| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| FEATURES PROVIDED | CASEHARDENED |
| HEAD DIAMETER | 0.264 INCHES MINIMUM AND 0.285 INCHES MAXIMUM |
| HEAD HEIGHT | 0.099 INCHES MINIMUM AND 0.111 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| MATERIAL | STEEL OVERALL |
| NONMACHINE NOMINAL THREAD DIAMETER | 0.152 INCHES |
| NONMACHINE THREAD STYLE | DRIVE SCREW (TYPE U) |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, DRIVE, ROUND HEAD, TYPE U, STEEL, CARBON, CADMIUM PLATED |
| PILOT LENGTH | 0.062 INCHES NOMINAL |
| PILOT DIAMETER | 0.122 INCHES MINIMUM AND 0.126 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205 - NAS-21318, 25 NOV 1998 WHICH REPLACED MS21318, REV A0./13/65 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| SPECIAL FEATURES | SCREW IS NOT RECOMMENDED FOR USE IN MATERIAL THE THICKNESS OF WHICH IS LESS THAN ONE DIAMETER OF THE SCREW |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL |