• THREAD SERIES DESIGNATOR : UNC
  • NOMINAL THREAD DIAMETER : 0.250 INCHES
  • THREAD QUANTITY PER INCH : 20​​​​​​​
  • THREAD CLASS : 2A
  • THREAD DIRECTION : RIGHT-HAND
  • THREAD LENGTH : 0.625 INCHES MINIMUM​​​​​​​
  • FASTENER LENGTH : 0.750 INCHES NOMINAL
  • MATERIAL : STEEL OVERALL 
  • MATERIAL DOCUMENT AND CLASSIFICATION : SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL​​​​​​​
  • SURFACE TREATMENT : CADMIUM AND CHROMATE OVERALL
  • SURFACE TREATMENT DOCUMENT AND CLASSIFICATION : QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • HARDNESS RATING : 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
  • MINIMUM TENSILE STRENGTH : 120000 POUNDS PER SQUARE INCH​​​​​​​
  • HEAD STYLE : C1 HEXAGON​​​​​​​
  • HEAD HEIGHT : 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM​​​​​​​ 
  • WIDTH BETWEEN FLATS : 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM​​​​​​​
  • NONDEFINITIVE SPEC/STD DATA : 2 TYPE AND 10P STYLE AND 5 GRADE​​​​​​​
  • MANUFACTURERS CODE : 81348​​​​​​​
  • NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE : FF-S-85​​​​​​​

Hexagon Head Cap Screw

  • Fastener Length: 3/4", Thread: 1/4-20, Thread Length: 5/8", cadmium yellow