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   1/4-20 UNC NC
Clear Hole = Drill ~ Probable Ø
  • Basic.250
  • +.00251/4 (.250) ~ .2525
  • +.0095F (.257) ~ .2595
  • +.0135G (.261) ~ .2635
Cut Tap % ~ Drill ~ Probable Ø
  • 74%#7 (.201) ~ .203
  • 69%#6 (.204) ~ .206
  • 65%#5 (.2055) ~ .2075
Form Tap % ~ Drill ~ Probable Ø
  • 58%#1 (.228) ~ .230
Socket Head Screw Size
  • Basic Head Height.244 - .250
  • Basic Head Diameter.365 - .375
General Data
  • Internal Hex Size3/16
  • Stress Area in Sq. In..0318