| MATERIAL | STEEL |
| MATERIAL DOCUMENT AND CLASSIFICATION | HS 2776,HS178 FSCM 73030 MFR REF SINGLE MATERIAL RESPONSE |
| STYLE DESIGNATOR | SHOULDERED |
| SHOULDER DIAMETER | 0.312 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| SHOULDER LENGTH | 0.330 INCHES MINIMUM AND |
| 0.350 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF NUT THREAD |
| UNC STUD THREAD |
| NOMINAL THREAD SIZE | 0.250 INCHES NUT THREAD |
| 0.250 INCHES STUD THREAD |
| THREAD CLASS | 2A NUT THREAD |
| 3A STUD THREAD |
| THREAD QUANTITY PER INCH | 28 NUT THREAD |
| 20 STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 0.260 INCHES NOMINAL NUT THREAD |
| 0.320 INCHES NOMINAL STUD THREAD |
| HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND |
| 50.0 ROCKWELL C MAXIMUM |
| DISTANCE FROM COTTER PIN HOLE CENTERLINE TO NUT END | 0.140 INCHES NOMINAL FIRST HOLE |
| COTTER PIN HOLE DIAMETER | 0.062 INCHES MINIMUM AND |
| 0.072 INCHES MAXIMUM FIRST HOLE |
| SURFACE FINISH | 32.0 MICROINCHES SHOULDERS |