Model: MIL-S-20708/55

Differential Transmitter Synchro
Description:

Steel, stainless body material, standard round d body style, 1.9850 inches shoulder diameter, 0.5950 inches pilot diameter, 4.5490 inches overall length.

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
4.5490 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
Maximum Tempurature Rise
25.0 degrees celsius
Body Size
23
Stator Input Voltage Rating In Volts
90.0
Stator Input Current Rating
215.0 milliamperes
Stator Input Electrical Power Rating
4.8 watts
Frequency In Hertz
60.0
Zso Impedance Magnitude In Ohms
Between 370.00 and 460.00
Zso Impedance Angle In Deg
Between 74.00 and 78.00
Zrs Impedance Magnitude In Ohms
Between 175.00 and 220.00
Zrs Impedance Angle In Deg
Between 15.00 and 20.00
Phase Shift Angle In Deg
11.500 input to output
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
Torque Gradient Per Angular Deg
0.030 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
3.8300 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 single shaft
Terminal Location
Rear
Shaft Thread Length
0.2900 inches single shaft
Shaft Type
Spline w/threads single shaft
Transformation Ratio
1.154 rotor to stator
Shaft Thread Size
0.250 inches single shaft
Shaft Radial Play Determining Weight
8.0 ounces
Shaft End Play Determining Weight
16.0 ounces
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
6 screw
Specification Data
81349-mil-s-20708/55 government specification
NSN
5990-00-018-9721
Part Number
MIL-S-20708/55
Description
Synchro,differential Transmitter
CAGE
81349

A synchro, the rotor of which is mechanically positioned for modifying electrical angular information, received from a transmitter synchro and transmitting to receiver synchro or control transformer synchro electrical information corresponding to the sum or difference of the electrical input angle and its rotor position angle. Does not include variable resistors, goniometers, variable transformers, or items with dials.

Part MIL-S-20708/55 NSN 5990-00-018-9721

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
02071
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:
2.5000lbs
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
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