a helically threaded shank
Deformed shank nails are those that have helical shanks, resembling a screw, or that have shanks covered by rings and grooves. Deformed shanks are used in the hope of increasing the resistance of the nail to being pulled out, compared to plain shank nails.
Lawrence Soltis¹ reports that the withdrawal resistance of ring shank nails is about 40% greater than that of common nails. The benefit is much greater in wood subject to repeated changes in moisture content: under those conditions deformed shank nails can be 4 times better than a plain shank nail of the same diameter. He also suggests a basis for choosing between a ring or a helical shank: “In general, annularly threaded nails sustain larger withdrawal loads, and helically threaded nails sustain greater impact withdrawal work values than do other nail forms.”
Besides this series, many other types of nails are available with ring or spiral shanks.
1. Lawrence A. Soltis.
Chapter 7. Fastenings.
U.S. Dept. of Agriculture. Forest Service. Forest Products Laboratory.
Wood Handbook. Wood as an Engineering Material.
General Technical Report FPL-GTR-113.
Madison, WI: Forest Products Laboratory, March 1999.
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Last revised: 1 September 2007.