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- Bearing
Surface Radial Slots
- Slots
that are milled perpendicular to the axis of the part
into the bearing surface.
- Body
Thickness
- A
reference dimension measured from the bearing surface
to the base of the collar on the top of a part.
- Broken
Corner
- Slight
chamfer at slot corners.
- Case-hardened
- A
process by which only the surface area of the part is
hardened to a specified depth.
- Case
Depth
- Depth
to which Rc 58 minimum is maintained.
- Chamfer
- An
external angular feature emanating perpendicular to the
axis of the part.
- Class
of Thread
- An
alphanumerical designation to indicate the standard grade
of tolerance and allowance
specified for a thread. (see also Thread
Fit)
- Collar
- A
circular boss on the bearing surface or the top surface
of a nut.
- Concentricity
- The
permissible variation in the location of the axis (exact
center) of a characteristic to the axis of another characteristic.
The axis of the controlled characteristic must remain
within a circular zone of a diameter equal to the concentricity
limit.
- Core
Hardness
- The
measurement of the hardness of the center of the wall
of a part.
- Counterbore
- A
concentric diametric enlargement of a hole for part of
its depth which forms an angular, radial or flat surface
at the bottom.
- Countersink
- An
angular beveling or flaring of the end(s) of a hole, outer
edge of a counterbore, or at the bottom of a counterbore,
that does not extend to the OD or counterbore diameter.
- EAU
- Estimated
annual usage.
- External
Groove
- A
circular continuous channel cut into an external feature
of a part.
- Face
Groove
- A
circular continuous channel cut into the bearing or top
surface of a part.
- Finish
- The
type of coatings, platings or treatments applied to the
final product.
- Flange
- A
circular projection forming the outside diameter of a
part.
- Flange
Thickness
- The
distance as measured from the flange bottom or bearing
surface of a part to the top of the flange,
including the chamfer or radii.
- Flatness
- The
permissible variation of the flatness of a surface or
characteristic.
- Hardness
- The
property of metals and their alloys relating to strength,
elasticity, and toughness and defined as the measurement
of its resistance to indentation. Through-hardened
parts are typically measured by the Rb, Rc or Brinell
scales. Case-hardened
parts usually have a hardness specified to a specific
depth.
- Horizontal
Slots on the OD
- Slots
that are milled parallel to the bearing surface of the
part into the OD.
- Induction
Hardened
- A
process by which only a designated surface, usually the
bearing surface, is hardened.
- Internal
Groove
- A
circular continuous channel cut into an internal feature
of a part.
- Lead
- The
axial distance between two consecutive points of intersection
of a helix by a line parallel to the axis of the cylinder
on which it lies, i.e., the axial movement of a threaded
part rotated one turn in its mating thread.
- Major
Diameter
- Diameter
of an imaginary cylinder that would bound the crests of
an external straight thread or the roots of an internal
straight thread.
- Material
- American
Iron and Steel Institute (AISI) number for the material
being used to manufacture the part (e.g., C12L14, C1137,
316SS, 4140).
- Micro
- The
measurement of the roughness of a surface in microinches
of roughness height.
- Minor
Diameter
- The
diameter of the threaded or unthreaded primary hole.
- Nominal
Size
- The
designation which is used for the purpose of general identification.
- Parallelism
- The
permissible variation of the parallel relationship of
the top surface diameter to the bearing surface diameter
of a part.
- Perpendicularity
- The
permissible perpendicular variation of relationship between
the bearing surface or the top surface and the axis of
the thread (A.k.a. runout or TIR).
- Pitch
- The
pitch of a thread having uniform spacing is the distance,
measured parallel to its axis, between corresponding points
on adjacent thread forms in the same axial plane and on
the same side of the axis. Pitch is equal to the
lead divided by the number of thread starts. (see Thread
Pitch)
- Pitch
Diameter
- In
thread geometry, the diameter of an imaginary cylinder
of such diameter and location of its axis that its surface
would pass through a straight thread in such a manner
as to make the width of the thread ridge and the width
of the thread groove equal. The pitch diameter is
located, therefore, midway between the sharp major and
sharp minor diameters of a given thread form.
- Radiused
Corner
- Slight
radii at slot corners.
- Round
Bottom
- Bottom
of the slot is rounded.
- Runout
- The
permissible perpendicular variation of relationship between
the bearing surface or the top surface and the axis of
the thread (A.k.a. TIR or perpendicularity).
- Tap
Size
- The
nominal major diameter as given in the thread designation,
of a threaded primary hole.
- Thickness
- The
distance from the bearing surface to the top surface measured
parallel to the axis of the part.
- Thread
Fit
- A
alphanumeric designation used to identify the extreme
permissible limits of the pitch diameter. Standard
thread fits for Industrial Nut Corp. would be '2B' for
inch threads and '6H' for metric threads.
- Thread
Handedness
- Whether
the threads are right-handed or left-handed in orientation.
- Threaded
Length
- The
depth to which the part is to contain fully formed threads,
not including the tapering off of the thread form for
threaded partial holes. For a through threaded part
this would equal the thickness of the part.
- Thread
Pitch
- The
number of threads per inch for inch threads, or the distance
between threads for metric threads. (see Pitch)
- Thread
Series
- Groups
of diameter/pitch combinations distinguished from each
other by the number of threads per inch applied to specific
diameters.
- Through-hardened
- A
process by which the entire cross section of the part
is hardened. A minimum core
hardness may be specified.
- TIR
- The
permissible perpendicular variation of relationship between
the bearing surface or the top surface and the axis of
the thread (A.k.a. runout or perpendicularity).
- Tolerance
- The
total amount of variation permitted for the size of a
dimension.
- Top
Radial Slots
- Slots
that are milled perpendicular to the axis of the part
into the top surface.
- Washer
- A
circular boss on the bearing surface or the top surface
of a nut.
- Width
Across Corners
- The
distance measured between two opposing corners of square,
hexagonal or octagonal parts, perpendicular to the axis
of the part.
- Width
Across Flats
- The
distance between two opposing sides of a square, hexagonal
or octagonal part.
- Wrenching
Thickness
- A
reference dimension equal to the body
thickness less the thickness of any washer, collar
or flange on the bearing surface of a part.
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