| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| THREAD QUANTITY PER INCH | 16 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.375 INCHES MINIMUM AND |
| 1.500 INCHES MAXIMUM |
| FASTENER LENGTH | 1.500 INCHES NOMINAL |
| MATERIAL | STEEL PRIMARY WASHER |
| STEEL FASTENER |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE J429 GR 2 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC FASTENER |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2400 ASSN STD 1ST TREATMENT RESPONSE OR |
| AMS 2402 ASSN STD 2ND TREATMENT RESPONSE FASTENER |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND |
| 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.270 INCHES MINIMUM AND |
| 0.295 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.551 INCHES MINIMUM AND |
| 0.562 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.670 INCHES MINIMUM AND |
| 0.694 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.032 INCHES MINIMUM AND |
| 0.040 INCHES MAXIMUM |