LEAD ACCURACY
Lead Accuracy Measured in inch/inch or m/25mm. See Materials
and Manufacturing Processes for additional screw lead accuracy
specifications.
LEAD
The distance the nut advances in one revolution (lead = pitch x
number of starts).
PITCH
The distance along the screw axis from a point on one thread to
a corresponding point on the adjacent thread.
STARTS
The integral number of helical thread elements on the screw shaft.
LASH
Maximum axial free travel of the nut relative to the screw when
new.
ROOT
DIAMETER
The diameter of the screw at the bottom of the thread groove.
THREAD
CODE
Used to build the “Reference Number”. See the Reference
Number Configurator for additional explanation on specifying a custom
length screw.
FORM
This describes the accuracy and geometry of the screw and nut.
STANDARD
SCREW THREADS, LENGTHS AND mATERIALS
All screws are available in sizes that have a right hand
thread and many sizes that have left hand thread.
Standard cut lengths are 36", 72",
144" and 240" depending on screw size), custom cut screws
up to 240" (depending on screw size) in length are available.
Custom length screws over 144" can be manufactured, based on
material availability. See the Reference Number Configurator for
additional explanation on specifying a custom length screw.
Standard length part number product or unmachined
cut to length material may have approximately one inch of lead in
taper on one or both ends.
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