Term
Definition
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 configuration typical in North America
NPT
National Pipe Thread: A style of fitting used for low pressure port openings Threads
on NPT fittings are uniquely tapered for an interference fit
ORB
O-ring boss: A style of fitting commonly used in port opening on manifolds, pumps,
and motors
ORFS
O-ring face seal: A style of fitting commonly used for connecting hoses and tubes
This style of fitting 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 the 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 in one of the mating parts
SDD
Single-draper drive
Self-Propelled (SP)
Windrower
Self-propelled machine consisting of a power unit with a header
SK
Single knife
SKD
Single-knife drive
Soft joint
A joint made with the use of a fastener where the 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 7500 lb. (3400 kg)
Timed knife drive
Synchronized motion applied at the cutterbar to two separately driven knives from a
single hydraulic motor
Tension
Axial load placed on a bolt or screw, usually measured in pounds (lb.) or
Newtons (N)
TFFT
Turns from finger tight
Torque
The product of a force X lever arm length, usually measured in foot-pounds (ft·lbf)
or Newton-meters (N·m)
Torque angle
A tightening procedure where the fitting is assembled to a precondition (finger
tight) and then the nut is turned further a number of degrees or a number of flats to
achieve its final position
Torque-tension
The relationship between the assembly torque applied to a piece of hardware and
the axial load it induces in the bolt or screw
ULSD
Ultra low sulphur diesel
UCA
Upper cross auger
214017
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Revision A