🔩 Heavy-Duty 3/8" x 1-1/2" Stainless Steel Hex Lag Screws – 50-Piece Set
Whether you're building a deck, securing ledger boards, or assembling outdoor furniture, these 3/8" x 1-1/2" hex head lag bolts give you the holding power you need. Made from A2 (304) stainless steel, they resist rust even in humid or coastal environments. The external hex head lets you drive them with a wrench or socket without stripping, and the sharp point bites straight into wood — no pilot hole required for many softwoods. This 50-pack comes in a labeled storage box, so you always have the right fastener at hand.
✨ Why These Hex Head Wood Screws Stand Out
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Marine-grade 304 stainless steel – Excellent corrosion resistance for outdoor decks, fences, and garden projects. Won't leave ugly rust stains.
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External hex drive & self-drilling point – Use a standard socket or wrench for a solid grip. The sharp tip starts easily and reduces splitting in wood.
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Partial thread design – Smooth upper shank allows tight clamping between wood pieces; aggressive 3/8"-16 threads grip deep for pull-out strength.
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50-piece bulk set in a sturdy box – Labeled compartments make it easy to grab the size you need. No more loose screws rattling in a drawer.
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Precision craftsmanship – No off-center heads or weak spots. These lag bolts are straight, high-strength, and built to handle heavy loads.
📐 Technical Specifications
| Product Type |
Wood Screws, Partial Thread (Lag Bolts) |
| Material |
A2 (304) Stainless Steel |
| Head Style |
Hex Head (External Hex) |
| Thread Size |
3/8"-16 (Coarse Thread) |
| Overall Length |
1-1/2 inches |
| Finish |
Raw Stainless Steel / Silver |
| Drive Style |
External Hex – use wrench or socket |
| Grade |
A2 (304 equivalent) |
| Pack Quantity |
50 pieces |
| Packaging |
Plastic storage box with size labels |
| Measurement System |
Inch |
| Country of Origin |
China |
❓ Frequently Asked Questions
Do these 3/8" lag bolts require pre-drilling into wood?
Not always. For softwoods like pine or cedar, the self-drilling point can often start without a pilot hole. However, for hardwoods (oak, maple) or near the edge of a board, we recommend drilling a clearance hole about 1/8" smaller than the screw diameter to avoid splitting. For maximum holding power or precise placement, pre-drilling is always a safe practice.
Are these really 304 stainless steel? Will they rust outdoors?
Yes, they are made from genuine A2 (304) stainless steel. This grade offers very good rust resistance for outdoor use, including rain and humidity. While not as salt-proof as 316 marine grade, these 304 lag screws are perfectly suited for decks, fences, and general exterior wood projects. They will not develop orange rust like regular steel or zinc-coated screws.
What tools do I need to install these hex head lag screws?
You need a wrench (standard 9/16" for 3/8" hex head) or a socket with a ratchet. A hex socket attached to an impact driver works great for faster driving. Do not use a standard Phillips or flathead driver – the external hex design is meant for wrenches or sockets.
Can I use these lag bolts for metal or concrete?
These are specifically designed as wood screws (lag bolts for wood). The sharp point and thread pattern are optimized for gripping lumber, plywood, and timber. For metal or concrete, you would need self-tapping metal screws or concrete anchors. Stick with wood materials for best results.
Do you offer other sizes or custom lengths?
Absolutely – we have many other dimensions available (longer lengths, different diameters). If the size you need isn't listed, just contact us with your requirements. We're happy to help with custom orders or bulk quantities.
⚠️ Note: Due to manual measurement, slight size variations (±0.5mm) may occur. Colors on screen may differ slightly from the actual product.
