| THREAD SERIES DESIGNATOR | UNJF |
| NOMINAL THREAD DIAMETER | 0.4375 INCHES |
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.641 INCHES NOMINAL OVERALL |
| SHANK UNTHREADED HOLE DIAMETER | 0.106 INCHES MINIMUM AND |
| 0.116 INCHES MAXIMUM OVERALL |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.453 INCHES NOMINAL |
| FASTENER LENGTH | 1.750 INCHES MINIMUM AND |
| 1.780 INCHES MAXIMUM |
| SCREW MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 4340 OR |
| STEEL COMP 8740 |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6382 ASSN STD 1ST MATERIAL RESPONSE OR |
| AMS 6415,6484 OR 8740 MIL SPEC 2ND MATERIAL RESPONSE OR |
| AMS 6327,6322 OR 6325 ASSN STD 3RD MATERIAL RESPONSE |
| SCREW SURFACE TREATMENT | CADMIUM |
| SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-QQ-P-416,TYPE II,CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| HEAD STYLE | FLAT COUNTERSUNK |
| HEAD DIAMETER | 0.874 INCHES MINIMUM AND |
| 0.894 INCHES MAXIMUM |
| HEAD HEIGHT | 0.186 INCHES NOMINAL |
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND |
| 101.0 DEGREES MAXIMUM |
| INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) |
| SPECIFICATION/STANDARD DATA | 80205-NAS1620 THRU NAS1628 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,MACHINE,FLAT,100 DEG HEAD,SHORT THREAD,OFFSET CRUCIFORM |