| THREAD SERIES DESIGNATOR | UNF |
| NOMINAL THREAD DIAMETER | 0.625 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.940 INCHES NOMINAL |
| FASTENER LENGTH | 6.610 INCHES NOMINAL |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS6415 ASSN STD SINGLE MATERIAL RESPONSE OR |
| MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OR |
| CHROMIUM OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 1 FED SPEC 1ST TREATMENT RESPONSE OR |
| MIL-P-6871 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 200000 POUNDS PER SQUARE INCH |
| HEAD DIAMETER | 1.000 INCHES NOMINAL |
| HEAD HEIGHT | 0.374 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.250 INCHES NOMINAL |
| SHOULDER SHAPE | ROUND FIRST SHOULDER |
| RIBBED SECOND SHOULDER |
| SHOULDER DIAMETER | 0.706 INCHES MINIMUM AND |
| 0.707 INCHES MAXIMUM FIRST SHOULDER |
| 0.706 INCHES MINIMUM AND |
| 0.707 INCHES MAXIMUM SECOND SHOULDER |
| SHOULDER LENGTH | 2.270 INCHES NOMINAL FIRST SHOULDER |
| 0.250 INCHES NOMINAL SECOND SHOULDER |
| RIB QUANTITY | 27 |
| RIB MAJOR DIAMETER | 0.706 INCHES MINIMUM AND |
| 0.707 INCHES MAXIMUM |
| RIB LENGTH | 0.250 INCHES NOMINAL |
| DISTANCE FROM LARGEST DIAMETER OF BEARING SURFACE OF HEAD TO RIBS | 5.360 INCHES NOMINAL |
| RIB MINOR DIAMETER | 0.641 INCHES NOMINAL |
| FEATURES PROVIDED | CASEHARDENED |
| SPECIAL FEATURES | HEAD O/0.187 IN. LG EXTENDED WASHER |
| THE MANUFACTURERS DATA | |
| MANUFACTURERS CODE | 17576 |
| DESIGN CONTROL REFERENCE | 538157 |