Lag Screw, 3/8 x 4″

Made from 18-8 stainless steel, this bulk lag screw delivers dependable strength and corrosion resistance for outdoor and marine wood fastening. Suitable for solid wood applications where a long, heavy-duty fastener is needed.

Parts Desk Insights

• Best use case: Ideal for securing heavy wooden components in outdoor or marine projects where corrosion resistance matters (for example decks, fences, or mounting hardware into solid lumber).
• Common issues: Use proper pilot holes and correct drive to prevent stripping or seizing. Stainless steel can be harder to drive than plain steel; consider lubrication or pre-drilling and avoid mixing with dissimilar metals.

Compatible Applications

• Decking and outdoor wood projects
• Fence installation into solid wood
• Marine or saltwater environments (in wood or treated lumber)
• General heavy-duty wood fastening