| DIAMETER OF RECESSED PORTION OF SHANK | 0.312 INCHES NOMINAL |
| DISTANCE ACROSS FLATS | 0.247 INCHES NOMINAL |
| LENGTH OF RECESSED PORTION OF SHANK | 0.300 INCHES NOMINAL |
| MATERIAL DOCUMENT AND CLASSIFICATION | BSI BS S143 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | STEEL |
| NOMINAL THREAD SIZE | 0.312 INCHES NUT THREAD |
| NOMINAL THREAD SIZE | 0.312 INCHES STUD THREAD |
| OVERALL LENGTH | 4.000 INCHES NOMINAL |
| SPECIAL FEATURES | RECESS HEX;BOTH ENDS SLOTTED 0.650 IN. WD & 0.046 IN. DEEP,SLOTS EXTEND TO JUST BEYOND THDS & ARE IN LINE WITHIN +OR- 1 DEG |
| STYLE DESIGNATOR | RECESSED |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | BRITISH AEROSPACE AIRCRAFT GROUP S26-13 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 3A NUT THREAD |
| THREAD CLASS | 3A STUD THREAD |
| THREAD DIRECTION | RIGHT-HAND NUT THREAD |
| THREAD DIRECTION | RIGHT-HAND STUD THREAD |
| THREAD LENGTH | 1.000 INCHES NOMINAL NUT THREAD |
| THREAD LENGTH | 1.000 INCHES NOMINAL STUD THREAD |
| THREAD QUANTITY PER INCH | 24 NUT THREAD |
| THREAD QUANTITY PER INCH | 24 STUD THREAD |
| THREAD SERIES DESIGNATOR | UNJF NUT THREAD |
| THREAD SERIES DESIGNATOR | UNJF STUD THREAD |