| EXTENDED WASHER DIAMETER | 0.312 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.037 INCHES NOMINAL |
| FASTENER LENGTH | 0.200 INCHES NOMINAL |
| HEAD DIAMETER | 0.312 INCHES NOMINAL |
| HEAD HEIGHT | 0.117 INCHES NOMINAL |
| INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-M-20693 MIL STD 2ND MATERIAL RESPONSE PRIMARY WASHER |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-56 MIL STD 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL STD 1ST MATERIAL RESPONSE BEARING SURFACE OF HEAD |
| MATERIAL | PLASTIC PRIMARY WASHER |
| MATERIAL | STEEL COMP 4140 BEARING SURFACE OF HEAD |
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.112 INCHES |
| PRIMARY WASHER MATERIAL THICKNESS | 0.037 INCHES NOMINAL |
| PRIMARY WASHER OUTSIDE DIAMETER | 0.312 INCHES NOMINAL |
| PRIMARY WASHER STYLE | FINISHING |
| SPECIAL FEATURES | COLOR CODE SCREW HEAD AND WASHER LUSTERLESS BLACK PER FED-STD-595,NO. 37038 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 40 |
| WASHER QUANTITY | 1 |