Word/Phrase
Abbreviation
alternating current/direct current
AC/DC
angstrom
A
atmosphere
atm
bar
bar
British thermal unit
Btu
Celsius/Centigrade
°C
centimeter
cm
Coulomb
C
Charpy V-notch
Cv
Class
Cl.
cubic foot
ft3
cubic inch
in.3
cubic meter
m3
cubic millimeter
mm3
cubic yard
yd3
day
day
decibel
dB
degree (angle)
deg
degree (temperature)
° (in superscript form)
diameter
dia.
Note: Use only in tables when space is limited.
electron volt
eV
Fahrenheit
°F
foot
ft
foot candle
fc
foot per minute
ft/min
foot per second
ft/sec
foot-pounds
ft-lb
gallon
gal
gram
g
gravitatinal force
g
Note: Italic & closed up to the numeric value.
hertz
Hz
hour
hr (Customary units)
h (SI units)
inch
in.
inch-pounds
in.-lb
inside diameter
I.D.
joules
J
kelvin (SI units)
K
kilogram
kg
kilojoule
kJ
kilopascal
kPa
kilopascal absolute
kPa (absolute)
kilopascal gage
kPa (gage)
kilovolt
kV
kilowatt
kW
kilowatt-hour
kW·h
kips per square inch
ksi
liter
L
lux
lx
maximum
max.
maximum allowable working pressure
MAWP
mega electron volt
MeV
megahertz
MHz
megapascal
MPa
megarad
Mrad
megavolt
MV
meter
m
meter per second
m/s
metric ton
t
mile
mile
miles per hour
mph
milliampere
mA
millimeter
mm
millimeters of mercury
mmHg
minimum
min.
minute
min
month
mo
newton
N
newton-meter
N·m
newton-millimeter
N·mm
nominal pipe size
NPS
ounce
oz
outside diameter
O.D.
parts per billion
ppb
parts per million
ppm
pascal
Pa
plus or minus
±
pound(s)
lb
pound per linear inch
lb/in.
pound per square inch
psi
pound per square inch absolute
psia
pound per square inch gage
psig
pounds-force
lbf
pounds-mass
lbm
radian
rad
Rankin (Customary units)
R
second (time)
sec (Customary units)
s (SI units)
square centimeter
cm2
square foot
ft2
square inch
in.2
square meter
m2
square millimeter
mm2
square yard
yd2
ton
ton
Torr
Torr
volt
V
watt
W
yard
yd
year
yr (Customary)
y (SI units)