M3.5 Knurled Thumb Screws — A2 Stainless Steel & Anodized Aluminum, Hand-Turn Knob Bolt

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M3.5 Knurled Thumb Screws — A2 Stainless Steel & Anodized Aluminum, Hand-Turn Knob Bolt

Name: M3.5 Knurled Thumb Screws — A2 Stainless Steel & Anodized Aluminum, Hand-Turn Knob Bolt
Brand: HomeDIYer
Price: 2.24 USD
Availability: InStock

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Thread diameter*Length: M3.5 x 4mm

colour: Royal blue

Amount: 1pcs

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$2.24 USD

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Verfügbar (500 Stück), versandbereit

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M3.5 Knurled Thumb Screws — Tool-Free Fastening with a Secure Grip

If you've ever fumbled for a screwdriver to make a quick panel adjustment on your 3D printer, electronics enclosure, or DIY jig, you know how frustrating it is. These M3.5 knurled thumb screws are built for makers, hobbyists, and engineers who need fast, repeatable, tool-free fastening without sacrificing holding strength.

Each screw features an A2 stainless steel threaded shank paired with an anodized aluminum knurled knob head. Lengths range from 4mm (≈5/32") to 40mm (≈1-9/16"), available in 10 anodized colors — Royal Blue, Green, Gold (Auratus), Wine Red, Black, Silver, Purple, Pink, Sky Blue, and Orange. Sold individually so you can mix and match exactly what your project needs.

Typical applications include 3D printer frame assemblies, camera rig quick-release panels, RC model body mounts, electronics enclosure covers, and laboratory fixture adjustments — anywhere you need a knurled thumb screw M3.5 that can be tightened and loosened by hand in seconds.

🔩 Thread Standard: ISO Metric M3.5 coarse thread — compatible with standard M3.5 threaded holes, inserts, and nuts. Verify pitch before installation.

⚠️ Heads up: These are hand-tightened fasteners. Not intended for high-torque or structural load-bearing joints. If you need a specific thread pitch confirmed, please contact us before ordering.

✅ Key Features of These M3.5 Knurled Thumb Screws

🔩A2 Stainless Steel Shank — The threaded shank is machined from A2 (304) stainless steel, offering solid corrosion resistance and durability for indoor and general outdoor use without rusting under normal conditions.
✋Knurled Aluminum Knob Head — The wide, deeply knurled anodized aluminum head gives your fingers real purchase, so you can apply consistent hand torque without slipping — even with slightly damp hands.
📏22 Length Options (4mm–40mm) — From compact 4mm (≈5/32") panel fasteners to 40mm (≈1-9/16") through-bolts, this range covers the most common M3.5 thumb screw applications without needing custom hardware.
🎨10 Anodized Colors for Visual Organization — Color-code your assemblies by function, axis, or component. The anodized finish is durable and won't chip or peel under normal handling.
⚡Tool-Free Installation and Removal — Designed for frequent adjustments. Ideal for 3D printer enclosures, camera rigs, and RC model body panels where you need hand-turn knob bolts that come on and off quickly.
🛒Sold Individually — Mix and Match — Buy exactly the quantity, length, and color you need. No forced multi-packs. Useful for prototyping, repairs, or replacing a single lost fastener in an existing assembly.

📐 Technical Specifications — M3.5 Knurled Thumb Screw

Thread Diameter	M3.5
Thread Standard	ISO Metric Coarse (typically 0.6mm pitch — contact us to confirm)
Available Lengths	4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm
Shank Material	A2 Stainless Steel (304)
Head Material	Anodized Aluminum
Head Style	Knurled Thumb Knob (hand-turn)
Drive Style	Hand-turn (no tool required)
Available Colors	Royal Blue, Green, Gold (Auratus), Wine Red, Black, Silver, Purple, Pink, Sky Blue, Orange
Quantity per Order	1 piece
Head Diameter	See variant options
Head Height	See variant options
Surface Treatment	Anodized (head) / Passivated (shank)

❓ Frequently Asked Questions

How do I choose the right length for M3.5 thumb screws?

Measure the total thickness of the material you need to clamp or fasten, then add 2–3 thread diameters for adequate engagement. For M3.5 screws, that typically means at least 7–10mm of thread engagement. Available lengths range from 4mm (≈5/32") to 40mm (≈1-9/16"). When in doubt, choose a slightly longer screw and use a nut or threaded insert to control depth.

What is the thread pitch on these M3.5 thumb screws?

M3.5 screws generally follow the ISO metric coarse thread standard with a pitch of 0.6mm. Please contact us to confirm if your application requires a specific pitch.

How strong are these thumb screws?

The threaded shank is made from A2 (304) stainless steel, which typically offers a tensile strength of around 500–700 MPa. These screws are designed for hand-tightened, tool-free applications — not high-torque structural joints. For load-bearing connections, consult a fastener engineer.

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

The A2 stainless steel shank offers good corrosion resistance for general outdoor and damp environments. The anodized aluminum knob head also provides a protective oxide layer. However, for prolonged marine or highly corrosive environments, A4 (316) stainless steel is generally recommended.

Are these compatible with standard M3.5 threaded holes and nuts?

Yes. These screws follow the standard ISO metric M3.5 thread profile and are generally compatible with M3.5 threaded inserts, nuts, and tapped holes. Always verify thread pitch compatibility before installation.

What are the best use cases for these knurled thumb screws?

These thumb screws are well-suited for 3D printer enclosures, electronics enclosures, camera rigs, RC models, DIY jigs, and any application requiring frequent tool-free adjustments. The color-coded anodized heads also make them useful for visual organization in multi-component assemblies.

Do the anodized colors affect the screw's performance?

No. The anodized finish is a surface treatment on the aluminum knob head and does not affect the mechanical performance of the stainless steel threaded shank. Color selection is purely aesthetic and organizational.

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

M3.5 Knurled Thumb Screws — A2 Stainless Steel & Anodized Aluminum, Hand-Turn Knob Bolt

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Beschreibung

M3.5 Knurled Thumb Screws — Tool-Free Fastening with a Secure Grip

✅ Key Features of These M3.5 Knurled Thumb Screws

📐 Technical Specifications — M3.5 Knurled Thumb Screw

❓ Frequently Asked Questions

M3.5 Knurled Thumb Screws — A2 Stainless Steel & Anodized Aluminum, Hand-Turn Knob Bolt

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