MIL-PRF-19E
1.2.1.3 Switch. The type of attached switch or absence of a switch is identified by a single letter in accordance
with table II.
TABLE II. Switch.
Symbol
Switch
A
No switch
Single pool, single throw switch which is actuated to the
B
"on" position at the start of the clockwise rotation.
1.2.1.4 Operating shaft and length. The operating shaft styles are identified by a two letter symbol. The first letter
indicates operating shaft in accordance with table III, and the second letter indicates operating shaft length, in
accordance with table IV (see 3.1).
TABLE III. Style of operating shaft.
Symbol
Shaft
S
Slotted
TABLE IV. Shaft length
Length of shaft from mounting surface, nominal
Symbol
Bushings N and S
Bushings L and T
in inches (±0.03125)
in inches (±0.03125)
A
0.500
B
0.625
D
0.875
0.875
G
1.250
1.250
K
2.500
1.2.1.5 Resistance. The nominal total resistance value expressed in ohms is identified by a three digit number; the
first two digits represent significant figures and the last specifies the number of zeros to follow. When fractional values
of an ohm are required, the letter "R" will be substituted for one of the significant digits to represent the decimal point,
and the succeeding digits of the group will represent significant figures; e.g., 3R0 signifies 3.0 ohms.
1.2.1.6 Resistance characteristic. The resistance characteristic is identified by a single letter in accordance with
table V.
TABLE V. Resistance characteristic.
Resistance
Resistance
Symbol
taper
tolerance
±10 percent
A
A
±10
C
C
percent
±10
E
F
percent
2
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