Lag Bolt vs. Structural Screw
Structural screws were engineered to replace lag bolts in many connections. The choice usually comes down to code approval, speed, and cost.
| Feature | Lag Bolt | Structural Screw |
|---|---|---|
| Pilot hole needed | Yes (avoids splitting wood) | Usually no (self-drilling tip) |
| Shear strength | Good | Higher per diameter |
| Installation speed | Slower (drill then drive) | Fast with an impact driver |
| Code acceptance | Long history, universally accepted | Via ICC-ES evaluation reports |
| Cost | Cheaper per piece | Pricier per piece |
Verdict
For new structural work, structural screws are faster and stronger, but always check the evaluation report. Lag bolts remain a proven, cheaper choice where speed does not matter.