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Permissible Bearing Value (Across the Grain) of Bolts 

 in Timber, per in. of Length.* (Kidder.) 



*Based on unit stresses of 600 Ibs. per sq. in. for oak, 500 for 

 Southern yellow pine, 400 for Oregon pine, 300 for spruce, and 

 250 for white pine. 



Maximum Permissible Tension, Shear, and Bending 

 Moment (in in.-U,.)for Wrought-iron Bolts in Timber. 



Unit stresses: Tension, 20.000 Ibs., shear, 10 000 Ibs., bending 

 22,500 Ibs. 



*To be used only in truss joints. Not safe for rods. 



