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Define Perpendicularity

• Perpendicularity is the condition that results when a

surface, axis, or center plane is exactly 90 deg to a datum.• A perpendicularity control is a geometric tolerance that

limits the amount a surface, axis, or center plane is

permitted to vary from being perpendicular to the datum.

Perpendicularity Applications

• Perpendicularity applied to a surface.

• Perpendicularity applied to a planar FOS.

• Perpendicularity applied to a cylindrical FOS.

Perpendicularity Tolerance Zones

• Two Parallel Planes

• A cylinder 

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Perpendicularity applied to a surface

Interpretations:• Tolerance zone

 –two parallel planes that are perpendicular to the datum

plane.

• Distance between tolerance plane  – specified tolerance value.

• Important criteria  – all elements of the surface must be within the tolerance

zone.

• Perpendicularity tolerance zone limits the flatness of toleranced feature.

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Inspection of perpendicularity

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Perpendicularity with multiple datums

Interpretations

• Tolerance zone –

two parallel planes that are perpendicular to thedatum plane.

• Distance between tolerance plane  – specified tolerance value.

• Important criteria  – all elements of the surface must be within the

tolerance zone.

•

Perpendicularity tolerance zone limits the flatness of tolerancedfeature

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Perpendicularity control that contains MMC modifier 

Slot

AME

Perpendi

cularity

tolerance

Bonus

tolerance

Tolerance

Zone Ø

6.4 0.1 0.0 0.1

6.5 0.1 0.1 0.2

6.6 0.1 0.2 0.3

6.7 0.1 0.3 0.4

6.8 0.1 0.4 0.5

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Dia AMEPerpendicularity

tolerance

Bonus

tolerance

Tolerance

Zone Ø

50.2 0.05 0.0 0.05

50.1 0.05 0.1 0.15

50.0 0.05 0.2 0.25

Perpendicularity control with MMC

modifier applied to cylindrical FOS

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Interpretations

• Tolerance zone  – two parallel planes that are

perpendicular to the datum plane.

• Distance between tolerance plane  – specified tolerancevalue.

• Important criteria  – all elements of the surface must bewithin the tolerance zone.

• Tolerance zone is oriented relative to the datum planeby a basic angle.

• Angularity tolerance zone limits the flatness of toleranced feature

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Angularity control applied to a diametrical FOS

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Parallelism Control

• Parallelism is the condition of a surface, center plane, or axis

being exactly parallel to the datum.

•  An parallelism control is a geometric tolerance that limits the

amount a surface, center plane, or axis is permitted to vary from

being parallel to the datum.

Parallelism Applications

• Parallelism applied to a surface.

• Parallelism applied to a cylindrical FOS.

Parallelism Tolerance Zones

• Two parallel planes.

•  A cylinder.

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PARALLELISM

ZONE OF TOLERANCE :- CYLINDER

SYMBOL :-

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Parallelism Applied To a Surface

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Dia

AME

Perpe

ndicu

larity

tolera

nce

Bonu

s

tolera

nce

Toler

ance

Zone

Ø

8.0 0.2 0.0 0.2

8.2 0.2 0.2 0.4

8.4 0.2 0.4 0.6

Parallelism Applied to a FOS at MMC

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