Used and surplus W18 beams for sale! Buy and sell W18 w-beams with Eiffel Trading. W18 beams have flange dimensions of 18”. A few popular W18 beam sizes are W18x97, W18x119, W18x164, W18x211, W18x234, and more. W18 beams are a great size for templates, bracing, waler beams, and more.