木结构用方头螺钉（Lag Screws）完整选型指南：建筑专业人士必备

Lag screws have a tapered shank and coarse thread designed for wood, with a hex head requiring a wrench. Structural wood screws (like GRK, SPAX) are newer designs with reamer threads and no pre-drilling required, but are more expensive. For heavy timber connections, lag screws remain the most cost-effective choice.

Yes, for many applications lag screws are a valid alternative to through-bolts. They provide comparable load capacity without requiring access to both sides of the connection. However, for critical structural connections requiring inspection or where the joint may be disassembled, traditional through-bolts with plates are still preferred.

The most common cause is incorrect pilot hole sizing — too small causes high torque and snapping; too large prevents thread engagement. Always pre-drill with the correct bit size for shank and threaded portions. Also ensure the screw is perpendicular to the wood surface; angled installation creates bending stress.