21551-1: PRINTED CIRCUIT BOARD.
Strong colours, velvet-soft feel, powerful protection: the hallmarks of our "Finest Feel" cover. A combination of design and resilience! The silky finish perfects the cover surface and gives your smartphone a sleeve that sits pleasantly in the hand and caresses the skin.
This part is cataloged in the U.S. Government catalog under NSN 5305-00-021-5511, 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 |
| head_style | HEXAGON |
| head_height | 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN |
| thread_class | 2A A |
| thread_length | 1.000 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN |
| fastener_length | 5.656 INCHES MINIMUM AND 5.750 INCHES MAXIMUM IN |
| hardness_rating | 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL |
| thread_direction | RIGHT-HAND |
| surface_treatment | CADMIUM OR ZINC OVERALL |
| width_between_flats | 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| nominal_thread_diameter | 0.375 INCHES IN |
| minimum_tensile_strength | 120000 POUNDS PER SQUARE INCH LBS |
| NSN | 5305-00-021-5511 |
| HEAD HEIGHT | 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN |
| FASTENER LENGTH | 5.656 INCHES MINIMUM AND 5.750 INCHES MAXIMUM IN |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| THREAD LENGTH | 1.000 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN |
| HARDNESS RATING | 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES IN |
| HEAD STYLE | HEXAGON |
| THREAD DIRECTION | RIGHT-HAND |
| WIDTH BETWEEN FLATS | 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |