The Synchro,transmitter, cataloged under National Stock Number 5990-01-030-5206, is classified within Federal Supply Class 5990 (Synchros and Resolvers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5990-01-030-5206 |
| Primary Part Number | M20708/139-001 |
| Item Name | Synchro,transmitter |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Body Size | 31 |
| Shaft Type | SPLINE W/THREADS SINGLE SHAFT |
| Flange Diameter | 3.1000 INCHES NOMINAL IN |
| Undercut Width | 0.0250 INCHES NOMINAL IN |
| Shaft Diameter | 0.2405 INCHES NOMINAL SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 53.60 MAXIMUM |
| Undercut Diameter | 2.7500 INCHES NOMINAL IN |
| Length | 0.1850 INCHES NOMINAL SHOULDER IN |
| Fragility Factor | MODERATELY RUGGED |
| Body Style | STANDARD ROUND C |
| Flange Thickness | 0.2500 INCHES NOMINAL IN |
| Rotor Input Electrical Power Rating | 2.26 WATTS NOMINAL |
| Zro Impedance Angle in Deg | 83.20 NOMINAL |
| Spline Tooth Quantity | 22 SINGLE SHAFT |
| Shaft Thread Length | 0.3130 INCHES NOMINAL SINGLE SHAFT IN |
| Phase Shift Angle in Deg | 4.400 INPUT TO OUTPUT NOMINAL |
| Mounting Surface to Terminal End Distance | 3.3800 INCHES MAXIMUM IN |
| Frequency in Hertz | 60.0 NOMINAL |
| Zro Resistance in Ohms | 693.00 NOMINAL |
| Terminal Location | REAR |
| Rotor Input Voltage Rating in Volts | 115.0 NOMINAL |
| Shaft Length | 0.7300 INCHES NOMINAL SINGLE SHAFT IN |
| Specification/standard Data | 81349-MIL-S-20708/139 GOVERNMENT SPECIFICATION |
| Body Material | ALUMINUM ALLOY |
| Pilot Diameter | 0.2405 INCHES NOMINAL IN |
| Spline Tooth Diametral Pitch | 96 SINGLE SHAFT |
| Maximum Fundamental Null Voltage in Millivolts Per Volt | 30.00 OUTPUT |
| Shoulder Diameter | 2.7000 INCHES NOMINAL IN |
| Shaft Nominal Thread Size | 0.390 INCHES SINGLE SHAFT IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| M20708/139-001 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| VCX31-6N1 | 5/1 Secondary reference General Dynamics Motion Control Llc |
| 31CX6A | 5/1 Secondary reference U.S. Government activity |
| M20708/139-001 | 5/9 Secondary reference U.S. Government activity |
| MIL-S-20708/139 | 5/9 Secondary reference U.S. Government activity |
| SAE-AS20708/139 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 5990-01-030-5206 is a Synchro,transmitter, manufactured by Sae International Dba Sae International, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-01-030-5206 has 1 manufacturer part number on file: M20708/139-001 (Sae International Dba Sae International).
1 possible match (shared part number, not a government interchangeability claim): 5990-01-040-1320. Verify interchangeability with system specifications before substitution.
Key specifications for M20708/139-001: Body Size: 31; Shaft Type: SPLINE W/THREADS SINGLE SHAFT; Flange Diameter: 3.1000 INCHES NOMINAL IN; Undercut Width: 0.0250 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 5990-01-030-5206 has DEMIL Code D. 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.