| FASTENER LENGTH | 2.41 INCHES MINIMUM AND 2.50 INCHES MAXIMUM |
| HEAD HEIGHT | 0.160 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| HEAD DIAMETER | 0.443 INCHES MINIMUM AND 0.472 INCHES MAXIMUM |
| HEAD STYLE | ROUND |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| III PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW,MACHINE,ROUND HEAD,TYPE 1 CROSS RECESS;1/4-20X2 1/2,MACHINE SCREW,ROUND HEAD,CROSS RECESSED,ZINC PLATED;1/4-20 X 2-1/2" MACHINE SCREW |
| PROPRIETARY CHARACTERISTICS | PACS |
| MINIMUM TENSILE STRENGTH | 60000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A307,GRADE A ASSN STD SINGLE MATERIAL RESPONSE |
| SCREW MATERIAL | STEEL |
| SCREW SURFACE TREATMENT | CHROMATE ZINC |
| SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | ASTM F1941,ZINC FE/ZN TRIVALENT CHROMATE TYPE 3AT ASSN STD SINGLE TREATMENT RESPONSE |
| SPECIFICATION/STANDARD DATA | 05047-ASME B18.24-2015 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 2.41 INCHES MINIMUM AND 2.50 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNC |