| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.190 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.417 INCHES MINIMUM |
| FASTENER LENGTH | 0.500 INCHES NOMINAL |
| MATERIAL | STEEL COMP 1060 PRIMARY WASHER |
| STEEL COMP 1010 OR |
| STEEL COMP 1011 OR |
| STEEL COMP 1013 OR |
| STEEL COMP 1015 OR |
| STEEL COMP 1016 OR |
| STEEL COMP 1017 OR |
| STEEL COMP 1018 OR |
| STEEL COMP 1019 OR |
| STEEL COMP 1020 FASTENER |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR |
| QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND |
| 53.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | FILLISTER |
| HEAD DIAMETER | 0.292 INCHES MINIMUM AND |
| 0.313 INCHES MAXIMUM |
| HEAD HEIGHT | 0.118 INCHES MINIMUM AND |
| 0.130 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | SLOT |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.283 INCHES MINIMUM AND |
| 0.297 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.040 INCHES NOMINAL |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FFS92 |