73781CS-428: NUT,SELF-LOCKING,EXTENDED WASHER.
NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: CASTELLATED HEXAGON, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.281 INCHES NOMINAL IN, hardness_rating: 46.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.
Government catalog under NSN 5310-01-365-5763, 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 | IRON ALLOY 660 OVERALL |
| nut_style | CASTELLATED HEXAGON |
| thread_class | 3B |
| thread_series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| overall_height | 0.281 INCHES NOMINAL IN |
| hardness_rating | 46.0 ROCKWELL C MAXIMUM |
| locking_feature | PREVAILING TORQUE ALL METAL DESIGN |
| thread_direction | RIGHT-HAND |
| washer_thickness | 0.025 INCHES NOMINAL IN |
| precious_material | SILVER |
| surface_treatment | SILVER OVERALL |
| width_across_flats | 0.306 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| NSN | 5310-01-365-5763 |
| OVERALL HEIGHT | 0.281 INCHES NOMINAL IN |
| WASHER OUTSIDE DIAMETER | 0.420 INCHES MAXIMUM IN |
| WIDTH ACROSS FLATS | 0.306 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OR AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| PRECIOUS MATERIAL | SILVER |
| HARDNESS RATING | 46.0 ROCKWELL C MAXIMUM |
| WASHER THICKNESS | 0.025 INCHES NOMINAL IN |
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| THREAD DIRECTION | RIGHT-HAND |