What You Need To Know About Withdrawal Resistance Each year, high winds cause billions of dollars in damage to residential and commercial structures. Some of that damage is directly related to how well fasteners hold residential wood structures together. Now, imagine if fasteners held so tightly to wood that wood actually breaks before the fasteners withdraw from the wood. Those fasteners already exist. SENCO Fasteners, coated with proprietary Sencote®.   THE HIGHEST WITHDRAWAL VALUES IN THE INDUSTRY. "Withdrawal value" is a scientific measurement that determines the amount of pressure at which fasteners "withdraw" from wood. Using head-to-head lab tests, SENCO tested staples and nails of varying lengths, diameters, and crown widths in a battery of tests. The results: SENCO fasteners with Sencote® proved to have up to 35% more holding power than any competitive fastener. In fact, over a two-year test period, SENCO fasteners coated with Sencote® produced an average withdrawal resistance 2.7 times greater than that of uncoated nails!1   .113 X 2 3/8 Smooth Shank Bright D Head & FRH Withdrawal .113 X 2 3/8 Ring Shank, D Head & FRH Withdrawal .120 X 3 Smooth Shank D Head & FRH Withdrawal .120 X 3 Ring D Head & FRH Withdrawal .131 Smooth Bright D Head & FRH Withdrawal The graphs show that SENCO is clearly higher in Withdrawal Resistance than any of its competitors. Note that the higher the “withdrawal value,” the greater the withdrawal resistance. Click on any chart to enlarge. Note: Sencote® is accepted by recognized code authorities such as FHA, HUD and NWPCA as a superior fastener coating for use in the construction trades. 1 Stern, E George, 1974. Effectiveness of plastic polymer coated SENCO nails, Virginia Polytechnic Institute and State University, Wood Research and Wood Construction Lab., Pallet and Container Research Center, Blacksburg, VA. Bulletin 130