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   5/16-18 UNC NC
Clear Hole = Drill ~ Probable Ø
  • Basic.3125
  • +.00255/16 (.3125) ~ .315
  • +.006O (.316) ~ .3185
  • +.013P (.323) ~ .3255
  • +.01812/64 (.3281) ~ .3306
Cut Tap % ~ Drill ~ Probable Ø
  • 75%F (.257) ~ .2595
  • 69%G (.261) ~ .2635
  • 62%17/64 (.2656) ~ .2681
Form Tap % ~ Drill ~ Probable Ø
  • 65%7.25mm (.2854) ~ .2879
Socket Head Screw Size
  • Basic Head Height.306 - .312
  • Basic Head Diameter.457 - .469
General Data
  • Internal Hex Size1/4
  • Stress Area in Sq. In..0524