🔩 Fasteners & Hardware | Wing Bolts
🦋 Premium Stainless Butterfly Wing Bolts – M3 to M12 | Thumb Screws for Rapid Assembly
Struggling with tight spaces or frequent adjustments? Our 201/304/316 Stainless Steel Butterfly Wing Bolts (also known as thumb screws or wing screws) eliminate the need for wrenches or hex keys. Whether you're securing access panels, mounting equipment on a workbench, repairing farm machinery, or building marine fixtures – these hand‑tightenable fasteners cut downtime to seconds. Choose between three stainless grades (201, 304, 316) to match your environment, from indoor DIY projects to corrosive coastal or chemical-heavy applications. Perfect for mechanics, maintenance pros, makers, and home hobbyists who value efficiency, corrosion resistance, and professional-grade grip.
✨ Key Features of Our 201/304/316 Stainless Wing Thumb Screws
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🛡️ Triple-Grade Stainless Steel – Available in 201 (economy), 304 (rust-resistant general use), and 316 (marine-grade, saltwater proof).
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🔧 Tool‑Free Fastening – Ergonomic butterfly wings provide high torque by hand; ideal for quick assembly, disassembly, and adjustments.
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📏 Full Metric Range M3 – M12 – Thread sizes M3, M4, M5, M6, M8, M10, M12 to suit electronics, 3D printers, furniture, industrial frames and more.
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🔩 Precision ISO Metric Threads – Coarse thread standard (DIN 315 / similar) ensures reliable engagement with standard nuts or tapped holes.
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🌊 Corrosion & Weather Resistant – 304 grade excellent for humidity & indoor/outdoor; 316 grade withstands salt spray, chemicals, and marine environments.
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⚙️ Versatile Applications – HVAC access doors, control panels, jigs & fixtures, machinery guards, outdoor furniture, automotive trim, DIY workbenches.
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📦 Brand New & Individually Packed – Unused, undamaged, and ready to install. Each batch inspected for thread consistency and finish.
📐 Technical Specifications | Stainless Butterfly Wing Bolts M3–M12
| Material Options |
201 Stainless Steel (economical, mild corrosion resistance)
304 Stainless Steel (superior rust resistance, food/medical safe, ideal)
316 Stainless Steel (marine grade, high acid/salt tolerance) |
| Available Thread Sizes |
M3, M4, M5, M6, M8, M10, M12 (metric coarse thread) |
| Thread Standard |
DIN 315 / ISO 4038 style wing screws – fully compatible with standard metric nuts |
| Head Style |
Butterfly wing / Thumb screw – large rounded grips for hand tightening |
| Overall Length (varies by size) |
M3(12-16mm), M4(16-20mm), M5(20-25mm), M6(25-30mm), M8(30-40mm), M10(40-50mm), M12(50-60mm) – contact for custom lengths |
| Tensile Strength (approx) |
201: 520–720 MPa | 304: 515–720 MPa | 316: 550–620 MPa |
| Hardness (Rockwell) |
HRB ≤ 95 (various grades, fully annealed ductile) |
| Country of Origin |
China (precision engineered, quality control ensured) |
| Condition / Packaging |
Brand new, unused, damage-free – poly bag or bulk per order. No retail clamshell, eco-friendly packaging. |
| Brand / MPN |
Unbranded / MPN: Does not apply (high-quality generic fastener) |
| Custom Bundle |
No – each size & material sold individually / by variant. Bulk pricing available. |
💡 Need a specific size/grade combination? Use the variant selector above to pick your required thread size (M3–M12) and stainless steel type (201/304/316). Mix orders are available via bulk request.
❓ Frequently Asked Questions About Stainless Butterfly Wing Bolts
🔹 1. Are these wing bolts truly rustproof? How do 201, 304, and 316 compare?
Yes – all three grades offer excellent corrosion resistance compared to carbon steel. 201 stainless works for dry indoor applications with occasional moisture. 304 stainless is the industry standard for general outdoor use, humidity, and light chemicals. 316 stainless contains molybdenum, providing superior resistance to saltwater, chlorides, and harsh industrial environments – ideal for marine equipment, coastal fixtures, and chemical plants.
🔹 2. Will these metric wing bolts fit standard US (imperial) nuts or holes?
These are metric coarse thread (M3–M12) and fit metric nuts or tapped metric holes. They are not interchangeable with inch-based (UNC/UNF) threads. We recommend verifying your mating part’s thread pitch (ex: M6 x 1.0). For imperial applications, consider buying matching metric nuts from our fastener collection – quick and reliable fit guaranteed.
🔹 3. Can I use these butterfly screws for high-vibration machinery?
Wing bolts are designed for hand-tightening convenience. While the stainless steel wings provide moderate clamping force, for heavy vibration, we suggest adding a compatible lock washer, thread locker (Loctite), or using a nylon insert nut. However, for quick-release panels, covers, and low-to-medium vibration assemblies, these perform reliably.
🔹 4. Do you offer mixed size kits or bulk packs? How to order specific sizes?
Each size and material grade is listed as a separate variant – you can select the exact Thread size (M3/M4/M5/M6/M8/M10/M12) and SS grade (201/304/316) from the dropdown above the “Add to Cart” button. Bulk quantities (packs of 10, 50, 100) are available via the quantity selector. For mixed sample kits, please contact our support to create a custom listing. No pre-made custom bundle, but we are happy to assist with large projects.
🔹 5. Are the threads clean and burr-free? Quality control process?
Absolutely. All wing bolts go through strict quality inspection: threads are rolled for precision, wings are fully formed without sharp edges, and each batch is visually inspected for burrs or deformation. We guarantee smooth engagement with standard nuts and no internal defects. If you ever receive a faulty piece, our 30‑day hassle-free return policy covers you.
🔹 6. What is the maximum operating temperature for these stainless wing bolts?
All three grades (201/304/316) maintain structural integrity up to roughly 800°F (425°C) for intermittent use. Continuous exposure above 600°F (315°C) may cause gradual oxidation but does not affect manual function. For extreme high-heat applications (ovens, exhaust systems), please consult engineering specs – these are ideal for ambient to moderately high temperature environments.
📦 Shipping & packaging: Each order is carefully packed to avoid thread damage. Because these are unbranded, high-quality fasteners direct from the source, you pay for function and durability – not fancy packaging. New condition guaranteed.
🔧 Ready to upgrade your workflow? Choose your size & material above, and say goodbye to tool-dependent fastening. Perfect for pros and makers alike.
