SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.5630 INCHES NOMINAL IN, ridge_height: 0.0940 INCHES NOMINAL IN, bore_diameter: 0.5280 INCHES MINIMUM AND 0.5330 INCHES MAXIMUM IN, overall_height: 0.3750 INCHES NOMINAL IN. This product is currently in active production with full OEM support.
This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-021-4002, 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 |
| design_type | SOLID |
| end_diameter | 0.5630 INCHES NOMINAL IN |
| ridge_height | 0.0940 INCHES NOMINAL IN |
| bore_diameter | 0.5280 INCHES MINIMUM AND 0.5330 INCHES MAXIMUM IN |
| overall_height | 0.3750 INCHES NOMINAL IN |
| special_features | NOT CASEHARDENED |
| bore_taper_in_deg | 7.3 |
| first_step_diameter | 1.1720 INCHES NOMINAL IN |
| fsc_application_data | CYLINDER HEAD ASSEMBLIES,DIESEL ENGINE |
| distance_from_end_to_first_step | 0.1560 INCHES NOMINAL IN |
| distance_from_center_to_beginning_of_ridge | 0.5310 INCHES NOMINAL IN |
| NSN | 5305-00-021-4002 |
| THREAD LENGTH | 0.750 INCHES NOMINAL IN |
| NOMINAL THREAD DIAMETER | 0.250 INCHES IN |
| HARDNESS RATING | 100.0 ROCKWELL B MAXIMUM OVERALL |
| MATERIAL | STEEL OVERALL |
| THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| THREAD QUANTITY PER INCH | 20 |
| THREAD DIRECTION | RIGHT-HAND |
| SURFACE TREATMENT | CADMIUM OVERALL |
| HEAD STYLE | HEXAGON |
| THREAD CLASS | 2A A |