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Tolerance Limit
The variation, positive or negative, by which a size is permitted to depart from the design size.
Actual Size
A measured size.
Limits of Size
The maximum and minimum sizes permitted for a feature.
Nominal Size
Size designation used for the purpose of general identification.
Basic Size
Size from which the limits of size are derived by the application of allowances and tolerances.
Datum
Theoretically exact surface, plane, axis, center plane, or point from which dimensions for related features are established.
Tolerance
The difference between the maximum and minimum size limits on a part.
Design Size
The basic size with allowance applied.
Specified Dimension
part of the dimension from which the limits are calculated.
Locational Clearance Fits
The standard fit LC, stands for what?
Zero Line
Line of zero deviation and represents the basic size.
Fit
The general term used to signify the range of tightness that may result from the application of a specific combination of allowances and tolerances in the design of mating parts.
Actual Fit
The relation between two mating parts with respect to the amount of clearance or interference that is present when they are assembled.
Transition Fit
The relationship between assembled parts when either a clearance or an interference can result, depending on the tolerance conditions of the mating parts.
Locational Transitional
The standard fit LT, stands for what?
Upper Deviation
The algebraic difference between the maximum limit of size and the corresponding basic size.
Allowance
prescribed difference between the maximum material limits of mating parts. The minimum clearance and maximum interference between such parts.
Running or Sliding
The standard fit RC, stands for what?
Maximum Material Condition
limit of size that provides the maximum amount of material for a part
Bilateral Tolerance
A tolerance in which variation is permitted in both directions from the design size.
Feature
Any physical portion of an object such as a surface or hole.
Locational Interference fit
The standard fit LN, stands for what?
Fundamental Deviation
That one of the two deviations closest to the basic size.
Dimension
Geometrical characteristic such as diameter, length, angle, or center distance.
Force or Shrink Fit
The standard fit FN, stands for what?
Least Material Condition
limit of size that provides the minimum amount of material for a part
Lower Deviation
the algebraic difference between the minimum size limit and the basic size
Unilateral tolerance
A tolerance in which variation is permitted in only one direction from the design size
Real surface obtained by instrumental or other means-definable
MEASURED
Profile of nominal surface
NOMINAL PROFILE
Actual or deviation from nominal
REAL
Representation of a measured real profile
MEASURED PROFILE
Profile of a real surface
REAL PROFILE
Average spacing between adjacent peaks
ROUGHNESS SPACING
Topography obtained by filtering out waviness
ROUGHNESS TOPOGRAPHY
Measurements of profile in a direction normal or perpendicular to the nominal profile
HEIGHTS
Obtained the same way as measured, but filters are added to pinpoint certain characteristics
MODIFIED PROFILE
Contour of surface measured normal or perpendicular to surface-unless specified
PROFILE
Measured profile with waviness filtered out
ROUGHNESS PROFILE
Measured profile with exaggeration of height or space without filtering
TOTAL PROFILE
Boundary of an object that separates that object from another object, Substance or space-area
SURFACE
Unintentional, unexpected, and unwanted interruptions in the topography
FLAWS
Fine irregularities of the surface texture resulting from the production process or material condition
ROUGHNESS
Topography obtained by measurement
MEASURED TOPOGRAPHY
Deviation from the nominal surface
ERROR OF FORM
Intended surface contour, shape and extent- perfect word
NOMINAL
Repetitive or random deviations from real
SURFACE TEXTURE
Profile with roughness and part form parameters removed
WAVINESS PROFILE
Nominal space measured for surface characteristics
SAMPLING LENGTH
Direction of predominant surface pattern
LAY
Dist. between specific points on a profile measured parallel to the nominal profile
SPACING
Parallel line to profile from which deviations are measured
MEAN LINE
Point of maximum height on that portion of a profile that lies above the meal line and between two intersections of the profile with the mean line
PEAK