Angle to Grain Strength of Dowel-Type Fasteners


  • Lawrence A. Soltis
  • Suparman Karnasudirdja
  • James K. Little


Nails, fasteners, timber, connections, strength, density, grain angle


Timber structures require adequate connections between components. Connection design is based on the performance criterion of a single fastener. This study is part of a research effort by the Forest Products Laboratory to establish a common basis design criteria for lateral strength of dowel-type fasteners that includes nails, screws, lag screws, and bolts. A general dowel lateral strength model is determined. It depends on specific gravity, dowel diameter, minimum penetration, and load direction to the angle of grain. The model is then used to determine the diameter at which parallel- and perpendicular-to-grain strength becomes unequal. A nail model is also determined and compared to existing models.


Aune, P., and M. Patton-Mallory. 1986. Theoretical development: lateral load-bearing capacity of nailed joints based on the yield theory. USDA For. Serv. Res. Pap. FPL 469. For. Prod. Lab., Madison, WI.nChu, Y. P. 1978. Strength of nailed joints. Malaysian Forester 41(1):53-73.nFoschi, R. O. 1974. Load-slip characteristics of a nail. Wood Sci. 7(1):69-76.nLeach, K. E. 1964. A survey of literature on the lateral resistance of nails. Dept. For. Publ. No. 1085. Canadian For. Serv., Ottawa, Canada.nLiu, T. J., and L. A. Soltis. 1984. Lateral resistance of nailed joints. For. Prod. J. 34(1):55-60.nMack, J. J. 1960. The strength of nailed joint. Tech. Pap. No. 9. CSIRO, Melbourne, Australia.nMcLain, T. E. 1976. Curvilinear load-slip relations in laterally loaded nailed joints. Proc., For. Prod. Res. Soc. 30th Annu. Meet., pp. 33-51, Toronto, Canada.nNational Forest Products Association. 1982. National design specification for wood construction. Washington, D.C.nNewlin, J. A., and Gahagan, J. M. 1938. Lag screw joints: Their behavior and design. USDA Tech. Bull. 597. For. Prod. Lab., Madison, WI.nPellicane, P. J., and J. Bodig. 1984. Comparison of nailed joint test methods. J. Testing Eval. 12(5):261-267, Sept.nTrayer, G. W. 1932. The bearing strength of wood under bolts. USDA Tech. Bull. 332, For. Prod. Lab., Madison, WI.nU.S. Department Of Agriculture, Forest Service. Wood Handbook. 1974. Agric. Handb. 72 (rev.). Washington, DC.n






Research Contributions