| HEAD STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FASTENER OR AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER OR AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE SECONDARY WASHER OR AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE SECONDARY WASHER |
| MATERIAL | STEEL COMP 630 FASTENER OR STEEL COMP XM-13 FASTENER |
| MATERIAL | STEEL COMP 630 PRIMARY WASHER OR STEEL COMP 631 PRIMARY WASHER |
| MATERIAL | STEEL COMP 630 SECONDARY WASHER OR STEEL COMP 631 SECONDARY WASHER |
| PROPRIETARY CHARACTERISTICS | PACS |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| SPECIAL FEATURES | FURNISHED WITH TWO WASHERS, 0.375 IN. MAX DIA; AND ONE NUT MS21044C4 |
| WIDTH BETWEEN FLATS | 0.438 INCHES NOMINAL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | PASSIVATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD QUANTITY PER INCH | 28 |
| THREAD SERIES DESIGNATOR | UNF |