What size pilot hole do I need for a 3/8 lag bolt?
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Pilot Hole Diameter for Lag Bolts
Bolt Dia | Shank (Unthreaded) | Pilot Hole Dia |
---|---|---|
3/8 | 3/8 | 15/64 |
7/16 | 7/16 | 9/32 |
1/2 | 1/2 | 5/16 |
9/16 | 9/16 | 23/64 |
Hereof, how big should a pilot hole be for a lag bolt?
3/8"
Moreover, how do you drill a pilot hole for a lag bolt?
When they're lined up, clamp them together so they stay in place. Then, using a bit with a slightly smaller diameter than your lag screw, drill a hole all the way through the materials where you want the screw to go. Since lag screws have hex heads, you can't use a regular screwdriver to tighten them.
Values also are based on lag screw bending yield strength values of 45,000 psi for screws of 3/8 inch and larger diameter, 60,000 psi for 5/16 inch diameter and 70,000 psi for 1/4 inch diame- ter.