| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 1.125 INCHES |
| THREAD QUANTITY PER INCH | 12 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.587 INCHES MINIMUM |
| FASTENER LENGTH | 4.587 INCHES NOMINAL |
| MATERIAL | STEEL COMP E4340 OR |
| STEEL COMP 8735 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 6150 OR |
| STEEL COMP 4140 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-6098 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR |
| MIL-S-8503 MIL SPEC 4TH MATERIAL RESPONSE OR |
| MIL-S-5626 MIL SPEC 5TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND |
| 43.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 1.051 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 1.245 INCHES MINIMUM AND |
| 1.255 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 1.870 INCHES NOMINAL |
| EXTENDED WASHER THICKNESS | 0.258 INCHES NOMINAL |
| GRIP LENGTH | 3.000 INCHES NOMINAL |
| GRIP DIAMETER | 0.1225 INCHES MINIMUM AND |
| 0.1240 INCHES MAXIMUM |
| SPECIFICATION/STANDARD DATA | 80205-NAS638 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |