Model: M20708/21A-001

Control Transformer Synchro

Properties:

Body Material
Steel, stainless
Body Style
Standard round c
Shoulder Diameter
Between 1.3115 inches and 1.3120 inches
Pilot Diameter
Between 0.8745 inches and 0.8750 inches
Overall Length
3.0630 inches
Flange Diameter
Between 1.4320 inches and 1.4370 inches
Flange Thickness
0.0930 inches
Undercut Diameter
1.3120 inches
Undercut Width
0.0780 inches
Shaft Diameter
0.1870 inches single shaft and 0.1872 inches single shaft
Shaft Length
0.5400 inches single shaft
Fragility Factor
Moderately rugged
Maximum Tempurature Rise
10.0 degrees celsius
Body Size
15
Stator Input Voltage Rating In Volts
90.0
Stator Input Current Rating
13.0 milliamperes
Stator Input Electrical Power Rating
210.0 milliwatts
Frequency In Hertz
60.0
Zso Impedance Magnitude In Ohms
Between 6000.00 and 7500.00
Zso Impedance Angle In Deg
Between 78.00 and 82.00
Zrs Impedance Magnitude In Ohms
Between 1300.00 and 1650.00
Zrs Impedance Angle In Deg
Between 1300.00 and 1800.00
Phase Shift Angle In Deg
9.000 input to output
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/+6.0
Spline Tooth Quantity
21 single shaft
Torque Gradient Per Angular Deg
0.050 inch-ounces
Alignment Hole Quantity
4
Pilot Length
0.0400 inches
Shoulder Length
0.1320 inches
Mounting Surface To Terminal End Distance
2.5230 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
0.1850 inches single shaft
Shaft Type
Spline w/threads single shaft
Alignment Hole Depth
0.1250 inches
Transformation Ratio
0.735 rotor to stator
Alignment Hole Bolt Circle Diameter
1.1000 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-20708/21 government specification
NSN
5990-00-924-4167
Part Number
M20708/21A-001
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 M20708/21A-001 NSN 5990-00-924-4167

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:
A
ESD:
ESD:
MMAC:
EH
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
1.1000lbs
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:
062120
UFC:
34760
LTL:
RATING VARIABLE
LCL:
--
WCC:
593
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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

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