21FK-518: NUT,SELF-LOCKING,HEXAGON.
The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.266 INCHES MAXIMUM IN, lubrication: SOLUBLE LUBRICANT, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the U.S.
Government catalog under NSN 5310-01-028-0785, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.
Verify compatibility with your specific system configuration before ordering.
| material | STEEL OVERALL |
| nut_style | HEXAGON |
| nut_height | 0.266 INCHES MAXIMUM IN |
| lubrication | SOLUBLE LUBRICANT |
| thread_class | 2B |
| thread_series | UNIFIED NATIONAL COARSE (UNC) |
| locking_feature | PREVAILING TORQUE ALL METAL DESIGN |
| thread_direction | RIGHT-HAND |
| surface_treatment | CADMIUM OVERALL |
| width_across_flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| nominal_thread_size | 0.312 INCHES IN |
| bearing_surface_type | CHAMFERED |
| NSN | 5310-01-028-0785 |
| LUBRICATION | SOLUBLE LUBRICANT |
| WIDTH ACROSS FLATS | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| THREAD DIRECTION | RIGHT-HAND |
| NOMINAL THREAD SIZE | 0.312 INCHES IN |
| LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| NUT HEIGHT | 0.266 INCHES MAXIMUM IN |
| SURFACE TREATMENT | CADMIUM OVERALL |
| NUT STYLE | HEXAGON |