The Synchro,control Transformer, cataloged under National Stock Number 5990-00-421-0950, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5990-00-421-0950 |
| Item Name | Synchro,control Transformer |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Status | ACTIVE |
| Body Size | 8 |
| Shaft Type | ROUND, SLOTTED SINGLE SHAFT |
| Flange Diameter | 0.7470 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN |
| Undercut Width | 0.0620 INCHES NOMINAL IN |
| Shaft Diameter | 0.0895 INCHES MINIMUM AND 0.0900 INCHES MAXIMUM SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 365.00 NOMINAL |
| Undercut Diameter | 0.6880 INCHES MINIMUM AND 0.6910 INCHES MAXIMUM IN |
| Body Style | STANDARD ROUND A |
| Flange Thickness | 0.0620 INCHES NOMINAL IN |
| Stator Input Current Rating | 350.0 MILLIAMPERES NOMINAL |
| Phase Shift Angle in Deg | 8.500 INPUT TO OUTPUT NOMINAL |
| Mounting Surface to Terminal End Distance | 1.2400 INCHES MAXIMUM IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Zro Resistance in Ohms | 470.00 NOMINAL |
| Stator Input Electrical Power Rating | 73.0 MILLIWATTS NOMINAL |
| Plus J Zso Reactance in Ohms | 330.00 NOMINAL |
| Terminal Location | REAR |
| Shaft Length | 0.3660 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM SINGLE SHAFT IN |
| Pilot Diameter | 0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN |
| Stator Input Voltage Rating in Volts | 11.8 NOMINAL |
| Shaft Slot Width | 0.0250 INCHES NOMINAL SINGLE SHAFT IN |
| Plus J Zro Reactance in Ohms | 1770.00 NOMINAL |
| Transformation Ratio | 2.203 STATOR TO ROTOR NOMINAL |
| Pilot Length | 0.0380 INCHES MINIMUM AND 0.0430 INCHES MAXIMUM IN |
| Zso Resistance in Ohms | 81.00 NOMINAL |
| Electrical Error Angular Range in Minutes | -8.0 TO 8.0 |
| Actuator Friction Torque at Plus 25 Deg Celsius | 3.00 CENTIMETER-GRAMS NOMINAL CM |
| Material | STEEL CORROSION RESISTING BODY |
| Terminal Type and Quantity | 5 WIRE LEAD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| CM01004908 | 3/9 Design control — primary reference Kearfott Corp Soma Forwarding Div |
| 275393 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5990-00-421-0950 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): 5855-01-534-2279. Verify interchangeability with system specifications before substitution.
Key specifications for 5990-00-421-0950: Body Size: 8; Shaft Type: ROUND, SLOTTED SINGLE SHAFT; Flange Diameter: 0.7470 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN; Undercut Width: 0.0620 INCHES NOMINAL IN. 29 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.
NSN 5990-00-421-0950 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.