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Differential Transmitter Synchro NSN 5990-00-018-9721

Item Description

A synchro, the rotor of which is mechanically positioned for modifying electrical angular information, received from a transmitter synchro and transmitting to receiver synchro or control transformer synchro electrical information corresponding to the sum or difference of the electrical input angle and its rotor position angle. Does not include variable resistors, goniometers, variable transformers, or items with dials.

NSN 5990-00-018-9721 NSN: 5990-00-018-9721

Features and Characteristics

Body Material
Steel, stainless
Body Style
Standard round d
Shoulder Diameter
Between 1.9850 inches and 1.9900 inches
Pilot Diameter
0.5950 inches
Second Shoulder Diameter
Between 1.9985 inches and 1.9995 inches
Second Shoulder Length
0.1700 inches
Overall Length
4.5490 inches
Flange Diameter
Between 2.2490 inches and 2.2500 inches
Flange Thickness
0.2500 inches
Body Diameter
1.9900 inches
Shaft Diameter
0.2403 inches single shaft and 0.2405 inches single shaft
Shaft Length
0.7190 inches single shaft
Maximum Tempurature Rise
25.0 degrees celsius
Body Size
23
Stator Input Voltage Rating In Volts
90.0
Stator Input Current Rating
215.0 milliamperes
Stator Input Electrical Power Rating
4.8 watts
Frequency In Hertz
60.0
Zso Impedance Magnitude In Ohms
Between 370.00 and 460.00
Zso Impedance Angle In Deg
Between 74.00 and 78.00
Zrs Impedance Magnitude In Ohms
Between 175.00 and 220.00
Zrs Impedance Angle In Deg
Between 15.00 and 20.00
Phase Shift Angle In Deg
11.500 input to output
Electrical Error Angular Range In Minutes
-6.0 to 6.0
Spline Tooth Quantity
22 single shaft
Actuator Friction Torque At Plus 25 Deg Celsius
0.20 inch-ounces
Torque Gradient Per Angular Deg
0.030 inch-ounces
Shaft Radial Play Test Point
0.125 inches
Shaft Maximum Radial Play
0.0010 inches
Shaft End Play
0.0025 inches
Pilot Length
0.0430 inches
Shoulder Length
0.2500 inches
Aft Of First Flange Diameter
Between 1.9985 inches and 1.9995 inches
Mounting Surface To Terminal End Distance
3.8300 inches
Spline Tooth Diametral Pitch
96 single shaft
Shaft Maximum Runout
0.0008 inches
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
0.2900 inches single shaft
Shaft Type
Spline w/threads single shaft
Transformation Ratio
1.154 rotor to stator
Shaft Thread Size
0.250 inches single shaft
Shaft Radial Play Determining Weight
8.0 ounces
Shaft End Play Determining Weight
16.0 ounces
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", "", etc.).
Terminal Type And Quantity
6 screw
Specification Data
81349-mil-s-20708/55 government specification
FSC
5990 Synchros And Resolvers
NIIN
000189721
NSN
5990000189721

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
23TDX6
Cage Code:
81349
Status:
A
MSDS:
Part Number:
23TDX6B
Cage Code:
81349
Status:
A
MSDS:
Part Number:
M20708/55-001
Cage Code:
81349
Status:
A
MSDS:
Part Number:
M20708-550-001
Cage Code:
81349
Status:
A
MSDS:
Part Number:
M20708/55-01C
Cage Code:
81349
Status:
A
MSDS:
Part Number:
MIL-S-20708/55
Cage Code:
81349
Status:
A
MSDS:
Part Number:
23TDX6C
Cage Code:
81349
Status:
A
MSDS:
Part Number:
23TDX1229
Cage Code:
14404
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 9014900000
  • NAICS: 334511
  • SITC: 87412
  • Description: Parts & accessories for direction finding compasses and other navigational instruments and appliances
  • End Use (Code 22220):
    Marine engines, parts

Q & A

Frequently asked questions for NSN 5990-00-018-9721
What are the manufacturers of nsn 5990000189721?
Does this nsn 5990000189721 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 5990000189721
A synchro, the rotor of which is mechanically positioned for modifying electrical angular information, received from a transmitter synchro and transmitting to receiver synchro or control transformer synchro electrical information corresponding to the sum or difference of the electrical input angle and its rotor position angle. does not include variable resistors, goniometers, variable transformers, or items with dials.
Does nsn 5990000189721 contain any precious metals?
Precious metal content is unknown.
Does nsn 5990000189721 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 5990000189721?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
02071
FIIG:
A07800
App. Key:
B
Cond. Code:
1
Status:
A

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