Profile of a Surface
20 X 20
A1
B
20 X 20
A3
20 X 20
A2
2 A B C
23.5
2 Wide Tolerance Zone
Size, Form and Orientation
23.5
Nominal
Location
The profile tolerance zone in this example is defined by two parallel
planes oriented with respect to the datum reference frame. The profile
tolerance zone is located and aligned in a way that enables the part
surface to vary equally about the true profile of the feature.
Profile of a Surface is a three-dimensional tolerance that can be applied
to a part feature in situations where the control of the entire feature
surface as a single entity is desired. The tolerance applies to the entire
surface and can be used to control size, location, form and/or orientation
of a feature surface.
Profile of a Surface
(Bilateral Tolerance)
20 X 20
A1
B
20 X 20
A3
20 X 20
A2
1 A B C
C
50
1 Wide Total
Tolerance Zone
0.5 Inboard
0.5 Outboard
50
Nominal Location
The tolerance zone in this example is defined by two parallel planes
oriented with respect to the datum reference frame. The profile tolerance
zone is located and aligned in a way that enables the part surface to
vary equally about the true profile of the trim.
Profile of a Surface when applied to trim edges of sheet metal parts will control
the location, form and orientation of the entire trimmed surface. When a
bilateral value is specified, the tolerance zone allows the trim edge variation
and/or locational error to be on both sides of the true profile. The tolerance
applies to the entire edge surface.
Profile of a Surface
(Unilateral Tolerance)
20 X 20
A1
B
20 X 20
A3
20 X 20
A2
0.5 A B C
C
50
0.5 Wide Total
Tolerance Zone
50
Nominal Location
The tolerance zone in this example is defined by two parallel planes
oriented with respect to the datum reference frame. The profile tolerance
zone is located and aligned in a way that allows the trim surface to vary
from the true profile only in the inboard direction.
Profile of a Surface when applied to trim edges of sheet metal parts will control
the location, form and orientation of the entire trimmed surface. When a
unilateral value is specified, the tolerance zone limits the trim edge variation
and/or locational error to one side of the true profile. The tolerance applies to
the entire edge surface.
Profile of a Surface
(Unequal Bilateral Tolerance)
20 X 20
A1
B
20 X 20
A3
20 X 20
A2
0.5
1.2 A B C
C
50
1.2 Wide Total
Tolerance Zone
0.5 Inboard
0.7 Outboard
50
Nominal Location
The tolerance zone in this example is defined by two parallel planes
oriented with respect to the datum reference frame. The profile tolerance
zone is located and aligned in a way that enables the part surface to
vary from the true profile more in one direction (outboard) than in the
other (inboard).
Profile of a Surface when applied to trim edges of sheet metal parts will control
the location, form and orientation of the entire trimmed surface. Typically when
unequal values are specified, the tolerance zone will represent the actual
measured trim edge variation and/or locational error. The tolerance applies to
the entire edge surface.
Profile of a Surface
0.5 A
0.1
Location &
Orientation
Form Only
25
A
0.1 Wide Tolerance Zone
25.25
24.75
Composite Profile of Two Coplanar
Surfaces w/o Orientation Refinement
