M20708/25-01B

View detailed technical data, stock status, and sourcing information for: M20708/25-01B
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

5990 Synchros and Resolvers

National Stock Number

5990-00-677-6476

Item Name Code

15289

Assigment Date

01/01/1963 (63 years ago)

A synchro consisting of a stator and rotor inductively coupled. The electrical output of the stator into a receiver synchro, a control transformer or differential synchro is dependent upon the position of its rotor. Does not include variable resistors, goniometers, variable transformers, or items with dials.

3.1330 inches maximum overall length, standard round b body style, unable to decode body material, 1.3115 inches minimum and 1.3120 inches maximum shoulder diameter, 0.8745 inches minimum and 0.8750 inches maximum pilot diameter

Product Characteristics

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

Body Material: unable to decode
Body Style: standard round b
Shoulder Diameter: 1.3115 inches minimum and 1.3120 inches maximum
Pilot Diameter: 0.8745 inches minimum and 0.8750 inches maximum
Overall Length: 3.1330 inches maximum
Flange Diameter: 1.5320 inches minimum and 1.5410 inches maximum
Flange Thickness: 0.0900 inches minimum and 0.0960 inches maximum
Undercut Width: 0.0730 inches minimum and 0.0830 inches maximum
Shaft Diameter: 0.1870 inches minimum and 0.1872 inches maximum single shaft
Shaft Length: 2.6330 inches nominal single shaft
Body Size: 16
Stator Input Voltage Rating In Volts: 115.0 nominal
Stator Input Current Rating: 24.0 milliamperes nominal
Stator Input Electrical Power Rating: 600.0 milliwatts nominal
Frequency In Hertz: 400.0 nominal
Phase Shift Angle In Deg: 8.000 input to output nominal
Maximum Fundamental Null Voltage In Millivolts Per Volt: 40.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt: 60.00
Electrical Error Angular Range In Minutes: -10.0 to 10.0
Spline Tooth Quantity: 21 single shaft
Torque Gradient Per Angular Deg: 0.050 inch-ounces maximum
Pilot Length: 0.0370 inches minimum and 0.0430 inches maximum
Shoulder Length: unable to decode and unable to decode
Mounting Surface To Terminal End Distance: 2.5775 inches minimum and 2.5780 inches maximum
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
Terminal Location: rear
Shaft Thread Length: 0.2000 inches nominal single shaft
Shaft Type: spline w/threads single shaft
Transformation Ratio: 0.735 rotor to stator nominal
Shaft Nominal Thread Size: 0.184 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: 5 screw
Specification/Standard Data: 81349-mil-s-20708/25 government specification

Replaces National Stock Numbers

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

NSN	Name	Date
5895-00-020-6237	No Name Available	06/01/1983

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
16CTB4B	Control Transformer Synchro
2193025-2	Control Transformer Synchro
22217-2	Control Transformer Synchro
M20708/25-01B	Control Transformer Synchro
MIL-S-20708	Control Transformer Synchro
MIL-S-20708/25	Control Transformer Synchro
SAE-AS20708/25	Control Transformer Synchro
VTCB16-4C2	Control Transformer Synchro

FAQs

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

What is the FSCG of the NSN 5990-00-677-6476?

The FSCG of the NSN 5990-00-677-6476 is 5990

Does the NSN 5990-00-677-6476 have a Schedule B code assigned?

Yes, the Schedule B code is 9014900000

Does NSN 5990-00-677-6476 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 5990-00-677-6476 contain precious materials?

Item does not contain precious metal.

Does NSN 5990-00-677-6476 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 5990-00-677-6476 was assigned to the Federal Catalog?

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