• THREAD SERIES DESIGNATOR : UNF
  • NOMINAL THREAD DIAMETER : 0.250 INCHES 
  • THREAD QUANTITY PER INCH : 28
  • THREAD CLASS : 2A
  • THREAD DIRECTION : RIGHT-HAND​​​​​​​
  • THREAD LENGTH  : 0.875 INCHES MAXIMUM​​​​​​​
  • FASTENER LENGTH : 0.875 INCHES NOMINAL​​​​​​​
  • MATERIAL : STEEL OVERALL​​​​​​​
  • MATERIAL DOCUMENT AND CLASSIFICATION : SAE J429 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
  • SURFACE TREATMENT : ZINC AND CHROMATE OVERALL​​​​​​​ 
  • SURFACE TREATMENT DOCUMENT AND CLASSIFICATION : ASTM B633 TY 2 SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL​​​​​​​
  • HARDNESS RATING : 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL​​​​​​​
  • MINIMUM TENSILE STRENGTH : 150000 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 8 GRADE​​​​​​​
  • MANUFACTURERS CODE : 81348
  • NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE : FF-S-85​​​​​​​

 

Machine Bolt

  • Fastener Length: 7/8", Thread: 1/4-28, Thread Length: 7/8"