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Revision A
Term
Definition
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
R Series header
MacDon R80 and R85 disc headers
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
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
Truck
A four-wheel highway/road vehicle weighing no less than 3400 kg (7500 lb.)
Tension
Axial load placed on a bolt or screw, usually measured in Newtons (N) or
pounds (lb.)
TFFT
Turns from finger tight
Torque
The product of a force X lever arm length, usually measured in Newton-meters (Nm)
or foot-pounds (lbf
∙
ft)
Torque angle
A tightening procedure where fitting is assembled to a precondition (finger tight) and
then nut is turned farther a number of degrees to achieve its final position
Torque-tension
The relationship between assembly torque applied to a piece of hardware and axial
load it induces in bolt or screw
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
Содержание R85
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