| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| THREAD QUANTITY PER INCH | 20 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.341 INCHES MINIMUM AND |
| 0.377 INCHES MAXIMUM |
| FASTENER LENGTH | 0.469 INCHES MINIMUM AND |
| 0.500 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1050 OR |
| STEEL COMP 1551 OR |
| STEEL COMP 1552 OR |
| STEEL COMP 1053 OR |
| STEEL COMP 1054 OR |
| STEEL COMP 1055 OR |
| STEEL COMP 1059 OR |
| STEEL COMP 1060 OR |
| STEEL COMP 1561 OR |
| STEEL COMP 1566 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 |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES PRIMARY WASHER |
| SAE ASSN STD ALL MATERIAL RESPONSES FASTENER |
| SURFACE TREATMENT | CADMIUM OR |
| ZINC OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | GM4252M,FSCM 24617 MFR REF ALL TREATMENT RESPONSES OVERALL |
| HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND |
| 50.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| 30.0 ROCKWELL C MINIMUM AND |
| 40.0 ROCKWELL C MAXIMUM FASTENER |
| HEAD STYLE | PAN |
| HEAD DIAMETER | 0.473 INCHES MINIMUM AND |
| 0.492 INCHES MAXIMUM |
| HEAD HEIGHT | 0.162 INCHES MINIMUM AND |
| 0.175 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | FLAT EXTERNAL TEETH |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.494 INCHES MINIMUM AND |
| 0.510 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.023 INCHES MINIMUM AND |
| 0.028 INCHES MAXIMUM |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-S-92 |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 24617 |
| DESIGN CONTROL REFERENCE | 454542 |