The Synchro,control Transformer, cataloged under National Stock Number 5990-00-856-9203, 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29 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-856-9203 |
| Item Name | Synchro,control Transformer |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Status | ACTIVE |
| Body Size | 10 |
| Shaft Type | ROUND, SLOTTED SINGLE SHAFT |
| Flange Diameter | 0.9360 INCHES MINIMUM AND 0.9370 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 | 140.00 NOMINAL |
| Undercut Diameter | 0.9370 INCHES NOMINAL IN |
| Length | 0.0620 INCHES NOMINAL SHOULDER IN |
| Body Style | STANDARD ROUND C |
| Flange Thickness | 0.0630 INCHES NOMINAL IN |
| Stator Input Current Rating | 80.0 MILLIAMPERES NOMINAL |
| Alignment Hole Bolt Circle Diameter | 0.6780 INCHES NOMINAL IN |
| Phase Shift Angle in Deg | 8.500 INPUT TO OUTPUT NOMINAL |
| Mounting Surface to Terminal End Distance | 1.2410 INCHES MAXIMUM IN |
| Frequency in Hertz | 400.0 NOMINAL |
| Zro Resistance in Ohms | 195.00 NOMINAL |
| Stator Input Electrical Power Rating | 190.0 MILLIWATTS NOMINAL |
| Plus J Zso Reactance in Ohms | 124.00 NOMINAL |
| Zrs Resistance in Ohms | 240.00 NOMINAL |
| Terminal Location | REAR |
| Alignment Hole Quantity | 3 |
| Shaft Length | 0.3750 INCHES NOMINAL SINGLE SHAFT IN |
| Pilot Diameter | 0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.8118 INCHES MINIMUM AND 0.8123 INCHES MAXIMUM IN |
| Stator Input Voltage Rating in Volts | 11.8 NOMINAL |
| Maximum Total Null Voltage Output in Millivolts Per Volt | 30.00 |
| Alignment Hole Depth | 0.0500 INCHES MAXIMUM IN |
| Shaft Slot Width | 0.0200 INCHES NOMINAL SINGLE SHAFT IN |
| Plus J Zro Reactance in Ohms | 760.00 NOMINAL |
| 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 |
|---|---|
| ETH10AS1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5990-00-856-9203 is a Synchro,control Transformer, classified under FSC 5990, Synchros and Resolvers. Status: active.
Key specifications for 5990-00-856-9203: Body Size: 10; Shaft Type: ROUND, SLOTTED SINGLE SHAFT; Flange Diameter: 0.9360 INCHES MINIMUM AND 0.9370 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.
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.