When installing a dowel joint, the holes should be prepared to:

• A. Significantly larger than the dowel
• B. Exactly the same diameter as the dowel
• C. Slightly deeper than the dowel length
• D. Shallower than the dowel length

Answer: (C)

In a dowel joint, you want the hole depth to accommodate the full length of the dowel plus room for glue so the joint can close cleanly and seat fully. Drilling the holes slightly deeper than the dowel length lets the dowel engage into both pieces without bottoming out, and provides space for adhesive to fill around the dowel. This gives a strong, flush joint even with minor variations in stock thickness.

If the holes were significantly larger or too shallow, the fit would be loose or the dowel wouldn’t seat properly, compromising alignment and strength. Drilling to a depth that’s only the dowel length would leave no room for glue or for adjustments during assembly, which can weaken the bond.