4mm ≈ 5/32" and 20mm ≈ 25/32". When in doubt, size up — you can always add a washer to take up extra length. Note that the listed length is the shank length excluding the head.

What thread standard do these thumb screws use?

These screws use the #6-32 UNC (Unified National Coarse) thread standard — one of the most common inch-series thread sizes in the US. They are compatible with any standard #6-32 nut, threaded insert, standoff, or tapped hole.

How strong are aluminium thumb screws compared to steel?

Aluminium thumb screws are generally suited for light-duty, hand-tightened applications. They are not intended for high-torque or structural load-bearing use. For applications requiring higher clamping force, a steel thumb screw would typically be more appropriate. These are ideal for panels, enclosures, and components that need frequent removal.

Can these be used outdoors or in humid environments?

The anodized finish provides a degree of corrosion resistance, making these screws generally suitable for light outdoor or humid-environment use. However, they are not rated for prolonged saltwater or highly corrosive chemical exposure. For harsh outdoor conditions, stainless steel fasteners are typically recommended.

Are these compatible with standard #6-32 hardware I already own?

Yes. These thumb screws follow the standard #6-32 UNC thread specification and will mate with any #6-32 nut, threaded standoff, or tapped hole that meets that standard — including most PC case hardware, electronics enclosures, and hobby robotics components sold in the US.

What is the knurled head diameter, and will it fit in tight spaces?

The knurled head diameter is typically larger than the thread diameter to allow finger grip — exact head dimensions vary by length variant. If clearance is a concern in your build, please contact us to confirm head dimensions before ordering.

Do the anodized colors affect thread fit or dimensions?

No. The anodizing process adds only a very thin oxide layer (typically a few microns) that does not meaningfully affect thread dimensions or fit. All color variants share the same thread specification and will fit standard #6-32 hardware interchangeably.

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

#6-32 UNC Knurled Thumb Screws – Aluminium, Anodized Colors, 4–20mm

Name: #6-32 UNC Knurled Thumb Screws – Aluminium, Anodized Colors, 4–20mm
Brand: www.midwoodautocraft.com
SKU: 89838309265
Price: 178.50 USD
Availability: InStock
Rating: 4.2079 (757 reviews)