Model: MIL-S-20708/21

Control Transformer Synchro

Properties:

Body Material
Steel, stainless
Body Style
Standard round b
Shoulder Diameter
Between 1.3115 inches and 1.3120 inches
Pilot Diameter
Between 0.8745 inches and 0.8750 inches
Overall Length
Between 3.0430 inches and 3.0830 inches
Flange Diameter
Between 1.4320 inches and 1.4370 inches
Flange Thickness
0.0930 inches
Undercut Width
0.0780 inches
Shaft Diameter
0.1867 inches single shaft and 0.1872 inches single shaft
Shaft Length
0.5450 inches single shaft and 0.5650 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 Resistance In Ohms
Between 6000.00 and 7500.00
Zrs Resistance In Ohms
Between 1300.00 and 1650.00
Zso Impedance Magnitude In Ohms
Between 78.00 and 82.00
Zrs Impedance Magnitude In Ohms
Between 13.00 and 18.00
Phase Shift Angle In Deg
9.000 input to output
Maximum Fundamental Null Voltage In Millivolts Per Volt
45.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt
65.00
Electrical Error Angular Range In Minutes
-6.0/+6.0
Actuator Friction Torque At Minus 55 Deg Celsius
0.05 inch-ounces
Actuator Friction Torque At Plus 25 Deg Celsius
0.05 inch-ounces
Pilot Length
0.0400 inches
Shoulder Length
0.1320 inches
Mounting Surface To Terminal End Distance
2.3910 inches
Terminal Location
Rear
Shaft Slot Depth
0.0250 inches single shaft
Shaft Slot Width
0.0200 inches single shaft
Shaft Type
Round, slotted single shaft
Alignment Hole Depth
0.1250 inches
Transformation Ratio
0.735 rotor to stator
Alignment Hole Bolt Circle Diameter
Between 1.0970 inches and 1.1030 inches
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
5990-00-254-4825
Part Number
MIL-S-20708/21
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-20708/21 NSN 5990-00-254-4825

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:
EH
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
75.0000lbs
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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