120 ± 10 %.
-The unit is separated from the value by a space and placed after the tolerance :
Example: 120 ou 120 ± 12 except for angle degrees : 40° ou 40 ± 3°.
-The conversion of some marks is not possible :
Example: thread of a screw : M12x1.75.
-Use decimals to convert precise values :
Example: 190 mm = 7.48 in.
-Write lengths in feet-inches format:
Example: 20 m = 65 ft 7.4 in or in a table 20 (m) = 65-7.4 (ft-in).
CONVERSION COEFFICIENTS:
Metric Unit (S.I) Coeffi cient Imperial Unit US
°C (Celsius degree) x 1.8 + 32 = °F (Fahrenheit degree)
cm
cv (cheval vapeur) x 0.9859 = hp (horsepower)
bar (bar) x 14.51 = psi (pound-force/square inch)
g (gram) x 0.0353 = oz av (ounce avoirdupois) (oz : lat. onza)
kg (kilogram) x 2.2046 = lb (pound) (lat . libra)
km/h (kilometer per hour) x 0.6214 = mph (miles per hour)
kW (kilowatt) x 1.34048 = hp (horsepower)
(liter) x 0.2642 = gal US (US gallon)
(liter) x 1.0567 = qt US (quart US gallon)
m (meter) x 3.2808 = ft (foot)
m (meter) x 39.37 = in (inch)
m (milliliter) x 0.0338 = oz ( uid ounce) ( : uid, oz : lat. onza)
mm (millimeter) x 0.03937 = in (inch)
µm (micrometer) x 0.03937 = mil (thousands of an inch)
N (Newton) x 0.2248 = lbf (pound-force) (lb : lat. libra, f : force)
N.m (Newton meter) x 0.7376 = ft-lb (pound-force-foot) (ft : foot, lb : lat. libra)
rad/s (radian/second) x 9.5493 = rpm (revolution per minute)
t (metric ton) x 2204.62 = lb (pound) (lat. libra)
tr/min (tour per minute) x 1 = rpm (revolution per minute)
Other unit conversions Coeffi cient
ft (foot) x 12 = in (inch)
lb (pound) (lat . libra) x 16 = oz av (ounce avoirdupois)
m (meter) x 1000 = mm (millimeter)
µm (micrometer) x 0.001 = mm (millimeter)
t (metric ton) x 1000 = kg (kilogram)
° (angle degree) x 0.01745 = rad (radian)
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