LEAD ACCURACY
Measured in inch/inch or m/25mm. See Materials
and Manufacturing Processes for additional screw lead accuracy
specifications.
STARTS
The integral number of helical thread elements on the screw shaft.
BALL
CIRCLE DIAMETER
The diameter of the circle generated by the center of the bearing
balls.
LEAD
The distance the nut advances in one revolution (lead = pitch x
number of starts).
ROOT
DIAMETER
The diameter of the screw at the bottom of the thread groove.
NOMINAL
BALL DIAMETER
The approximate diameter of the load carrying balls contained in
the ball nut.
SCREW
WEIGHT/MASS
Measured in lbs/ft for inch screws and in g/m for metric screws.
Ball
Nut Style Heading
The style of nut is identified in the drawing heading, refer to
additional nut style description.
Ball
Nut Threads/Materials
All screws have an alloy steel right hand threaded nut and many
sizes have an alloy steel left hand threaded and a stainless steel
right hand threaded nut.
BALL
NUT QUANTITY
Ball quantity and size are nominal and may vary per nut.
LOAD
CAPACITY
Measured in lbs. or N, this is the dynamic and static load rating
of the nut.
Torque
To Raise
A linearly scalable value measured by in.-lb./lb. or N.m/kN. This
is the torque required to keep one pound or one kN of load in motion.
Ball
Nut Weight, Ball Nut, Flange and Wiper Kit Part Numbers
Wiper Kits are available for most nuts.
Spring
Rate/Preload Range Nuts
which feature a preload have the spring rate or preload range listed.
See additional description for preload ball nuts.
WIPER
TYPE
Some nuts include integral wipers which are either Elastomer, Felt
or Brush.
WIPER
KIT
Felt or Brush kits are available for most ball nuts.
STANDARD
SCREW THREADS, LENGTHS AND mATERIALS
All screws are available in alloy steel with right hand
threads. Many sizes are also available with left hand threads or
in stainless steel with right hand threads.
Standard cut lengths are available for each
screw size, custom cut screws up to 288" are available. Custom
Screws over 288" can be manufactured based on material availability.
See the Reference Number Configurator for additional explanation
on specifying a custom length screw.
Standard rolled screw length part number product
or unmachined cut to length material may have approximately one
inch of lead in taper on one or both ends, ground screws up to 3"
unthreaded portion.
FLANGES
are made of black oxided steel. Flanges are manufactured
to be pinned to the ball nut. See additional pinning information.
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