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Whether you're rigging boat accessories, assembling outdoor furniture, or tackling a DIY project where tool access is limited, these A4 marine-grade 316 stainless steel wing bolts provide the perfect blend of corrosion resistance and convenience. Designed with large, easy‑to‑grip wings, they allow you to fasten and unfasten by hand – no wrench required. Unlike standard steel fasteners that rust after one rainy season, the 316 stainless body holds up against saltwater, chlorinated pools, humidity, and harsh weather. Available in the most common metric sizes (M4, M5, M6, and M8), they are a go‑to choice for boat owners, mechanics, woodworkers, and anyone who needs a secure, quickly adjustable connection that won’t degrade over time.
| Size | Thread Pitch | Typical Lengths (Variant Selection) | Material |
|---|---|---|---|
| M4 | 0.7 mm | 6 mm, 8 mm, 10 mm, 16 mm, 20 mm | A4 316 Stainless |
| M5 | 0.8 mm | 8 mm, 10 mm, 16 mm, 20 mm, 25 mm | A4 316 Stainless |
| M6 | 1.0 mm | 10 mm, 16 mm, 20 mm, 25 mm, 30 mm | A4 316 Stainless |
| M8 | 1.25 mm | 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 40 mm | A4 316 Stainless |
⚡ Length refers to the threaded portion below the wing head. Please select your required size and length from the dropdown menu above.
“A4” is the metric designation for stainless steel that contains molybdenum, which dramatically improves resistance to chlorides like seawater. “316” is the American equivalent. This grade is the standard for marine hardware, chemical plants, and outdoor structures exposed to salt, humidity, or aggressive cleaning chemicals. You can trust these bolts in environments where normal 304 stainless would start to show rust spots.
No tools are required by design. The winged head gives you enough leverage to tighten or loosen the bolt with just your fingers. This is especially useful for panels that need frequent access, camera mounts, or boat drain plugs. If you need extra torque for a high‑vibration application, you can still use pliers on the wings, but hand-tightening is sufficient for most uses.
316 stainless offers exceptional resistance and is widely considered the best practical choice for marine use. While no metal is 100% immune to corrosion forever, these bolts will resist red rust and pitting far longer than 304 or zinc‑plated steel. For submersion, occasional rinsing with fresh water will extend their life even further. They have been successfully used on sailboats, docks, and beachfront homes for years.
Start by identifying the thread diameter and pitch of the nut or tapped hole you’re fastening into. The most reliable method is to take an existing bolt to the hardware store and match it on a thread gauge. If you’re starting fresh, M4 works for light brackets and electronics, M5‑M6 for furniture and machinery covers, and M8 for heavier hold‑downs. Remember that wing bolts need enough finger clearance – avoid placing them in deeply recessed holes where you can’t grip the wings.
Yes, but you’ll need a compatible threaded insert or T‑nut designed for your material. Screwing them directly into soft wood or plastic can strip the threads. For plastic enclosures, consider heat‑set brass inserts. For wood, use threaded steel inserts or T‑nuts on the back side. The 316 stainless bolt itself will not react with treated lumber or plastics.
