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RESISTOR
COLOR
CODES
The colored bands around
the
body of a color coded
rebL:IhH· rPp-
resent its value in ohms. These colored bands are grouped
toward one end of the resistor body. Starting with this end
of the resistor, the first band represents the first digit of
the resistance value; the second band represents the second
digit; the third band represents the number by which the first
two digits are multiplied. A fourth band of gold or silver rep-
resents a tolerance of ±5% or
±10%
respectively. The absence
of a fourth band indicates a tolerance of ±20%.
CODE
COLOR
1sT DIGIT 2ND DIGIT MULTIPLIER
BLACK--+--
BROWN--+--
RED
-
CRANCE
YELLOW
~;§g~
CRAY
WHITE
COLD
SILVER
I
- - - 1 0
- - -
100
- - - 1,000
·-+---
1qooo
-
100,000
~ooo.ooo
10.000.000
100,000.000
LOOO,OOO,OOO
.I
.01
The ph) s1eal size of a composition resistor is related to Ita
wattage ratiJ1g. Size increases progressively as the wattage
rating is L'lcreased. The diameters of 1/2 watt, 1 watt and
2 walt resistors are approximately 1/8", 1/4" and 5/16",
respectivtl:;.
The color code chart and examples which follow provide the
info: m:!"iun req_u!rfd to identify color coded resistors.
EXAMPLES
r--YELLOW-4
} 47
X
lOOO
I
.
,--VIOLET-7--
(oR
47Kn)
I
,--ORANGE-~000-
~j j~SILVER"'
TOLERANCE
Bl
±
IO"'lo
~--RED
-2
122
X
100,000
i
~-- ~~~ElN-100,000
5(oR
2.2 MEG.)
~~~NO
BAND • TOLERANCE
f
""'f=
±
20 "'lo
USING A PLASTIC
NUT STARTER
A plastic nut starter offers a convenient method
of starting the most used sizes: 3/16" and 1/4"
(3-48 and 6- 32). When the correct end is pushed
down over a nut, the pliable tool conforms to the
shape of the nut and the nut is gently held while it
is being picked up and started on the screw. The
tool should only be used to stact the nut.
6-32
@
®-
-®
3-48
@
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