• THREAD SERIES DESIGNATOR : UNC
  • NOMINAL THREAD DIAMETER : 0.138 INCHES
  • THREAD QUANTITY PER INCH : 32
  • THREAD CLASS : 2A
  • THREAD DIRECTION : RIGHT-HAND 
  • THREAD LENGTH : 0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM​​​​​​​
  • FASTENER LENGTH : 0.281 INCHES MINIMUM AND 0.312 INCHES MAXIMUM
  • SCREW MATERIAL : STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013​​​​​​​
  • SCREW MATERIAL DOCUMENT AND CLASSIFICATION : 66 FED STD ALL MATERIAL RESPONSES​​​​​​​
  • SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION : QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE​​​​​​​
  • MINIMUM TENSILE STRENGTH : 55000 POUNDS PER SQUARE INCH​​​​​​​
  • HEAD STYLE : A23 PAN
  • HEAD DIAMETER : 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM​​​​​​​
  • HEAD HEIGHT : 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM​​​​​​​
  • INTERNAL DRIVE STYLE : B1 CROSS RECESS TYPE 1​​​​​​​

Machine Screw

  • length: 5/16", thread: 6-32, pan head, cadmium plated carbon steel, coarse thread