| FASTENER LENGTH | 4.000 INCHES NOMINAL |
| HEAD STYLE | FLAT COUNTERSUNK |
| HEAD DIAMETER | 1.355 INCHES MINIMUM AND 1.438 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | HEXAGON |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM YIELD STRENGTH | 130000 POUNDS PER SQUARE INCH |
| COUNTERSINK ANGLE | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |