| FASTENER LENGTH | 1.250 INCHES NOMINAL |
| FEATURES PROVIDED | FLAT WASHER AND LOCK WASHER |
| HEAD DIAMETER | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| HEAD HEIGHT | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| HEAD STYLE | PAN NO. 2 |
| INTERNAL DRIVE STYLE | HEXAGON |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | CAPTIVE SOCKET HEAD SCREW ASSEMBLY |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM-A581,582-95B AND QQS-764B CONDITION A(303 SERIES NON-METALLIC) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 1ST MATERIAL RESPONSE OR AMS 5732 OR 5737 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A453(A286 SERIES) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) 2ND MATERIAL RESPONSE OR AMS 5643 OR 2303E(17-4PH) ASSN STD 3RD MATERIAL RESPONSE OR STM A484-03A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 303 OR IRON ALLOY 660 OR STEEL COMP 630 OVERALL |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| WIDTH ACROSS FLATS | 0.188 INCHES NOMINAL |
| THREAD LENGTH | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |