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Worldwide distributor of NSN parts and consumables located in the USA.

Receiver-transmitter Synchro

Model / MPN: 18TRX4A | NSN: 5990-00-997-5237
ITAR Registered seal

A synchro having a dual purpose. It may be used in applications requiring either a receiver or transmitter. For synchros having a single purpose, see synchro, receiver and synchro, transmitter.

Product Details
NATO Stock Number
5990-00-997-5237
Sold in multiples of
1 EA
DEMIL
DEMIL/MLI
Body Material
Steel, stainless
Body Style
Standard round c
Shoulder Diameter
Between 1.5615 inches and 1.5620 inches
Pilot Diameter
Between 0.9370 inches and 0.9375 inches
Overall Length
3.0600 inches
Flange Diameter
Between 1.7450 inches and 1.7500 inches
Flange Thickness
0.0930 inches
Undercut Diameter
1.6250 inches
Undercut Width
0.0780 inches
Shaft Diameter
0.1873 inches single shaft and 0.1875 inches single shaft
Shaft Length
0.5400 inches single shaft
Fragility Factor
Moderately rugged
Maximum Tempurature Rise
35.0 degrees celsius
Body Size
18
Rotor Input Voltage Rating In Volts
115.0
Frequency In Hertz
400.0
Rotor Input Current Rating
400.0 milliamperes
Rotor Input Electrical Power Rating
4.0 watts
Zss Impedance Magnitude In Ohms
Between 16.00 and 21.00
Zss Impedance Angle In Deg
Between 38.00 and 45.00
Phase Shift Angle In Deg
4.000 input to output
Maximum Fundamental Null Voltage In Millivolts Per Volt
50.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt
100.00
Electrical Error Angular Range In Minutes
-8.0/+8.0
Spline Tooth Quantity
21 single shaft
Receiver Error Angular Range In Minutes
-45.0/+45.0
Torque Gradient Per Angular Deg
0.100 inch-ounces
Alignment Hole Quantity
4
Pilot Length
0.0400 inches
Shoulder Length
0.1320 inches
Mounting Surface To Terminal End Distance
2.5200 inches
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 single shaft
Shaft Type
Spline w/threads single shaft
Alignment Hole Depth
0.1250 inches
Transformation Ratio
0.783 stator to rotor
Alignment Hole Bolt Circle Diameter
1.2500 inches
Shaft 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", "", etc.).
Terminal Type And Quantity
5 screw
Specification Data
81349-mil-s-20708/32 government specification
18TRX Series Parts
Solicitations
Solicitation Description Qty UOM Close Date
SPE7M218T2435 Tr Synchro, Receiver 9 EA 04/05/2018
SPE7M219T5534 Tr Synchro, Receiver 9 EA 10/11/2019
SPE7M221T2436 Tr Synchro, Receiver 1 EA 03/08/2021

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18TRX4A Cross Reference
  • M20708/32-01A
  • MIL-S-20708/32
  • 450904-0983
  • 27719
  • 674761
  • M20708-32E001
  • 1.793485
  • 18TRX4A
  • M20708/32-001