The Synchro,differential Transmitter, cataloged under National Stock Number 5990-00-702-1990, 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5990-00-702-1990 |
| Primary Part Number | M20708/68-01C |
| Item Name | Synchro,differential Transmitter |
| FSC / FSG | 5990 / 59 — Synchros and Resolvers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Body Size | 28 |
| Shaft Type | SPLINE SINGLE SHAFT |
| Body Diameter | 2.7490 INCHES MINIMUM AND 2.7500 INCHES MAXIMUM IN |
| Flange Diameter | 3.0990 INCHES MINIMUM AND 3.1000 INCHES MAXIMUM IN |
| Shaft Diameter | 0.2405 INCHES NOMINAL SINGLE SHAFT IN |
| Rotor DC Resistance in Ohms | 24.00 MAXIMUM |
| Length | 1.0150 INCHES MINIMUM AND 1.0250 INCHES MAXIMUM SHOULDER IN |
| Body Style | STANDARD ROUND, ROTATABLE HOUSING |
| Flange Thickness | 0.2450 INCHES MINIMUM AND 2.2550 INCHES MAXIMUM IN |
| Torque Gradient Per Angular Deg | 0.300 INCH-OUNCES MAXIMUM IN |
| Stator Input Current Rating | 748.0 MILLIAMPERES NOMINAL |
| Spline Tooth Quantity | 22 SINGLE SHAFT |
| Shaft Thread Length | 0.6900 INCHES MINIMUM AND 0.7100 INCHES MAXIMUM SINGLE SHAFT IN |
| Phase Shift Angle in Deg | 6.500 INPUT TO OUTPUT NOMINAL |
| Mounting Surface to Terminal End Distance | 3.3850 INCHES NOMINAL IN |
| Frequency in Hertz | 60.0 NOMINAL |
| Stator Input Electrical Power Rating | 7.7 WATTS NOMINAL |
| Zrs Resistance in Ohms | 44.00 MAXIMUM |
| Terminal Location | REAR |
| Shaft Maximum Radial Play | 0.0008 INCHES IN |
| Schematic Diagram Designator | 1 Y-ROTOR, 1 Y-STATOR |
| Shaft Length | 0.7200 INCHES MINIMUM AND 0.7400 INCHES MAXIMUM SINGLE SHAFT IN |
| Spline Tooth Diametral Pitch | 96 SINGLE SHAFT |
| Nondefinitive Spec/std Data | 31TDX68 TYPE |
| Shoulder Diameter | 2.6999 INCHES MINIMUM AND 2.7000 INCHES MAXIMUM IN |
| Stator Input Voltage Rating in Volts | 90.0 NOMINAL |
| Transformation Ratio | 1.154 ROTOR TO STATOR NOMINAL |
| Actuator Friction Torque at Plus 25 Deg Celsius | 0.50 INCH-OUNCES MAXIMUM IN |
| Terminal Type and Quantity | 6 SCREW |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| M20708/68-01C PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| 039509 | 5/1 Secondary reference U.S. Government activity |
| 31TDX6B | 5/9 Secondary reference U.S. Government activity |
| 31TDX6C | 5/9 Secondary reference U.S. Government activity |
| M20708/68B-001 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MILS20708-68 | 5/9 Secondary reference U.S. Government activity |
| 5990PL0944897 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| SAE-AS20708/68 | 3/1 Design control — primary reference Sae International Dba Sae International |
NSN 5990-00-702-1990 is a Synchro,differential Transmitter, manufactured by Sae International Dba Sae International, classified under FSC 5990, Synchros and Resolvers. Status: active.
NSN 5990-00-702-1990 has 1 manufacturer part number on file: M20708/68-01C (Sae International Dba Sae International).
Key specifications for M20708/68-01C: Body Size: 28; Shaft Type: SPLINE SINGLE SHAFT; Body Diameter: 2.7490 INCHES MINIMUM AND 2.7500 INCHES MAXIMUM IN; Flange Diameter: 3.0990 INCHES MINIMUM AND 3.1000 INCHES MAXIMUM 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 5990-00-702-1990 has DEMIL Code Q. 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.