Model: BTM18-L

Electrical Contact Brush

Special Features:

Peak torque: 20 oz/in; power at tp: 60watts; motor constant: 2.59 oz/in; constinuous torque: 6.0 oz/in; power at constinuous torque: 8.5 watts; input volts at constinuous torque: 8.5 volts; electrical time constant: 0.77 milli-second; mechanical time constant: 25 milli-sec; damping factor: 0.048 oz/in/rad/sec; rotor inertia: 0.0012 oz/in/sec; angular excursion: +, - 50 degrees; total breakaway torque: 0.60 oz/in; max allowable wdg temp: 155.0c; number poles: 2; weight: 5.6 oz; winding constants: resistance: 6.5 +, -12.5 percent ohms; voltage at tp: 19.7 volts ; current at tp: 3.03 amps ; torque sensitivity: 6.60 oz/in/amp, +, -10 percent; back e.M.F. 0.047 volts/rad/sec, +, -10 percent; inductance: 5.0 millihenries, +, - 30 percent.

Properties:

Body Style
Cylindrical
Hole Diameter
Between 0.187 inches and 0.188 inches
Distance From Center Of Hole To Outside Edge
Between 0.8593 inches and 0.8595 inches
Spring Free Length
Between 1.717 inches and 1.719 inches
Largest Outside Diameter
0.942 inches
Outer Edge To Slot Edge Distance
0.041 inches
Part Name Assigned By Controlling Agency
Btm18-l brushless dc motors
Style Designator
One piece
NSN
5977-01-595-2227
Part Number
BTM18-L
Description
Brush,electrical Contact
CAGE

An item specifically designed to be used in the transfer of electrical energy to or from another conducting surface. Either the brush or the surface is continually moving during the transfer of energy. The brush is usually composed in part of some form of the element carbon. Includes: (1) a single brush either with or without an attached shunt (flexible wire lead) and/or a helical or flat type pressure spring; (2) a split brush composed of two or more pieces (wafers), which are used in place of one brush usually connected together by individual shunts to a common terminal; (3) paired brushes composed of two identical or non-identical brushes connected together by a common shunt either with or without pressure springs or connected by individual shunts to a common terminal, or with pressure springs and connected to a common bar, bracket or the like either with or without individual shunts; (4) multiple brushes composed of more than two identical or non-identical brushes without pressure springs connected by individual shunts to a common terminal, or with pressure springs and connected to a common bar, bracket or the like by individual shunts. Does not include moving contacts which make and slide past stationary contacts, but are stationary while the circuit is conducting, such as the sliding contacts on a rheostat or the stationary contact on a synchro. Excludes: contact, electrical; and contact assembly, electrical.

Part BTM18-L NSN 5977-01-595-2227

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
00302
FIIG:
A01500
Concept No.:
App. Key:
A
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:
CRITL:
X

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Schedule B and Export
  • Schedule B: 8545200000
  • SITC: 77886
  • End Use: Electric apparatus
  • NAICS: 335991
  • USDA: 1

Freight Class: Carbon or graphite brushes of a kind used for electrical purposes

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