Forest Products Laboratory

Title: Withdrawal strength of ring-shank nails embedded in southern pine lumber

Author: Skulteti, M. J.; Bender, D. A.; Winistorfer, S. G.; Pollock, D. G.

Date: 1997

Source: Transactions of the ASAE. Vol. 40, no. 2 (1997): pages 451-456.

Description: Ring-shank nails are used extensively in post-frame construction due to their superior performance, yet surprisingly little testing has been done on nail sizes above 12d Experience in the post-frame industry suggests that published allowable design values for ring-shank nails may be overly conservative and need revision. The goal of the research reported herein was to characterize the withdrawal strength of ring-shank nails embedded in Southern Pine lumber. Three sizes of galvanized and ungalvanized (bright) ring-shank nails from two manufacturers were studied. Ring-shank nails had approximately twice the withdrawal resistance of smooth-shank nails of the same diameter. Galvanizing slightly reduced withdrawal strength (approximately 8%) due to partial filling of the threads. Nail head pull-through was studied as a possible failure mode. Even allowing for galvanizing and head pull-through, strong evidence is presented for increasing withdrawal design values for ring-shank nails.

Keywords: Nail, withdrawal, ring-shank, threaded, annular, timber connectors, nail holding properties, nailed joints, mechanical fasteners, withdrawal resistance

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Citation

Skulteti, M. J.; Bender, D. A.; Winistorfer, S. G.; Pollock, D. G.  1997.  Withdrawal strength of ring-shank nails embedded in southern pine lumber.   Transactions of the ASAE. Vol. 40, no. 2 (1997): pages 451-456..