MacDon A40D - Page 42

262334 24 Revision A
Table 2.1 Definitions (continued)
Term
Definition
Nut
An internally threaded fastener designed to be paired with a bolt
ORB
O-ring boss: A style of fitting commonly used in port openings 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
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)
rpm
Revolutions per minute
SAE
Society of Automotive Engineers
Screw
A headed and externally threaded fastener that threads into preformed threads or forms
its own thread when it is inserted into a mating part.
Self Propelled (SP)
Windrower
Self-propelled machine consisting of a power unit and a header. It is designed to cut and
lay crops into windrows for later harvest
Soft joint
A flexible joint made by use of a fastener in which the joining materials compress or relax
over a period of time
spm
Strokes per minute
SST
Slow speed transport
Tension
An axial load placed on a bolt or screw, usually measured in Newtons (N) or pounds (lb.).
This term can also be used to describe the force a belt exerts on a pulley or sprocket
TFFT
Turns from finger tight
Timed (knife drive)
Synchronized motion applied at cutterbar to two separately driven knives from a single
hydraulic motor
Torque
The product of a force * the length of a lever arm, usually measured in Newton-meters
(Nm), foot-pounds (lbf∙ft), or inch-pounds (lbf∙in)
Torque angle
A tightening procedure in which a fitting is assembled to a specified tightness (usually
finger tight) and then the nut is turned farther by a specified number of degrees until it
achieves its final position
Torque-tension
The relationship between the assembly torque applied to a piece of hardware and the
axial load it induces in a bolt or screw
Untimed (knife drive)
Unsynchronized motion applied at the cutterbar to two separately driven knives from a
single hydraulic motor or from two hydraulic motors
Washer
A thin cylinder with a hole or a slot located in the center, used as a spacer, a load
distribution element, or a locking mechanism
Windrower
The power unit for a header
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