M20708/21-01D

View detailed technical data, stock status, and sourcing information for: M20708/21-01D
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

5990 Synchros and Resolvers

National Stock Number

5990-00-924-4167

Item Name Code

15289

Assigment Date

01/20/1966 (60 years ago)

3.0630 inches nominal overall length, 1.3115 inches minimum and 1.3120 inches maximum shoulder diameter, 0.8745 inches minimum and 0.8750 inches maximum pilot diameter, standard round c body style, unable to decode body material

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 c
Shoulder Diameter: 1.3115 inches minimum and 1.3120 inches maximum
Pilot Diameter: 0.8745 inches minimum and 0.8750 inches maximum
Overall Length: 3.0630 inches nominal
Flange Diameter: 1.4320 inches minimum and 1.4370 inches maximum
Flange Thickness: 0.0930 inches nominal
Undercut Diameter: 1.3120 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
Fragility Factor: moderately rugged
Maximum Temp Rise: 10.0 celsius
Body Size: 15
Stator Input Voltage Rating In Volts: 90.0 nominal
Stator Input Current Rating: 13.0 milliamperes maximum
Stator Input Electrical Power Rating: 210.0 milliwatts nominal
Frequency In Hertz: 60.0 nominal
Zso Impedance Magnitude In Ohms: 6000.00 minimum and 7500.00 maximum
Zso Impedance Angle In Deg: 78.00 minimum and 82.00 maximum
Zrs Impedance Magnitude In Ohms: 1300.00 minimum and 1650.00 maximum
Zrs Impedance Angle In Deg: 1300.00 minimum and 1800.00 maximum
Phase Shift Angle In Deg: 9.000 input to output maximum
Maximum Fundamental Null Voltage In Millivolts Per Volt: 65.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt: 45.00
Electrical Error Angular Range In Minutes: -6.0 to 6.0
Spline Tooth Quantity: 21 single shaft
Torque Gradient Per Angular Deg: 0.050 inch-ounces maximum
Alignment Hole Quantity: 4
Pilot Length: 0.0400 inches nominal
Shoulder Length: unable to decode
Mounting Surface To Terminal End Distance: 2.5230 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
Terminal Location: rear
Shaft Thread Length: 0.1850 inches nominal single shaft
Shaft Type: spline w/threads single shaft
Alignment Hole Depth: 0.1250 inches minimum
Transformation Ratio: 0.735 rotor to stator nominal
Alignment Hole Bolt Circle Diameter: 1.1000 inches 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: 5 screw
Specification/Standard Data: 81349-mil-s-20708/21 government specification

Replaces National Stock Numbers

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

NSN	Name	Date
5990-00-961-4726	No Name Available	02/01/1995
5990-01-018-1475	No Name Available	08/01/1986
5990-01-074-8781	No Name Available	09/01/1981

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
AS20708/21-01D	Control Transformer Synchro
M20708/21-001	Control Transformer Synchro
M20708/21-01D	Control Transformer Synchro
M20708/21A-001	Control Transformer Synchro
M20708/504-001	Control Transformer Synchro