| FASTENER LENGTH | 0.438 INCHES NOMINAL |
| HEAD DIAMETER | 0.306 INCHES MINIMUM AND 0.322 INCHES MAXIMUM |
| HEAD HEIGHT | 0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM |
| HEAD STYLE | PAN |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MATERIAL DOCUMENT AND CLASSIFICATION | 66 FED STD ALL MATERIAL RESPONSES FASTENER |
| MATERIAL | COPPER ALLOY PRIMARY WASHER |
| MATERIAL | STEEL COMP 302 OR STEEL COMP 305 FASTENER |
| MINIMUM TENSILE STRENGTH | 90000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.164 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.020 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.306 INCHES MINIMUM AND 0.317 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT | NICKEL PRIMARY WASHER |
| SURFACE TREATMENT | PASSIVATE FASTENER |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.376 INCHES MINIMUM |
| THREAD QUANTITY PER INCH | 32 |
| THREAD SERIES DESIGNATOR | UNC |