Term
De
fi
nition
Nut
An internally threaded fastener that is designed to be paired with a bolt
N-DETENT
The slot opposite the NEUTRAL position on operator’s console
North American header
Header con
fi
guration typical in North America
NPT
National Pipe Thread: A style of
fi
tting used for low pressure port openings Threads
on NPT
fi
ttings are uniquely tapered for an interference
fi
t
ORB
O-ring boss: A style of
fi
tting commonly used in port opening on manifolds, pumps,
and motors
ORFS
O-ring face seal: A style of
fi
tting commonly used for connecting hoses and tubes
This style of
fi
tting is also commonly called ORS, which stands for O-ring seal
rpm
Revolutions per minute
RoHS (Reduction of
Hazardous Substances)
A directive by the European Union to restrict use of certain hazardous substances
(such as hexavalent chromium used in some yellow zinc platings)
SAE
Society of Automotive Engineers
Screw
A headed and externally threaded fastener that threads into preformed threads or
forms its own thread into a mating part
SDD
Single-draper drive
Self-Propelled (SP)
Windrower
Self-propelled machine consisting of a power unit with a header
Soft joint
A joint made with use of a fastener where joining materials are compressible or
experience relaxation over a period of time
spm
Strokes per minute
SR
Single reel
Truck
A four-wheel highway/road vehicle weighing no less than 3400 kg (7500 lb.)
Timed knife drive
Synchronized motion applied at cutterbar to two separately driven knives from a
single hydraulic motor
Tension
Axial load placed on a bolt or screw, usually measured in Newtons (N) or pounds (lb.)
TFFT
Turns from
fi
nger tight
Torque
The product of a force X lever arm length, usually measured in Newton-meters (N
·
m)
or foot-pounds (lbf
·
ft)
Torque angle
A tightening procedure where
fi
tting is assembled to a precondition (
fi
nger tight) and
then nut is turned farther a number of degrees to achieve its
fi
nal position
Torque-tension
The relationship between assembly torque applied to a piece of hardware and axial
load it induces in bolt or screw
UCA
Upper cross auger
Untimed knife drive
Unsynchronized motion applied at cutterbar to two separately driven knives from a
single hydraulic motor or two hydraulic motors
Washer
A thin cylinder with a hole or slot located in the center that is to be used as a spacer,
load distribution element, or a locking mechanism
Windrower
Power unit of a self-propelled header
WCM
Windrower control module
214047
95
Revision A