Form 169078 Revision C
ENGLISH/METRIC EQUIVALENTS
QUANTITY
INCH-POUND UNITS
FACTOR
SI UNITS (METRIC)
UNIT NAME ABBR. UNIT NAME ABBR.
Area acres acres x 0.4047 = hectares ha
Flow US gallons per minute gpm x 3.7854 = liters per minute L/min
Force pounds force lbf x 4.4482 = Newtons N
Length
inch in. x 25.4 = millimeters mm
foot ft x 0.305 = meters m
Power horsepower hp x 0.7457 = kilowatts kW
Pressure pounds per square inch psi
x 6.8948 = kilopascals kPa
x .00689 = megapascals MPa
Torque
pound feet or foot pounds lbf∙ft or ft∙lbf x 1.3558 = newton meters N·m
pound inches or inch pounds lbf∙in. or in∙lbf x 0.1129 = newton meters N·m
Temperature degrees Fahrenheit ˚F (˚F - 32) x 0.56 = Celsius ˚C
Velocity
feet per minute ft/min x 0.3048 = meters per minute m/min
feet per second ft/s x 0.3048 = meters per second m/s
miles per hour mph x 1.6063 = kilometers per hour km/h
Volume
US gallons US gal. x 3.7854 = liters L
ounces oz. x 29.5735 = milliliters ml
cubic inches in.
3
x 16.3871 = cubic centimeters cm
3
or cc
Weight pounds lb x 0.4536 = kilograms kg
DEFINITIONS
TERM DEFINITION
API American Petroleum Institute
APT Articulating Power Tongue
ASTM American Society Of Testing And Materials
Header
The removable portion of a harvesting machine (windrower, combine, mower) that cuts
and conveys crops to a delivery opening. Includes sickle, reel and conveying systems.
PTO Power Take-Off
rpm Revolutions Per Minute
SAE Society Of Automotive Engineers
Windrower A piece of harvesting equipment used to cut and lay crop in windrows or swaths.
Windrower Tractor The propelling portion of a self-propelled windrower, including the Operator’s station.
Wobble Box
An enclosed system that translates rotating motion from the machine drive into
reciprocating motion to the sickle.
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