Stainless Steel Hex Lag Screws
What are stainless steel hex lag screws? Stainless steel hex lag screws are heavy-duty wood screws with a hex head and coarse threads, driven with a wrench or socket to fasten wood to wood or wood to masonry with an anchor. Made from stainless, they resist rust and treated-lumber corrosion in decks, docks, and outdoor structural connections.
Why lag screws need a pilot hole and stainless
Lag screws are thick and coarse-threaded, so a correctly sized pilot hole is essential to prevent splitting the wood and to avoid snapping the screw, which matters more with stainless since it is softer than hardened steel. Because lags carry real structural load in ledgers, posts, and heavy timber, corrosion at the connection is a safety issue. Stainless resists the moisture and treated-lumber chemicals that rust plated lags and streak the wood. For docks and coastal work, choose 316.
Why choose stainless steel hex lag screws
- Heavy-duty hold: coarse threads grip wood for structural connections.
- Wrench driven: hex head takes a socket or wrench for high torque.
- Corrosion resistance: holds up in wet, treated, and coastal wood.
- Grade options: 18-8 for general use, 316 for docks and coastal work.
Common applications for stainless hex lag screws
- Deck ledgers, posts, and beams
- Docks and waterfront framing
- Heavy timber and fence connections
- Wood to masonry with a lag shield anchor
For fastening lags into masonry, pair them with a stainless lag shield anchor, add flat washers under the heads, and browse every finish on the main hex lag screws category.
Stainless Steel Hex Lag Screws FAQ
Do lag screws need a pilot hole?
Yes. Drill a pilot hole sized to the screw's shank so the threads bite without splitting the wood or snapping the screw, especially in hardwood.
Can lag screws go into concrete or brick?
Not directly. Use a lag shield or masonry anchor sized to the lag, which expands in the hole and accepts the screw threads.
Should I use 18-8 or 316 lag screws?
18-8 suits most outdoor wood. For docks, saltwater, and coastal exposure, choose 316 for the best corrosion resistance.