| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| THREAD QUANTITY PER INCH | 24 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.357 INCHES MINIMUM AND |
| 1.500 INCHES MAXIMUM |
| FASTENER LENGTH | 1.440 INCHES MINIMUM AND |
| 1.500 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 1060 PRIMARY WASHER |
| STEEL COMP 1010 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 | ASTM A684 ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| ASTM A108 ASSN STD ALL MATERIAL RESPONSES OR |
| ASTM A576 ASSN STD ALL MATERIAL RESPONSES FASTENER |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OR |
| ZINC AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR |
| ASTM B633,TY 2 CL FE/ZN5 ASSN STD 2ND TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND |
| 53.0 ROCKWELL C MAXIMUM PRIMARY WASHER |
| HEAD STYLE | HEXAGON |
| HEAD HEIGHT | 0.270 INCHES MINIMUM AND |
| 0.295 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 0.552 INCHES MINIMUM AND |
| 0.562 INCHES MAXIMUM |
| WASHER QUANTITY | 1 |
| PRIMARY WASHER STYLE | SPLIT HELICAL RING |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.635 INCHES MINIMUM AND |
| 0.651 INCHES MAXIMUM |
| PRIMARY WASHER MATERIAL THICKNESS | 0.094 INCHES NOMINAL |
| SPECIAL FEATURES | FLAT POINTED END 40.0 DEGREES MIN. TO 45.0 DEGREES MAX. POINT CHAMFER ANGLE |