0.516″ ≈ 17/32″ · 13.1 mm
Panel expands across the grain (tangential 8.6%)
Design for it: leave 17/32″ of total clearance (half per side in a frame), use elongated screw holes or buttons on tabletops, and never glue a panel of this width into a rigid frame.
FPL method: ΔW = W × S/100 × ΔMC/30. Species values are averages — boards vary, and finish slows moisture exchange but never stops it. Length change along the grain is ~0.01% and ignorable.
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