| CRITICALITY CODE JUSTIFICATION | FEAT |
| FASTENER LENGTH | 0.595 INCHES MINIMUM AND 0.625 INCHES MAXIMUM |
| HARDNESS RATING | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| HEAD HEIGHT | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL | STEEL OVERALL |
| MINIMUM TENSILE STRENGTH | 170000 POUNDS PER SQUARE INCH |
| MINIMUM YIELD STRENGTH | 150000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SPECIAL FEATURES | CRITICAL SAFETY ITEM (CSI) |
| SPECIFICATION/STANDARD DATA | 80205-NAS1352 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| WIDTH ACROSS FLATS | 0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.495 INCHES MINIMUM AND 0.625 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNRC |
| THREAD QUANTITY PER INCH | 20 |