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Any large panel or table top should be secured in a way that allows it to expand or contract without splitting These screw-slot bits let you create screw slots

Typically the slot is the same width as the center hole, allowing the washer to be removed, replaced, or inserted without completely removing the fastener  1332 Slot ID, 1 Slot to Bolt Hole Length, 14 Thick, Case Hardened Steel Swing C Washer

borgata slot finder The rounded, smooth side of the washer should be placed against the slot, and the rough, flat side should be in contact with the bolt head The smooth surface Button Head Bolt with Flat Washer for T-Slot Kits, SS, 516-18 X 78 , Set of 4