🦋 Butterfly Wing Bolts Screws Thumb Screws – the no‑tool tightening solution for makers, mechanics, and home DIYers. Whether you’re adjusting a jig on your workbench, securing a bracket in a tight spot, or building 3D printer mods, these A2 stainless steel thumb screws let you tighten and loosen by hand instantly. Forget fumbling for screwdrivers or Allen keys – just pinch the wing head and turn. The 16mm length is ideal for thin panels, electronic enclosures, and light‑duty fixtures where a bulky bolt would get in the way. Available in three popular metric sizes (M4, M5, M6), they solve the everyday headache of hard‑to‑reach fasteners and speed up repetitive assembly tasks.
🔩 Key Features of Our Metric Butterfly Wing Bolts
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👍 Hand‑Tightening Wing Head: The butterfly head design gives you a firm grip for quick finger tightening – no tools required. Perfect for fixtures that need frequent adjustment.
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🌧️ Genuine A2 Stainless Steel: Crafted from A2 (304) stainless steel, these bolts provide excellent corrosion resistance. Ideal for indoor projects, damp basements, or light outdoor use.
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📏 Metric M4 / M5 / M6 Threads: You can choose the exact diameter you need. The 16mm length fits thin materials, brackets, and electronics without protruding excessively.
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✨ Clean, Smooth Threads: Every screw is manufactured with burr‑free threading, ensuring easy installation and a secure hold in your t‑nuts, inserts, or tapped holes.
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🔧 Versatile Utility: Use them as thumb screws for cover plates, woodworking jigs, CNC clamps, camera mounts, or furniture knobs – wherever quick, tool‑free clamping helps.
📋 Stainless Steel Thumb Screws Specifications
| Material |
Stainless Steel A2 (304) |
| Mandrel Material |
Stainless Steel |
| Thread Size Options |
M4, M5, M6 (select at checkout) |
| Length |
16 mm |
| Head Style |
Butterfly / Wing |
| Drive Type |
Thumb (hand‑operated) |
| System of Measurement |
Metric |
| End Type |
Open |
| Product Condition |
New, unopened, undamaged |
| Country of Origin |
China |
❓ Frequently Asked Questions About Butterfly Wing Bolts (No‑Tool Thumb Screws)
🔹 What sizes are included, and can I choose just one?
This listing offers individual sizes: M4, M5, and M6. All are 16mm in length. Simply select your preferred metric diameter from the variation dropdown before adding to cart. You’re not forced to buy a mixed set.
🔹 Are these truly A2 stainless steel? Will they rust?
Yes, they are made of A2 (also known as 304) stainless steel. This grade offers solid corrosion resistance for typical indoor and limited outdoor environments, but like any stainless product, prolonged exposure to harsh chemicals or saltwater may eventually cause surface staining. They are a significant upgrade over zinc‑plated steel.
🔹 Can I use these with wood, plastic, or metal?
Absolutely. They work well in pre‑tapped holes, threaded inserts, or with compatible nuts (nuts not included). For wood, you may want to use a threaded insert or a T‑nut. For plastic and aluminum, they pair nicely with standard metric nuts or tapped threads in jigs and machine parts.
🔹 Do these butterfly bolts come with nuts or washers?
No, this listing is for bolts only. If your project requires nuts, you’ll need to source matching metric nuts separately (M4‑0.7, M5‑0.8, or M6‑1.0 pitch). The bolts will also work with most standard metric nylon lock nuts or wing nuts you might already own.
🔹 Is the butterfly head shaped for a real thumb grip?
Yes, the symmetrical wing design allows for secure two‑finger or thumb‑and‑finger tightening. The edges are smooth and burr‑free, so no sharp spots dig into your skin during hand‑tightening. Most users find they can achieve plenty of tension for light‑duty clamping without any tools.
