A screw that looks modest in the hardware tray can leave a sharp point inside a shallow box. Thin bottoms, sanded slats and recessed heads all reduce the wood between the screw tip and the far face. Before fastening a repair, check the actual joint rather than choosing a screw by eye.
Dry-fit the parts in their finished position and measure the wood along the intended screw path. For a bottom fastened to a rail, that means the bottom thickness plus the rail depth where the screw will enter. A gap, groove or nearby edge can change the available depth, so check the fastening location itself rather than a thicker spot elsewhere.
Hold the chosen screw beside the joint, clear of your fingers, with its head at the intended seated position. Picture a countersunk head sitting flush with the surface, not perched above it. Screw-length conventions differ by head style; comparing the actual head-to-tip position avoids relying on a packet label alone. Leave wood beyond the tip rather than aiming for an exact exit point.
A shorter screw is not automatically a sound repair. It still needs enough thread in the receiving piece to hold the parts together, and that depends on the wood, screw and job. If avoiding a protruding tip leaves very little purchase, change the fastening arrangement or replace the damaged part. This simple check is not a strength rating for a loaded crate or a carrying handle.
Try the complete joint on matching scrap first, including the planned pilot hole and any countersink. Clamp the test pieces securely, keep hands out of the drill path and support them on a sacrificial board. Seat the screw without driving it deeper to hide the head, then inspect the far face visually for a point, bulge or split. Do not sweep a bare hand across it to check.
Practical takeaway: check the seated head, the screw tip and the available wood as one assembly. Prove the combination on scrap before using it on the box. A screw should secure the repair without creating a new snag inside it.
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