520391: 520391.
The 520391 is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303MA OR STEEL COMP 303PB OR STEEL COMP 303 PLUS X OVERALL, head_style: PAN, head_height: 0.090 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.310 INCHES NOMINAL IN, thread_length: 2.455 INCHES NOMINAL IN. This part is cataloged in the U.S.
Government catalog under NSN 5305-01-168-4480, 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 303 OR STEEL COMP 303SE OR STEEL COMP 303MA OR STEEL COMP 303PB OR STEEL COMP 303 PLUS X OVERALL |
| head_style | PAN |
| head_height | 0.090 INCHES NOMINAL IN |
| thread_class | 2A A |
| head_diameter | 0.310 INCHES NOMINAL IN |
| thread_length | 2.455 INCHES NOMINAL IN |
| fastener_length | 3.145 INCHES MINIMUM AND 3.205 INCHES MAXIMUM IN |
| special_features | COLOR BLACK |
| thread_direction | RIGHT-HAND |
| surface_treatment | OXIDE OVERALL |
| internal_drive_style | CROSS RECESS TYPE II |
| nominal_thread_diameter | 0.189 INCHES IN |
| NSN | 5305-01-168-4480 |
| HEAD HEIGHT | 0.090 INCHES NOMINAL IN |
| FASTENER LENGTH | 3.145 INCHES MINIMUM AND 3.205 INCHES MAXIMUM IN |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-13924,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| THREAD LENGTH | 2.455 INCHES NOMINAL IN |
| MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A582 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| FIRST DIAMETER FROM HEAD | 0.143 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN |
| NOMINAL THREAD DIAMETER | 0.189 INCHES IN |
| HEAD STYLE | PAN |
| THREAD DIRECTION | RIGHT-HAND |
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.720 INCHES NOMINAL IN |