| THREAD SERIES | UN |
| NOMINAL THREAD SIZE | 1.250 INCHES |
| THREAD QUANTITY PER INCH | 16 |
| THREAD CLASS | 2B |
| THREAD DIRECTION | RIGHT-HAND |
| MATERIAL | STEEL COMP 1330H OR |
| STEEL COMP 4130H OR |
| STEEL COMP 5130H OR |
| STEEL COMP 8630H OR |
| STEEL COMP 1132 OR |
| STEEL COMP 1137 OR |
| STEEL COMP 1139 OR |
| STEEL COMP 1141 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A304 ASSN STD 1ST MATERIAL RESPONSE OR |
| ASTM A332 ASSN STD 2ND MATERIAL RESPONSE OR |
| ASTM A331 ASSN STD 2ND MATERIAL RESPONSE OR |
| ASTM A304 ASSN STD 3RD MATERIAL RESPONSE OR |
| ASTM A304 ASSN STD 4TH MATERIAL RESPONSE OR |
| 00-S-637 FED SPEC 5TH MATERIAL RESPONSE OR |
| QQ-S-637 FED SPEC 6TH MATERIAL RESPONSE OR |
| QQ-S-637 FED SPEC 7TH MATERIAL RESPONSE OR |
| QQ-S-637 FED SPEC 8TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| NUT STYLE | SLOTTED, HEXAGON |
| NUT HEIGHT | 0.609 INCHES MINIMUM AND |
| 0.641 INCHES MAXIMUM |
| WIDTH ACROSS FLATS | 1.875 INCHES NOMINAL |
| BEARING SURFACE TYPE | WASHER FACED |
| COUNTERSINK ANGLE | 85.0 DEGREES MINIMUM AND |
| 95.0 DEGREES MAXIMUM NUT |