Model: 20SF7478

Nonwire Wound Variable Resistor

Special Features:

Knob on rear end of shaft 0.6232 in. Diameter min. And 0.6238 in. Diameter max; 500 ohm, 0.25 watt internal resistor connected to wiper

Properties:

Section Quantity
1
Body Style
Cylindrical servo mounted
Reliability Indicator
Not established
Pilot Diameter
Between 1.8745 inches and 1.8750 inches
Pilot Length
Between 0.0350 inches and 0.0670 inches
Undercut Diameter
Between 1.8745 inches and 1.8750 inches
Undercut Width
0.0550 inches
Body Diameter
2.000 centimeters
Angle Of Mounting Hole In Deg
30.0
Angle Between Centerlines Of Mounting Holes In Deg
60.0
Shaft Diameter
Between 0.2495 inches and 0.2500 inches
Shaft Length
Between 2.155 inches and 2.208 inches
Body Length
0.910 inches
Mounting Lip Diameter
2.0000 inches
Mounting Lip Depth
0.0550 mils and 0.0670 centimeters
Mounting Hole/stud Circle Diameter
Between 1.682 inches and 1.692 inches
Shaft Style
Round, slotted
Shaft Bearing Type
Ball
Actuator Type
Double ended shaft
Effective Electrical Rotation In Deg Angular Rotation
350.0
Maximum Starting Torque
0.60 inch-ounces
Maximum Running Torque
0.60 inch-ounces
Shaft End Play
0.005 inches
Shaft Runout
0.002 inches
Lateral Runout
0.002 inches
Pilot Diameter Runout
0.001 inches
Shaft Radial Play
0.001 inches
Fragility Factor
Moderately rugged
Screw Thread Diameter
Between 0.076 inches and 0.096 inches
Screw Thread Series Designator
Unc
Screw Thready Qty Per Inch (tpi)
56.0
Mounting Facility Quantity
4
Terminal Location
Radially positioned over more than half the circumference
Mounting Method
Clamp ring and threaded hole
Features Provided
Humidity proof
Cubic Measure
0.910 cubic inches
Electrical Resistance Per Section
2.0 percent, rated amperes c and better flooring
Tap Location From Ccw Terminal Per Section In Deg Of Effective Electrical Rotation
1000.0 single section
Rotary Actuator Travel In Angular Deg
360.0
Function Conformity Tolerance Per Section
-0.10/+0.10 single section
Ambient Tempurature In Deg Celsius Per Section At Zero Percent Rated Power
125.0 single section
Tempurature Coefficient Of Resistance Per Section In Ppm Per Deg Celsius
-400.0/+400.0 single section
Power Dissipation Rating Per Section In Watts
2.0 7th secondary quality
Function Conformity Per Section
Single section independent linearity
Fixed Tap Quantity Per Section
1 single section
Resistance Tolerance Per Section In Percent
-10.0/+10.0 single section
Actuator Travel Control Feature
Continuous motion
Function Characteristic Per Section
7 oclock all primaries
Ambient Tempurature In Deg Celsius Per Section At Full Rated Power
25.0 single section
Test Data Document
82577-960024 drawing (this is the basic governing drawing, such as a contractor drawing, original equipment manufacturer drawing, etc.; excludes any specification, standard or other document that may be referenced in a basic governing drawing)
Terminal Type And Quantity
4 turret
NSN
5905-01-279-7986
Part Number
20SF7478
Description
Resistor,variable,nonwire Wound,
CAGE
25413

A resistor in which a sliding or rolling contact moves over an exposed area of the resistive element to change the ohmic value of the output. The finctional tolerance (linearity) of the output is equal to or less than plus or minus 1 percent on linear outputs. Specified outputs such as sine, cosine, tangent, etc., shall be considered to be precision. For items having manually postioned taps designed to be set and fixed prior to use, see resistor, adjustable. For items with step by step variation, see rehostat and resistor, step by step. For tandem-mounted items designed to function together as an attenuator (and rated accordingly), see attenuator, variable. Excludes resistor (1), variable, wire wound, nonprecision; resistor (1), variable nonwire wound, nonprecision; and resistor (1), variable, wire wound, precision.

Part 20SF7478 NSN 5905-01-279-7986

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
37407
FIIG:
A002A0
Concept No.:
1
App. Key:
C
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:
A
ESD:
A
MMAC:
FX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.2000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
ZZ
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
062960
UFC:
35140
LTL:
77.5
LCL:
--
WCC:
72D
TCC:
Z
SHC:
9
ACC:
Instruments/Radio

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Schedule B and Export
  • Schedule B: 8533400080
  • SITC: 77235
  • End Use: Electric apparatus
  • NAICS: 334416
  • USDA: 1

Freight Class: Variable resistors, including potentiometers, nesoi

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