Journal of Wood Science

, Volume 56, Issue 6, pp 502–506 | Cite as

Study of mechanical properties of wooden bolt-nut connector I: effect of size and shape of thread on withdrawal strength

  • Koji Adachi
  • Katsuhiro Takehira
  • Tomoaki Soma
  • Masafumi Inoue


The withdrawal strength of a bolt-nut connector made from wood-based material was evaluated. The thread strength of the wooden bolt-nut connector was tested to select various parameters of the connector and the type of wood material; the wood materials tested were hard maple, white oak, ebony, glue-laminated bamboo, and densified Japanese cedar. A plane model of wooden threads with various thread angles was also evaluated. The results showed that the maximum failure load of the thread increased with increasing bolt density and connection area, which was calculated from the diameter of the bolt and the thickness of the nut. The withdrawal resistance after reaching the maximum load underwent a graded decrease because the bolt threads were broken one by one. In addition, the thread strength depended on the thread angle. In the model with a thread angle of 90°, compressive deformation in the transverse direction occurred prior to shear deformation along the root of the threads; the model with this thread angle thus had higher strength than those with other angles.

Key words

Bolt-nut connector Withdrawal strength Thread angle Densified wood 


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Copyright information

© The Japan Wood Research Society 2010

Authors and Affiliations

  • Koji Adachi
    • 1
    • 2
  • Katsuhiro Takehira
    • 1
  • Tomoaki Soma
    • 3
  • Masafumi Inoue
    • 1
    • 2
  1. 1.Asian Natural Science Environmental CenterThe University of TokyoBunkyo-ku, TokyoJapan
  2. 2.Japan Science and Technology AgencyCore Research for Evolutional Science and TechnologyTokyoJapan
  3. 3.Biomaterial Sciences Department, Graduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan

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