The 645-4129-1 is a the manufacturer industrial component. Key specifications include head_style: HEADLESS (SETSCREW), point_style: FLAT, thread_class: 3A A, thread_length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, fastener_length: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, hardness_rating: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL. This product is currently in active production with full OEM support.
This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-231-8103, 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 COMP 4032 OR STEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 8630 OR STEEL COMP 8740 OVERALL |
| head_style | HEADLESS (SETSCREW) |
| point_style | FLAT |
| thread_class | 3A A |
| thread_length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| fastener_length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| hardness_rating | 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL |
| thread_direction | RIGHT-HAND |
| surface_treatment | CADMIUM AND CHROMATE OVERALL |
| width_across_flats | 0.125 INCHES NOMINAL IN |
| internal_drive_style | HEXAGON |
| nominal_thread_diameter | 0.250 INCHES IN |
| NSN | 6625-00-231-8103 |