🛠️ Whether you’re assembling flat-pack furniture, fine-tuning a woodworking jig, or replacing corroded hardware on a boat trailer, these A4 stainless steel wing butterfly nuts bring speed and convenience to every job. The wing design lets you tighten or loosen entirely by hand — no wrenches, no drivers — slashing adjustment time on fixtures that need frequent repositioning. Crafted from true marine-grade A4 (316) stainless, they shrug off rust, pitting, and staining in coastal, outdoor, and high-moisture environments. If you’re a DIYer, metalworker, mechanic, or maintenance pro looking for a reliable metric hand-tighten fastener that covers everything from M6 to M20, this set has you covered.
🔩 A4 Stainless Steel Wing Nut Features
- ✅ Authentic A4 (316) Stainless Steel: Delivers far superior corrosion resistance than standard 304 — ideal for saltwater, chemical exposure, and year-round outdoor use.
- ✅ Tool-Free Hand Operation: Butterfly wings provide an ergonomic grip for quick finger-tightening and loosening. Great for jigs, clamps, inspection panels, and temporary fixtures.
- ✅ Full Metric Size Range: Includes M6, M8, M10, M12, M14, M16, and M20 to match the most common metric bolts, threaded rod, and furniture hardware.
- ✅ Standard Coarse Thread Pitch: Fits everyday metric coarse bolts — just match the diameter and thread, and they spin right on.
- ✅ Versatile Across Projects: Woodworking assembly, 3D printer builds, solar panel brackets, gym equipment, automotive brackets, marine canvas fasteners, and hundreds of DIY fixes.
- ✅ Clean, Burr‑Free Finish: Smooth edges and a bright polished surface that won’t snag clothing or scratch workpieces.
📏 Metric Butterfly Nut Specifications
| Size |
Thread Pitch |
Wing Span (approx.) |
Total Height (approx.) |
| M6 |
1.0 mm |
30 mm |
14 mm |
| M8 |
1.25 mm |
35 mm |
17 mm |
| M10 |
1.5 mm |
42 mm |
21 mm |
| M12 |
1.75 mm |
50 mm |
25 mm |
| M14 |
2.0 mm |
57 mm |
28 mm |
| M16 |
2.0 mm |
63 mm |
33 mm |
| M20 |
2.5 mm |
75 mm |
40 mm |
* Dimensions are approximate and may vary slightly between batches. All measurements in millimeters.
❓ A4 Wing Nut FAQ
🔹 Is this truly marine-grade A4 stainless, and how does it compare to A2 (304)?
Yes. A4 stainless steel contains molybdenum, which gives it much stronger resistance to saltwater, chlorides, and industrial chemicals compared to A2 (304). These wing nuts are suitable for boats, docks, coastal fencing, and other harsh environments where standard stainless steel would eventually rust.
🔹 Will these fit standard metric bolts from a hardware store?
Absolutely. They are manufactured to standard metric coarse thread specifications (e.g., M8 x 1.25, M10 x 1.5). As long as your bolt or threaded rod matches the size and pitch listed in the table, it will thread on smoothly.
🔹 Can I tighten them with pliers if I need extra holding force?
They are designed primarily for hand tightening, but you can carefully use pliers on the wings if a bit more torque is needed. Avoid extreme force, as it may bend the wings. For high‑vibration or critical structural joints, a hex nut with a wrench is the safer choice.
🔹 Do these come with matching bolts or washers?
No, this listing includes wing nuts only. Bolts, screws, and washers are sold separately. If you need compatible A4 stainless bolts, please browse our store or contact us — we carry a full range of metric fasteners.
🔹 What is the overall height? I have limited clearance.
The total height ranges from about 14 mm for the M6 up to 40 mm for the M20. Please check the specification table above to make sure the wing nut fits within your available space before ordering.
⚙️ Stock up on these corrosion‑resistant metric butterfly nuts and keep your workshop, job site, or garage project moving without hunting for a wrench.
