M20708/45-01

View detailed technical data, stock status, and sourcing information for: M20708/45-01
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Federal Supply Group

Electrical and Electronic Equipment Components

Federal Supply Classification

5990 Synchros and Resolvers

National Stock Number

5990-00-070-8522

Item Name Code

02073

Assigment Date

07/20/1967 (59 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.

standard round d body style, 1.9985 inches minimum and 1.9995 inches maximum second shoulder diameter, 0.5950 inches nominal pilot diameter, 1.9850 inches minimum and 1.9900 inches maximum shoulder 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: 1.9850 inches minimum and 1.9900 inches maximum
Pilot Diameter: 0.5950 inches nominal
Second Shoulder Diameter: 1.9985 inches minimum and 1.9995 inches maximum
Second Shoulder Length: 0.1700 inches nominal
Overall Length: 4.2990 inches nominal
Flange Diameter: 2.2490 inches minimum and 2.2500 inches maximum
Flange Thickness: 0.2500 inches nominal
Body Diameter: 1.9900 inches maximum
Shaft Diameter: 0.2403 inches minimum and 0.2405 inches maximum single shaft
Shaft Length: 0.7190 inches nominal single shaft
Fragility Factor: moderately rugged
Maximum Temp Rise: 20.0 celsius
Body Size: 23
Rotor Input Voltage Rating In Volts: 115.0 nominal
Frequency In Hertz: 400.0 nominal
Rotor Input Current Rating: 245.0 milliamperes maximum
Rotor Input Electrical Power Rating: 1.7 watts nominal
Zro Impedance Magnitude In Ohms: 470.00 minimum and 580.00 maximum
Zro Impedance Angle In Deg: 84.00 minimum and 87.50 maximum
Zss Impedance Magnitude In Ohms: 21.60 minimum and 26.00 maximum
Zss Impedance Angle In Deg: 42.00 minimum and 47.00 maximum
Phase Shift Angle In Deg: 1.000 input to output nominal
Maximum Fundamental Null Voltage In Millivolts Per Volt: 32.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt: 48.00
Electrical Error Angular Range In Minutes: -6.0 to 6.0
Spline Tooth Quantity: 22 single shaft
Torque Gradient Per Angular Deg: 0.200 inch-ounces maximum
Pilot Length: 0.0430 inches nominal
Aft Of First Flange Diameter: 1.9985 inches minimum and 1.9995 inches maximum
Mounting Surface To Terminal End Distance: 4.2990 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: 0.783 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: 5 screw
Specification/Standard Data: 81349-mil-s-20708/45 government specification

Replaces National Stock Numbers

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

NSN	Name	Date
5990-00-519-7891	No Name Available	02/13/1970
5990-00-583-9212	No Name Available	06/21/2013
5990-00-636-4124	No Name Available	05/01/1979
5990-00-905-7395	No Name Available	08/13/1969
5990-01-066-0461	No Name Available	07/10/2013
5990-01-135-0924	No Name Available	08/01/1985

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