Model: MIL-S-20708/42

Control Transformer Synchro

Properties:

Body Material
Steel, corrosion resisting
Body Style
Standard round, rotatable stator b
Shoulder Diameter
Between 1.5615 inches and 1.5620 inches
Pilot Diameter
Between 0.9370 inches and 0.9375 inches
Overall Length
3.8400 inches
Flange Diameter
Between 1.7490 inches and 1.7500 inches
Flange Thickness
0.0930 inches
Undercut Diameter
Between 1.6220 inches and 1.6250 inches
Undercut Width
0.0780 inches
Body Diameter
1.9000 inches
Shaft Diameter
0.1870 inches single shaft and 0.1872 inches single shaft
Shaft Length
0.5550 inches single shaft
Body Size
19
Stator Input Voltage Rating In Volts
90.0
Stator Input Current Rating
20.0 milliamperes
Stator Input Electrical Power Rating
350.0 milliwatts
Frequency In Hertz
60.0
Phase Shift Angle In Deg
20.000 input to output
Maximum Fundamental Null Voltage In Millivolts Per Volt
30.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt
60.00
Electrical Error Angular Range In Minutes
-6.0/+6.0
Spline Tooth Quantity
21 single shaft
Torque Gradient Per Angular Deg
0.150 inch-ounces
Pilot Length
0.0400 inches
Shoulder Length
0.1320 inches
Mounting Surface To Terminal End Distance
3.3000 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
Terminal Location
Rear
Shaft Thread Length
0.2000 inches single shaft
Shaft Type
Spline w/threads single shaft
Transformation Ratio
0.735 rotor to stator
Shaft Thread Size
0.185 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
NSN
5990-00-677-6487
Part Number
MIL-S-20708/42
Description
Synchro,control Transformer
CAGE
81349

A synchro consisting of a stator and rotor inductively coupled. The electrical output of the rotor is dependent upon both the position of the rotor and the electrical input to the stator from a transmitter synchro or a differential synchro. Does not include variable resistors, goniometers, or variable transformers.

Part MIL-S-20708/42 NSN 5990-00-677-6487

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
15289
FIIG:
A07800
Concept No.:
1
App. Key:
B
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
061700
UFC:
34580
LTL:
RATING VARIABLE
LCL:
--
WCC:
72D
TCC:
Z
SHC:
9
ACC:
Instruments/Radio

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Schedule B and Export
  • Schedule B: 9014900000
  • SITC: 87412
  • End Use: Marine engines, parts
  • NAICS: 334511
  • USDA: 1

Freight Class: Parts & accessories for direction finding compasses and other navigational instruments and appliances

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