The 4991-028 is a the manufacturer industrial component. Key specifications include color: UNABLE TO DECODE, material: PLASTIC AND STEEL, power_source: EXTERNAL, movement_type: MOVING COIL, PERMANENT MAGNET, overall_width: 4.250 INCHES MINIMUM AND 4.750 INCHES MAXIMUM IN, pointer_color: BLACK SINGLE INDICATOR SINGLE RANGE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-01-205-1976, 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.
| color | UNABLE TO DECODE |
| material | PLASTIC AND STEEL |
| power_source | EXTERNAL |
| movement_type | MOVING COIL, PERMANENT MAGNET |
| overall_width | 4.250 INCHES MINIMUM AND 4.750 INCHES MAXIMUM IN |
| pointer_color | BLACK SINGLE INDICATOR SINGLE RANGE |
| indicator_type | DIAL W/POINTER |
| overall_height | 4.250 INCHES MINIMUM AND 4.750 INCHES MAXIMUM IN |
| overall_length | 10.000 INCHES MAXIMUM IN |
| frequency_rating | 400.0 HERTZ NOMINAL |
| special_features | RED LINE AT 400 HZ |
| style_designator | RECTANGULAR FLUSH MTG |
| NSN | 6625-01-205-1976 |
| COLOR | UNABLE TO DECODE |
| CIRCUIT ATTACHMENT METHOD AND QUANTITY | 2 THREADED STUD |
| NUCLEAR HARDNESS CRITICAL FEATURE | NONHARDENED |
| STYLE DESIGNATOR | RECTANGULAR FLUSH MTG |
| FSC APPLICATION DATA | TEST SET,ELECT. EQUIP. |
| SCALE GRADUATION TYPE | LINEAR SINGLE INDICATOR SINGLE RANGE |
| MEASUREMENT RANGE | +395.0 TO 405.0 HERTZ SINGLE INDICATOR SINGLE RANGE |
| FEATURES PROVIDED | ZERO ADJUSTER |
| POINTER COLOR | BLACK SINGLE INDICATOR SINGLE RANGE |
| MOUNTING STUD DIAMETER | 0.250 INCHES NOMINAL IN |