Fasteners
Bolts
Hillman
$5-$25 per packCarriage Bolts for Clean, Tamper-Resistant Connections
Carriage bolts feature a smooth dome head with a square shoulder that pulls into wood to prevent spinning. This creates a clean, snag-free surface on the visible side while the nut and washer secure from the back for safe, attractive connections.
Key Features
- Smooth dome head for snag-free surface
- Square shoulder prevents spinning
- Tamper-resistant design
- Galvanized and stainless options
- Through-bolt strength
Specifications
Material: Carbon steel
galvanized
or stainless | Head: Smooth dome | Shoulder: Square neck | Diameters: 1/4in to 1/2in | Lengths: 1in to 12in
Best For
Deck railings
Fence post connections
Playground structures
Pergola assembly
Compatible Materials
Dimensional lumber
Pressure-treated lumber
Cedar
Timbers
Metal plates
Pros & Cons
Pros
- ✓ Smooth head is safe and clean-looking
- ✓ Anti-spin square shoulder
- ✓ Through-bolt maximum strength
- ✓ Tamper-resistant from front side
Cons
- ✗ Require through-hole and both-side access
- ✗ Nut and washer required
- ✗ Slower than screws
Installation Tips
Drill a hole matching bolt diameter through all pieces. Insert from the finished side, add washer and nut on back, tighten until square shoulder seats into wood.