M20708/31-01C

View detailed technical data, stock status, and sourcing information for: M20708/31-01C
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

5990 Synchros and Resolvers

National Stock Number

5990-00-677-6480

Item Name Code

02071

Assigment Date

01/01/1963 (63 years ago)

A synchro consisting of a stator and rotor inductively coupled. The rotor is free to turn in accordance with the electrical input from a transmitter synchro or a differential synchro. Does not include variable resistors, goniometers, variable transformers, or items with dials.

1.5615 inches minimum and 1.5620 inches maximum shoulder diameter, 0.9370 inches minimum and 0.9375 inches maximum pilot diameter, standard round c body style, 3.2050 inches nominal overall length, 1.7450 inches minimum and 1.7500 inches maximum flange diameter

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Body Style: standard round c
Shoulder Diameter: 1.5615 inches minimum and 1.5620 inches maximum
Pilot Diameter: 0.9370 inches minimum and 0.9375 inches maximum
Overall Length: 3.2050 inches nominal
Flange Diameter: 1.7450 inches minimum and 1.7500 inches maximum
Flange Thickness: 0.0930 inches nominal
Undercut Diameter: 1.6250 inches nominal
Undercut Width: 0.0780 inches nominal
Shaft Diameter: 0.1870 inches minimum and 0.1872 inches maximum single shaft
Shaft Length: 0.5400 inches nominal single shaft
Maximum Temp Rise: 20.0 celsius
Body Size: 18
Stator Input Voltage Rating In Volts: 90.0 nominal
Stator Input Current Rating: 450.0 milliamperes nominal
Stator Input Electrical Power Rating: 4.5 watts nominal
Frequency In Hertz: 400.0 nominal
Zso Impedance Magnitude In Ohms: 178.00 minimum and 266.00 maximum
Zso Impedance Angle In Deg: 83.00 minimum and 87.00 maximum
Zrs Impedance Magnitude In Ohms: 26.00 minimum and 38.00 maximum
Zrs Impedance Angle In Deg: 47.00 minimum and 56.00 maximum
Phase Shift Angle In Deg: 3.000 input to output nominal
Electrical Error Angular Range In Minutes: -8.0 to 8.0
Spline Tooth Quantity: 21 single shaft
Actuator Friction Torque At Minus 55 Deg Celsius: 0.10 inch-ounces nominal
Torque Gradient Per Angular Deg: 0.060 inch-ounces minimum
Pilot Length: 0.0400 inches nominal
Shoulder Length: unable to decode
Mounting Surface To Terminal End Distance: 2.6700 inches nominal
Spline Tooth Diametral Pitch: 120 single shaft
Shaft Thread Series Designator: unf single shaft
Shaft Thread Direction: right-hand single shaft
Shaft Thread Class: 2a single shaft
Body Material: steel corrosion resisting
Terminal Location: rear
Shaft Thread Length: 0.2000 inches nominal single shaft
Shaft Type: spline w/threads single shaft
Transformation Ratio: 1.154 rotor to stator nominal
Shaft Nominal Thread Size: 0.190 inches single shaft
Test Data Document: "81349-mil-s-20708 specification (includes engineering type bulletins, brochures,etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "nominal", etc.)."
Terminal Type And Quantity: 6 screw
Specification/Standard Data: 81349-mil-s-20708/31 government specification

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5990-00-644-0092	No Name Available	10/30/1967

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
18TDX4B	Differential Transmitter Synchro
18TDX4C	Differential Transmitter Synchro
M20708/31-01C	Differential Transmitter Synchro
MIL-S-20708/31	Differential Transmitter Synchro
SAE-AS20708/31	Differential Transmitter Synchro

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5990-00-677-6480?

The FSCG of the NSN 5990-00-677-6480 is 5990

Does the NSN 5990-00-677-6480 have a Schedule B code assigned?

Yes, the Schedule B code is 9014900000

Does NSN 5990-00-677-6480 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 5990-00-677-6480 contain precious materials?

Precious metal content is unknown

Does NSN 5990-00-677-6480 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 5990-00-677-6480 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963