predrill size for lagbolts

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Old 02-17-01, 11:20 AM
mikerevs
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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?
 
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Old 02-17-01, 03:18 PM
George's Avatar
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Location: South Hill, Va. USA
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Mike:

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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