215575 21 Revision B
2.4 Definitions
Understanding the technical terms and acronyms used throughout this document will improve your ability to apply the
procedures detailed herein.
Term
Definition
AHHC
Auto header height control
API
American Petroleum Institute
ASTM
American Society of Testing and Materials
Bolt
A headed and externally threaded fastener that is designed to be paired with a nut
CGVW
Combined gross vehicle weight
Finger tight
Finger tight is a reference position where sealing surfaces or components are making
contact with each other and the fitting has been tightened to a point where the fitting is
no longer loose
F.F.F.T.
Flats from finger tight
GVW
Gross vehicle weight
hp
Horsepower
JIC
Joint Industrial Council: A standards body that developed the standard sizing and shape
for original 37° flared fitting
n/a
Not applicable
Nut
An internally 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 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 an O-ring seal (ORS)
Pick-up header
A machine that attaches to a combine and picks up grain that has been cut and laid in
windrows
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 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
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
Tension
Axial load placed on a bolt or screw, usually measured in Newtons (N) or pounds (lb.)
T.F.F.T.
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 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
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