| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.190 INCHES |
| THREAD QUANTITY PER INCH | 32 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.620 INCHES MINIMUM AND |
| 0.720 INCHES MAXIMUM |
| FASTENER LENGTH | 2.250 INCHES MINIMUM AND |
| 2.280 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1050 PRIMARY WASHER |
| STEEL FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE 1050 ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| SAE J429 GR8 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | DICHROMATE ZINC FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM4345M CAGEC 16764 MFR REF SINGLE TREATMENT RESPONSE FASTENER |
| HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND |
| 46.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | FLAT EXTENDED WASHER |
| HEAD DIAMETER | 0.287 INCHES NOMINAL |
| HEAD HEIGHT | 0.242 INCHES MINIMUM AND |
| 0.252 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.418 INCHES MINIMUM AND |
| 0.438 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.055 INCHES MINIMUM AND |
| 0.065 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | TORX |
| SPLINE MAJOR DIAMETER | 0.287 INCHES NOMINAL |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | DOME INTERNAL TEETH |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.495 INCHES MINIMUM AND |
| 0.508 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.039 INCHES NOMINAL |