Fasteners

Machine screw dimensions

According to Shigley and Mischke’s Mechanical Engineering Design (McGraw-Hill 1989) experiments show that the tensile stress supported by a threaded rod equals that of a rod with diameter that is the mean of pitch and minor diameters of the threads.  Thus, the tensile stress area of a threaded fastener is computed from the average of its pitch and minor diameters.

  • Little machine shop provides downloadable lists for tap and clearance holes:  tapdrillsizes.pdf
  • And large listing of fasteners can be found at SmithFast.

 

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