| MATERIAL DOCUMENT AND CLASSIFICATION | SAE GRADE 5.1 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| PRIMARY WASHER MATERIAL THICKNESS | 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.466 INCHES MINIMUM AND 0.478 INCHES MAXIMUM |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| PROPRIETARY CHARACTERISTICS | PACS |
| MINIMUM TENSILE STRENGTH | 120000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| WASHER QUANTITY | 1 |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.475 INCHES MINIMUM AND 0.575 INCHES MAXIMUM |
| THREAD QUANTITY PER INCH | 20 |
| THREAD SERIES DESIGNATOR | UNC |
| FASTENER LENGTH | 0.625 INCHES NOMINAL |
| HARDNESS RATING | 23.0 ROCKWELL C MINIMUM OVERALL AND 36.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| HEAD DIAMETER | 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM |
| HEAD STYLE | PAN |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |