| THREAD SERIES DESIGNATOR | UNF | 
| NOMINAL THREAD DIAMETER | 0.500 INCHES | 
| THREAD QUANTITY PER INCH | 20 | 
| THREAD CLASS | 3A | 
| THREAD DIRECTION | RIGHT-HAND | 
| THREAD LENGTH | 1.180 INCHES NOMINAL | 
| FASTENER LENGTH | 2.500 INCHES NOMINAL | 
| MATERIAL | STEEL COMP 8637 OR | 
 | STEEL COMP 8640 OVERALL | 
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL | 
| SURFACE TREATMENT | PHOSPHATE ZINC OVERALL | 
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | JDT826,FSCM75160 MFR REF SINGLE TREATMENT RESPONSE OVERALL | 
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND | 
 | 40.0 ROCKWELL C MAXIMUM OVERALL | 
| HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER | 
| HEAD HEIGHT | 0.390 INCHES NOMINAL | 
| WIDTH BETWEEN FLATS | 0.611 INCHES MINIMUM AND | 
 | 0.627 INCHES MAXIMUM | 
| EXTENDED WASHER DIAMETER | 0.714 INCHES NOMINAL | 
| EXTENDED WASHER THICKNESS | 0.120 INCHES MINIMUM AND | 
 | 0.140 INCHES MAXIMUM | 
| EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 | 
| FIRST DIAMETER FROM HEAD | 0.413 INCHES MINIMUM AND | 
 | 0.423 INCHES MAXIMUM | 
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 1.320 INCHES NOMINAL |