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   3/8-16 UNC NC
Clear Hole = Drill ~ Probable Ø
  • Basic.375
  • +.0033/8 (.375) ~ .378
  • +.005V (.377) ~ .380
  • +.014W (.386) ~ .389
  • +.018525/64 (.3906) ~ .3936
Cut Tap % ~ Drill ~ Probable Ø
  • 74%5/16 (.3125) ~ .315
  • 70%O (.316) ~ .3185
  • 61%P (.323) ~ .3255
Form Tap % ~ Drill ~ Probable Ø
  • 65%8.75mm (.3445) ~ .347
Socket Head Screw Size
  • Basic Head Height.368 - .375
  • Basic Head Diameter.550 - .562
General Data
  • Internal Hex Size5/16
  • Stress Area in Sq. In..0775