Model: MIL-S-20708/53

Control Transformer Synchro

Properties:

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
4.2990 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
Fragility Factor
Moderately rugged
Maximum Tempurature Rise
10.0 degrees celsius
Body Size
23
Stator Input Voltage Rating In Volts
90.0
Stator Input Current Rating
18.5 milliamperes
Stator Input Electrical Power Rating
400.0 milliwatts
Frequency In Hertz
60.0
Zso Impedance Magnitude In Ohms
Between 4200.00 and 5100.00
Zso Impedance Angle In Deg
Between 70.00 and 76.00
Zrs Impedance Magnitude In Ohms
Between 1350.00 and 1650.00
Zrs Impedance Angle In Deg
Between 14.00 and 20.00
Phase Shift Angle In Deg
14.000 input to output
Maximum Fundamental Null Voltage In Millivolts Per Volt
30.00 output
Maximum Total Null Voltage Output In Millivolts Per Volt
45.00
Electrical Error Angular Range In Minutes
-6.0/+6.0
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
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
3.5800 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
Terminal Location
Rear
Shaft Thread Length
0.2900 inches single shaft
Shaft Type
Spline w/threads single shaft
Transformation Ratio
0.735 rotor to stator
Shaft Thread Size
0.250 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-20708/53 government specification
NSN
5990-00-060-2321
Part Number
MIL-S-20708/53
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-20708/53 NSN 5990-00-060-2321

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:
2.1000lbs
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

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

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