| THREAD SERIES DESIGNATOR | UNC |
| NOMINAL THREAD DIAMETER | 0.312 INCHES |
| THREAD QUANTITY PER INCH | 18 |
| THREAD CLASS | 2A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.875 INCHES NOMINAL |
| FASTENER LENGTH | 2.940 INCHES MINIMUM AND |
| 3.040 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A307 GR A ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM AND |
| CHROMATE OR |
| ZINC AND |
| CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY2 CL3 FED SPEC 1ST TREATMENT RESPONSE AND |
| MIL-C-81562 MIL SPEC ALL TREATMENT RESPONSES OR |
| QQ-Z-325,TY 2 CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| MINIMUM TENSILE STRENGTH | 55000 POUNDS PER SQUARE INCH |
| HEAD STYLE | BUTTON |
| HEAD DIAMETER | 0.688 INCHES MINIMUM AND |
| 0.719 INCHES MAXIMUM |
| HEAD HEIGHT | 0.156 INCHES MINIMUM AND |
| 0.176 INCHES MAXIMUM |
| NECK LENGTH | 0.156 INCHES MINIMUM AND |
| 0.187 INCHES MAXIMUM |
| NECK WIDTH | 0.307 INCHES MINIMUM AND |
| 0.324 INCHES MAXIMUM |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND |
| A STYLE AND |
| 1 CLASS |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | FF-B-584 |