| THREAD DIRECTION | RIGHT-HAND |
| FASTENER LENGTH | 3.047 INCHES MINIMUM AND |
| 3.094 INCHES MAXIMUM |
| MATERIAL | STEEL COMP 4140 OR |
| STEEL COMP 8740 OR |
| STEEL COMP 8735 OR |
| STEEL COMP 4130 OVERALL |
| THREAD LENGTH | 1.656 INCHES MINIMUM AND |
| 1.735 INCHES MAXIMUM |
| HEAD STYLE | HEXAGON |
| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 1.250 INCHES |
| THREAD QUANTITY PER INCH | 12 |
| THREAD CLASS | 3A |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR |
| MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR |
| MIL-S-6098 MIL SPEC 3RD MATERIAL RESPONSE OR |
| MIL-S-6758 MIL SPEC 4TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND |
| 32.0 ROCKWELL C MAXIMUM OVERALL |
| MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH |
| HEAD HEIGHT | 0.640 INCHES MINIMUM AND |
| 0.672 INCHES MAXIMUM |
| WIDTH BETWEEN FLATS | 1.802 INCHES MINIMUM AND |
| 1.815 INCHES MAXIMUM |
| GRIP LENGTH | 1.359 INCHES MINIMUM AND |
| 1.391 INCHES MAXIMUM |
| FEATURES PROVIDED | FINISHED HEAD |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81352 |
| DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | AN20-27A |