predrill size for lagbolts


Old 02-17-01, 12:20 PM
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I am using three sizes of lagbolts: 1/2 inch, 3/4 inch and 1 inch. What size do I predrill for these diameter bolts? Do I predrill the same depth for the entire length of these bolts?
Old 02-17-01, 04:18 PM
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The pilot hole for each should be the diameter of the shaft (not including the threads.

On these three sizes that would be about 1/8" less than the nominal size of the bolt.

This is assuming you're using these bolts in wood. If you're using them in concrete or other material that requires a shield, the shield will tell you the size hole to drill.

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