PRODUCT OVERVIEW
Term
Definition
Nut
An interna lly
threaded fastener that is designed to be paired with a bolt
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 c ommonly used in port o pening on manifolds, p umps,
and motors
ORFS
O-ring fac e
seal: A style o f 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
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 s ome yellow zinc platings)
SAE Society
of Automotive Engineers
Screw
A headed and externally threaded fastener that threads into preformed threads or
forms it s own thread in one of the mating parts
SDD Single-draper drive
SK Singl
eknife
SKD Single-knife drive
Soft joint
A joint made with the use of a fastener whe re the joining materials are compressible
or experience relaxation over a period of time
spm
Str
okes per min ute
SR Single reel
Tr
actor
Ag
ricultural type tractor
Truck
A four-wheel highway/road vehicle weighing no less than 7500 lbs (3400 kg)
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 assemb le d 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
UCA
Upper cross auger
Untimed knife drive
Unsynchronized motion applied at the 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
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