| CHAMFER ANGLE | 30.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM |
| FASTENER LENGTH | 0.5325 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM |
| HEAD DIAMETER | 0.134 INCHES MINIMUM AND 0.140 INCHES MAXIMUM |
| HEAD HEIGHT | 0.083 INCHES MINIMUM AND 0.086 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 OR 5737 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,CAP,SOCKET HEAD,UNDRILLED AND DRILLED,PLAIN AND SELF-LOCKING,ALLOY STEEL,CORROSION-RESISTANT STEEL AND HEAT-RESISTANT STEEL,UNRC-31 AND UNRC-2A |
| MATERIAL | IRON ALLOY 660 OVERALL |
| NOMINAL THREAD DIAMETER | 0.0860 INCHES |
| SPECIFICATION/STANDARD DATA | 80205-NAS1352 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2700,METHOD 1MTYPE 2 OR 8,CLASS 4 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.5625 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 56 |
| THREAD SERIES DESIGNATOR | UNRC |
| WIDTH ACROSS FLATS | 0.078 INCHES NOMINAL |