Allowable Loads for 8D Nails Both Regular and Clinched, Driven Through Metal Side Plates Into Stress-Grade Lumber

A series of tests was conducted to determine the ultimate and allowable loads for eightpenny regular and self-clinched nails driven through 20-gage galvanized steel side plates into Douglas-fir, southern pine, and hemlock 2 by 4’s. The composite load-slip data show smooth, rational relationships indicating that the test data are consistent. A conservative allowable lateral resistance load for 8d self-clinching nails using metal side plates is 175 lbs. per nail. This is based on the lower range test values rather than the average and may be used for lateral resistance where nails are driven into 1500f stress-grade Douglas-fir (Coast Region) and southern pine. This load provides a factor of safety of 4.7. The load value is about 12 percent less than the value determined by the proportionality method, and about 25 percent less than that determined by the Forest Products Laboratory method.

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