How to Drill the Right Hole Size for a 5/16 Lag Bolt

Learn the correct pilot hole size for a 5/16 lag bolt to ensure secure fastening in wood materials.

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To use a 5/16-inch lag bolt, drill a pilot hole with a diameter of 13/64 inches for softwood and 7/32 inches for hardwood. This ensures the bolt fits correctly without damaging the material.

FAQs & Answers

  1. What is the pilot hole size for a lag bolt? For a 5/16-inch lag bolt, the pilot hole size is 13/64 inches for softwoods and 7/32 inches for hardwoods.
  2. How do you choose the right size drill bit? Choose a drill bit that matches the diameter requirements specified for the type of lag bolt and the material being used.
  3. Can I use a lag bolt in metal? Typically, lag bolts are designed for wood. For metal, consider using a different type of fastener like a machine screw or a self-tapping screw.
  4. What materials are best for lag bolts? Lag bolts are best suited for use in solid and engineered wood, and softwood varieties like pine work well due to their softer nature.

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