Predicting Withdrawal Strength of Sheet-Metal-Type Screws in Selected Hardwoods

Screw withdrawal tests using numbers 4, 6, 8, 10, 12, and 14 type A, pan head, sheet metal type screws of varying length, from several species of hardwood obtained from a wide geographical area, indicate that withdrawal strength from the side grain may be reasonably predicted by the expression F = 3.204 D(L-D)3/4 S where F, D, L, and S refer to withdrawal strength, screw diameter, depth of penetration, and shear strength of the wood, respectively. On the average, this equation under-predicted the withdrawal strength of these screws within 4 percent.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member