Heavy Duty 304 Stainless Steel Carriage Bolts M6x20mm 20 Pack Solid Round Head Square Neck Hardware Built Tough For Straight Up Hassle Free Deck Building And No Nonsense Pro Grade Woodworking Projects

Premium M6 Stainless Steel Carriage Bolts for Reliable Use
✔️ M6 x 20mm 304 Stainless Steel Square Neck Heads 20 Pack

These heavy duty carriage fasteners feature a round top head and a square shank that locks into wood or metal to stop spinning during installation. They are primarily used for deck framing, outdoor furniture assembly, marine railings, and general structural joinery where reliable clamping force is required.

✅ Material composition is grade 304 stainless steel for rust resistance
✅ Overall length measures 20mm / 0.79in with a 16mm / 0.63in threaded grip zone
✅ Head diameter sits at 16mm / 0.63in while neck width matches the 6mm / 0.24in thread base
✅ Pitch runs at 1mm / 0.04in per revolution for smooth engagement and steady pull

💡 How does a square shank interface with solid materials to prevent rotational slip when high torque is applied?

This specific geometry bites into the workpiece instantly so you can get the fastener seated without needing a counter wrench, which makes the whole process real handy. The engineering behind this setup delivers these practical benefits:
- The flat square profile wedges tightly into pilot holes to lock angular position
- Precision rolled threads ensure consistent pitch contact for maximum clamp load retention
- Passive corrosion barrier stops electrochemical degradation during extended outdoor service