| FASTENER LENGTH | 1.000 INCHES NOMINAL |
| HEAD STYLE | FLAT COUNTERSUNK UNDERCUT |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM F853 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, SOCKET FLAT COUNTERSINK UNC-3A ZINC COATED |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SPECIFICATION/STANDARD DATA | ANSI/ASME B18 PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM B633 TY II CLASS FE/ZN5 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | ZINC OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNC |