| FASTENER LENGTH | 0.870 INCHES MINIMUM AND 0.920 INCHES MAXIMUM |
| HARDNESS RATING | 33.0 ROCKWELL C MINIMUM OVERALL AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.225 INCHES NOMINAL |
| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 4150 OVERALL |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| SHOULDER DIAMETER | 0.3145 INCHES MINIMUM SECOND SHOULDER AND 0.3155 INCHES MAXIMUM SECOND SHOULDER |
| SHOULDER DIAMETER | 0.4987 INCHES MINIMUM FIRST SHOULDER AND 0.4997 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER LENGTH | 0.155 INCHES MINIMUM SECOND SHOULDER AND 0.165 INCHES MAXIMUM SECOND SHOULDER |
| SHOULDER LENGTH | 0.380 INCHES MINIMUM FIRST SHOULDER AND 0.390 INCHES MAXIMUM FIRST SHOULDER |
| SHOULDER SHAPE | ROUND SECOND SHOULDER |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| SPECIAL FEATURES | THREAD RELIEF 0.080 TO 0.100 LG.,0.248 TO 0.258 DIA. |
| WIDTH BETWEEN FLATS | 0.865 INCHES MINIMUM AND 0.877 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-STD-171 5.3.2.3 MIL SPEC 1ST TREATMENT RESPONSE OVERALL OR MIL-STD-171 5.3.1.3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PHOSPHATE IRON OVERALL OR PHOSPHATE MANGANESE OVERALL |
| THREAD LENGTH | 0.210 INCHES NOMINAL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 24 |
| THREAD SERIES DESIGNATOR | UNF |