M20708/49-01B

View detailed technical data, stock status, and sourcing information for: M20708/49-01B
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

5990 Synchros and Resolvers

National Stock Number

5990-00-677-6492

Item Name Code

02070

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.

1.9985 inches minimum and 1.9995 inches maximum shoulder diameter, standard round d body style, 1.9985 inches minimum and 1.9995 inches maximum second shoulder diameter, 0.5900 inches minimum and 0.6000 inches maximum pilot diameter, 0.1700 inches nominal second shoulder length

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 d
Shoulder Diameter: 1.9985 inches minimum and 1.9995 inches maximum
Pilot Diameter: 0.5900 inches minimum and 0.6000 inches maximum
Second Shoulder Diameter: 1.9985 inches minimum and 1.9995 inches maximum
Second Shoulder Length: 0.1700 inches nominal
Overall Length: 4.5490 inches nominal
Flange Diameter: 2.2490 inches minimum and 2.2500 inches maximum
Flange Thickness: 0.2480 inches minimum and 0.2500 inches maximum
Body Diameter: 1.9900 inches nominal
Shaft Diameter: 0.2403 inches minimum and 0.2405 inches maximum single shaft
Shaft Length: 0.7190 inches nominal single shaft
Body Size: 23
Stator Input Voltage Rating In Volts: 90.0 nominal
Stator Input Current Rating: 950.0 milliamperes maximum
Stator Input Electrical Power Rating: 5.2 watts maximum
Frequency In Hertz: 400.0 nominal
Phase Shift Angle In Deg: 4.000 input to output nominal
Electrical Error Angular Range In Minutes: -6.0 to 6.0
Spline Tooth Quantity: 22 single shaft
Receiver Error Angular Range In Minutes: -45.0 to 45.0
Actuator Friction Torque At Minus 55 Deg Celsius: 0.10 inch-ounces maximum
Torque Gradient Per Angular Deg: 0.060 inch-ounces minimum
Pilot Length: 0.0430 inches nominal
Shoulder Length: unable to decode
Aft Of First Flange Diameter: 1.9985 inches minimum and 1.9995 inches maximum
Mounting Surface To Terminal End Distance: 4.0430 inches nominal
Spline Tooth Diametral Pitch: 96 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: 0.2900 inches nominal single shaft
Shaft Type: spline w/threads single shaft
Transformation Ratio: 1.154 rotor to stator nominal
Shaft Nominal Thread Size: 0.250 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-20708/49 government specification

Replaces National Stock Numbers

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

NSN	Name	Date
5990-00-504-6460	No Name Available	09/01/1982

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
23TDR4A	Differential Receiver Synchro
23TDR4B	Differential Receiver Synchro
M20708/49-01B	Differential Receiver Synchro
MIL-S-20708/49	Differential Receiver Synchro
SAE-AS20708/49	Differential Receiver Synchro

FAQs

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

What is the FSCG of the NSN 5990-00-677-6492?

The FSCG of the NSN 5990-00-677-6492 is 5990

Does the NSN 5990-00-677-6492 have a Schedule B code assigned?

Yes, the Schedule B code is 9014900000

Does NSN 5990-00-677-6492 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 5990-00-677-6492 contain precious materials?

Precious metal content is unknown

Does NSN 5990-00-677-6492 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 5990-00-677-6492 was assigned to the Federal Catalog?

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