Answer :

For a 3/8 inch lag screw, it's recommended to drill a pilot hole that is slightly smaller in diameter than the screw itself to ensure a secure fit. Typically, a pilot hole diameter of about 5/16 inch is suitable for a 3/8 inch lag screw. This allows the threads of the lag screw to grip into the wood properly while still providing enough support. However, the exact size of the pilot hole may vary depending on factors such as the type of wood and the specific application, so it's a good idea to test the fit beforehand if possible.

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