MAC215990
26
Revision A
Definitions (continued)
Term
Definition
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
PTO
Power take-off
SAE
Society of Automotive Engineers
Screw
A headed and externally threaded fastener that threads into preformed threads or forms
its own thread when inserted into a mating part
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
SR
Single reel
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) or foot-pounds (lbf
∙
ft)
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
UCA
Upper cross auger
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
