The Synchro,control Transformer, cataloged under National Stock Number 5990-00-677-6490, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-677-6490 |
| Item Name | Synchro,control Transformer |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Status | ACTIVE |
| Body Diameter | 2.2500 INCHES NOMINAL IN |
| Shaft Diameter | 0.2405 INCHES NOMINAL SINGLE SHAFT IN |
| Stator Input Current Rating | 7.0 MILLIAMPERES NOMINAL |
| Spline Tooth Quantity | 22 SINGLE SHAFT |
| Frequency in Hertz | 400.0 NOMINAL |
| Stator Input Electrical Power Rating | 120.0 MILLIWATTS NOMINAL |
| Shaft Length | 0.6760 INCHES NOMINAL SINGLE SHAFT IN |
| Spline Tooth Diametral Pitch | 96 SINGLE SHAFT |
| Shaft Nominal Thread Size | 0.2500 INCHES SINGLE SHAFT IN |
| Stator Input Voltage Rating in Volts | 115.0 NOMINAL |
| Shaft Thread Series Designator | UNF SINGLE SHAFT |
| Terminal Type and Quantity | 5 SCREW |
| Shaft Thread Class | 2A SINGLE SHAFT A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 632446 | 5/1 Secondary reference Lockheed Martin Corporation Div Rms - Mitchel Field |
| MILS20708-46 | 4/1 Identification reference U.S. Government activity |
| 23CT4B | 2/2 Government specification standardization U.S. Government activity |
NSN 5990-00-677-6490 is a Synchro,control Transformer, classified under FSC 5990, Synchros and Resolvers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5990-00-914-0838. Verify interchangeability with system specifications before substitution.
Key specifications for 5990-00-677-6490: Body Diameter: 2.2500 INCHES NOMINAL IN; Shaft Diameter: 0.2405 INCHES NOMINAL SINGLE SHAFT IN; Stator Input Current Rating: 7.0 MILLIAMPERES NOMINAL; Spline Tooth Quantity: 22 SINGLE SHAFT. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.