Lag Screws
Lag Screws are externally threaded fasteners used to make strong, serviceable connections in metal, wood, and machinery. When the local shelf only has close-enough, working from a stocked distributor lets you pin down the right diameter, length, grade, and finish. South Coast Fasteners stocks Lag Screws in a full range of sizes, grades, and finishes, with fast 3-5 day shipping. Popular options include eye lag screws, structural lag screws, and hex head lag screws.
Materials and Finishes
Lag Screws run from general-purpose carbon steel up to high-strength alloy and stainless, finished anywhere from plain and zinc to hot-dip galvanized for wet or outdoor work. Pair them with metric lag screws, environmental, and Finished Hex Nuts to round out the assembly.
How to Choose
Match the grade to the working load and the finish to the environment after locking in diameter, thread pitch, and length. Harsh or corrosive settings call for alloy or stainless.
Lag Screws Industry Applications
Lag Screws earn a place in shops, on jobsites, and on production floors. Furniture and manufacturing drive them into framing, ledgers, and timber, while automotive and marine & offshore use them to fasten decking, fencing, and posts. Coarse lag thread and a gimlet point hold in structural lumber without a separate anchor.
Frequently Asked Questions
What is a lag screw?
A lag screw, also called a lag bolt, is a heavy hex-head fastener with coarse, sharp threads and a gimlet point that drives directly into wood or into masonry anchors. It carries far more load than an ordinary wood screw.
What size pilot hole for 1/4 lag screw?
Pilot size depends on the lag diameter and the wood: drill close to the lag root diameter in softwood and slightly larger in hardwood to prevent splitting. See the conversion chart for drill sizes by diameter.
What materials and finishes are lag screws available in?
Lag Screws run from general-purpose carbon steel up to high-strength alloy and stainless, finished anywhere from plain and zinc to hot-dip galvanized for wet or outdoor work. Common options include eye lag screws and structural lag screws.
Can I order in bulk or request a quote?
Yes. Stock covers small orders and full production runs. Reach out for a quote or product help.
Why Choose South Coast Fasteners?
Beyond fasteners, we carry PPE, hand tools, cutting tools, abrasives, and industrial supplies, all stocked at competitive prices and backed by fast shipping and people who know the products. We also stock Flat Washers.