91581A355: NUT,SELF-LOCKING,HEXAGON.
The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL EXCEPT INSERT, nut_style: HEXAGON, nut_height: 0.203 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL COARSE (UNC), hardness_rating: 32.0 ROCKWELL C MAXIMUM, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.
Government catalog under NSN 5310-01-570-1858, 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 EXCEPT INSERT |
| nut_style | HEXAGON |
| nut_height | 0.203 INCHES NOMINAL IN |
| thread_class | 2 |
| thread_series | UNIFIED NATIONAL COARSE (UNC) |
| hardness_rating | 32.0 ROCKWELL C MAXIMUM |
| thread_direction | RIGHT-HAND |
| width_across_flats | 0.437 INCHES NOMINAL IN |
| end_item_identification | 2540-01-566-6751;GUNNERS SEAT AND RESTRAINT SYSTEM |
| part_name_assigned_by_controlling_agency | 1/4-20 NYLON LOCK NUT |
| NSN | 5310-01-570-1858 |
| WIDTH ACROSS FLATS | 0.437 INCHES NOMINAL IN |
| THREAD SERIES | UNIFIED NATIONAL COARSE (UNC) |
| HARDNESS RATING | 32.0 ROCKWELL C MAXIMUM |
| THREAD DIRECTION | RIGHT-HAND |
| NUT HEIGHT | 0.203 INCHES NOMINAL IN |
| SPECIAL FEATURES | FINISH: BLACK LUSTER-COATED;INCH THREAD SIZE: 0.250 INCH-20;ASTM SPECIFICATIONS: ASTM B117;NOTE: COATING DOES NOT INTERFERE WITH THREAD ENGANEMENT;WITHSTANDS SALT SPRAY OF 500 HOURS;NUTS SHORTER THAN 4 INCHES ARE FULLY THREADED;NUTS LONGER THAN 4 INCHES ARE NOT CONTINUOUSLY THREADED IN |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | 1/4-20 NYLON LOCK NUT |
| NUT STYLE | HEXAGON |
| THREAD CLASS | 2 |
| END ITEM IDENTIFICATION | 2540-01-566-6751;GUNNERS SEAT AND RESTRAINT SYSTEM |