3Leader line
LeaderarrowØ 15±0.1 GN

SCS

Toleranced
featureTolerance symbol

LPGXGNGC
GG

Global Maximum: specification of tolerancezone as a maximum inscribed circle / maximum inscribed cylinder (MICI/ MICY).
Global Minimum: specification of tolerancezone as a minimum circumscribed circle /cylinder (MCCI/ MCCY).
Global Chebyshev: specification of tolerancezone as per the Chebyshev minimum zone
method (MZCI/ MZCY).
Global Gauss: specification of tolerance zone
as a Gauss best fit (LSCI/LSCY).

Datum is theaxis or midplane

LTolerance indicator
Datum A

Datum featureis the surface
line or surface

Toleranced
feature is thesurface line orsurface

Roundness (form tolerance): the tolerance zone is limited in thesection plane perpendicular to the measuring axis by two concentric circles a distance t apart.

t

Straightness (form tolerance): the tolerance zone is limited by- a cylinder of diameter t ( of an axis or derived median line)- two parallel planes a distance t apart ( of an edge)- two parallel lines a distance t apart ( of a surface line).
Cylindricity (form tolerance): the tolerance zone is limited by two
coaxial cylinders a distance t apart.
limits implicitly:

andaxis andsurface andtt

0.05

t

derived median line

SD

Statistical Mid-Range: mean valueof SX and SN

Additional information give rules for specification. Corresponding measuring
strategies can be derived from these:

ACS

Any Cross Section: specification in any (possible) circular section.

SCS

Specific Cross Section: specification only in the circular section (usually indicated by a theoretical dimension).

ALS

Any Longitudinal Section: specification in each (possible) longitudinal section.

CZ

Combined Zone: joint specification of the characteristics in acommon tolerance zone.

SZ

Seperate Zone: specification of the characteristics independently of each other (in separate tolerance zones).

TED

Theoretically Exact Dimension: theoretical dimension without
tolerance to indicate the ideal location, e.g. 25 or 60° .

Unlike form tolerances, location tolerances almost always require one or multiple datums:
Parallelism (orientation tolerance): the tolerance zone is limited by
two parallel lines or planes a distance t apart, which are parallelto the datum.
limits implicitly:
surface orderived median line/ axist0.08 AA

Perpendicularity (orientation tolerance): the tolerance zone is limited by two parallel planes a distance t apart (or a cylinder with Øt) which are perpendicular to the datum.
limits implicitly:
surface orderived median line/axis

E

Envelope requirement: as per ISO 8015, dimension tolerances andform and location tolerances must always be viewed independently ofeach other. By inputing E on the dimension tolerance, the entire tolerance width, including form deviations, are limited to the dimensional tolerance. Thus, in the example to the right, the external envelope(dimension+form) may not exceed the diameter of 6.0 mm. If this isalready utilized, e.g. by the dimensional tolerance, no more form deviations may occur.

0.05 AA

Angularity (orientation tolerance): the tolerance zone is limitedby two parallel planes a distance t apart (or a cylinder with Ø t)which are at the defined angle to the primary datum.
limits implicitly:
surface orderived median line/axis

FFree state: the tolerance of the (elastic or plastic, non-rigid) workpieceis defined in the unfixtured state (only formed by gravity), as per ISO
10579.

UZ

Ø 0.5 L0

Ø 6 - 1.0

OZ
P

Projected tolerance zone: the tolerance zone has been moved by t entirely outside of the workpiece in order to inspect the locations relevant forlater assembly.

60°

Ø4.5
L

Ø4.5

Ø6.0

Ø 0.5 M R0

Ø 6 - 1.0

Ø 6.5

Ø 6.5

B60°

E

Ø 6.0

Ø 6.0

E

Ø 6.0

Ø 5.5

Ø 0.01 A

A50

Symmetry (location tolerance): the tolerance zone is limited by
two planes symmetrical to the datum axis or datum plane at adistance t apart.
limits implicitly: center plane center plane if applicable center planeA

0.08 At

Coaxiality or concentricity (location tolerances): the tolerance zone
is limited by a cylinder or circle of diameter t which is coaxial orconcentric to the datum.
Coaxiality limits implicitly: axis axis concentricity
Line profile (profile tolerance with and without datum): the tolerance zone is limited by two curves which envelop circles ofdiameter t whose mid-points are on a line of geometrically ideal
form. If applicable: a datum limits the position

A0.03 AAøtt

Circular radial or axial run-out (run-out tolerances): the tolerancezone is limited by two concentric circles or parallel planes a distance t apart, which are located by datum A-B.
Circular radial run-out limits:
Circular axial run-out limits:measuring line

PL

Plane: datum feature only functions as a plane. Other parameters of thedatum feature (e.g. origin coordinates) are not considered.

SLStraight Line: datum feature functions only as a straight line. Other parameters of the datum feature (e.g. origin coordinates) are not considered.

PT

Point: datum feature functions only as a point. Other parameters of thedatum feature (e.g. orientation information) are not considered.

B

Orientation Plane indicator: Indicates an additional orientation of thetolerance zone. In the example to the right, the parallelism is only toleranced parallel to the datum B.

Ø 0.03 AA

0.08 A

Surface profile (profile tolerance with and without datum): thetolerance zone is limited by two surfaces which envelop spheresof diameter t whose mid-points are on a surface of geometricallyideal form. If applicable: a datum limits the location.

><0.1 A-BAB

6x30

B0.1 P A B

A0.1 A-BtA

B

GPS – Geometric Product Specifications

Ø 0.2 A ><GSGaussian filtering: the standard Gaussian filter must be used asa digital filter. The indication "G15–" means a low-pass filter
with 15 waves per revolution. "G150–50" would be a band-passFFourier analysis: the evaluation is performed using Fourier analysis. Here "F3" limits the analysis to the third harmonic vibration(orbiform curve form).

0.6 A[SL] ...
A

12°

0.03 A

Intersection plane indicator: Specifies the section plane in which the tolerance is defined In the example, parallelism is only toleranced perpendicular to B.

Spline filtering: the spline filter must be used as a digitalfilter. The indication "S50–" means a low-pass filter, "S150–50"
means a band-pass filter with 50-150 waves per revolution.

BK LContinuously variable tolerance zone: the tolerance width changes from
0.3 mm (with K) linear up to 0.5 mm (with L).

t/...

Tolerance zone limitation: the tolerance must contain the value 0.5 inevery section of the length 100 (in the example to the right).

0.5 / 100All Around: the profile tolerance applies to all line and surface features
surrounding the entire workpiece in the viewing plane.

0.03

Collection Plane: the collection plane defines, in connection with the „All
around“ symbol, a set of individual geometry elements that are toleranced together.
All Over: the profile tolerance applies to all (marked) line and surface
features surrounding the entire workpiece.

There is additional information on geometric product specifications (and the differences to the ASME
standardization) in the seminars and books of theZEISS Metrology Academy. Books can be ordered
here: shop.metrology.zeiss.com

GPS – tolerances of form, orientation, location and run-out
GPS – Profile tolerancing
Form and position tolerancing, maximum material requirement
GPS – Position tolerancing
GPS – Datum and datum systems
GPS – Geometric tolerancing – Fundamentals –Concepts, principles, rules
GPS – Dimensioning and tolerancing – non-rigid parts
GPS – Cylindricity
GPS – Roundness
GPS – Straightness
GPS – Flatness
GPS – Dimensional tolerancing – part 1: linear dimensions
GPS – Dimensional tolerancing – part 2: dimensions otherthan linear sizes

B

0.03 AKK

ISO 1101
ISO 1660
ISO 2692
ISO 5458
ISO 5459
ISO 8015
ISO 10579
ISO 12180
ISO 12181
ISO 12780
ISO 12781
ISO 14405-1
ISO 14405-2

K L

B

T

Tangential feature: the toleranced feature is defined as an external tangential feature (as per the Chebyshev minimum method)(OTPL).

Important ISO standards for
the GPSTolerance zone limitation: the tolerance must be observed only in thearea between K and L.

B

Minimum feature: the toleranced feature is defined in accordance with the Chebyshev minimummethod (MZCI/MZCY).

A

Datum and tolerance direction limitations
Datum feature only acts as an orientation feature. The position coordinates are not considered.

GGaussian feature: the toleranced feature is defined as a Gaussian best fit (Gauss circle / Gausscylinder) (LPCI/LPCY).

C0Ø 6 - 1.0 E

Ø 0.2 AØ 0.2

NCircumscribed feature: the toleranced feature isdefined as a circumscribed circle / circumscribedcylinder (MCCI/ MCCY).

Ø 0.5

0.1 A BAX

Inscribed feature: the toleranced feature is defined as an inscribed circle / inscribed cylinder(MICI / MICY).

L

Ø5.0

Asymmetric tolerance zone (with profile form tolerances): the tolerancezone is shifted by the value t from the material center outwards (in theexample to the right, the zone is entirely outside of the material).
Asymmetric tolerance zone (with profile form tolerances): the tolerancezone is shifted by a non specified value away from the material center. SoOZ (offset zone) only tolerances form, location and orientation, not size.

In addition, indications can be made in the tolerance indicator for the association (calculated best fit) of the features and for filtering, e.g. 0.1 X G50– A
or 0.1 N S150–50 or 0.1 F3 . The following applies:Ø6.5tPosition (location tolerance): the tolerance zone is limited by acylinder in nominal position (for position with Ø sign). For additional tolerancing, see ISO 5458.
limits implicitly:, if applicable also
and plane

Total radial or axial run-out (run-out tolerances): the tolerancezone is limited by two coaxial cylinders or parallel planes a distance t apart, which are located by datum A-B.
.
Total radial runout limits:
Total axial run-out limits:

AAxis as a toleranced feature: to illustrate that not the surface but rather
the axis or center plane (center line) should be toleranced, a A can be
input in the drawing (in 3D drawings necessary).

t

100

SR

Statistical Range: range of themeasured values

R

Reciprocity requirement: the R-requirement enables the "reversal" of Mor L , i.e. the addition of unused form and location tolerances to thedimension tolerance.

surfacet

SM

Statistical Median: median of themeasured values

Minimum material requirement: L enables the addition of unused dimension tolerance portions (away from the material side) to the toleranced form or location error.
Example (simple case): cylinder diameter 6 mm and axis straightness tolerance t = 0.5 mm (see image to the right). If the actual diameter is 6.0mm, the straightness of the axis can deviate up to 1.5 mm.

0.05

Flatness (form tolerance): the tolerance zone is limited by twoparallel planes a distance t apart.
surface or0.03

øtSA

Statistical Average: mean value ofthe measured values

Ø6.5

Ø6.00.02

øSN

Statistical Minimum: smallest value of the measured values

MØ5.0

Toleranced feature is the axis
or mid-plane

So-called rank-order sizes can be indicated as a supplement to the modifiers:SX0Ø 6 - 1.0

M

0.1 A

limits implicitly:

Statistical Maximum: largest valueof the measured values

Ø 0.5 M

Tolerance value

DatumfeatureLocal Point: specification of tolerance as atwo-point dimension (based on the midpointof a Gaussian circle)

M

Form tolerances limit the deviations of an individual feature from its geometrically ideal form. Orientation, location and runout tolerances limit the errors of the mutual location of two or more features. Oneor more features can be specified as datum features.

Maximum material requirement: M permits the addition of unused dimension tolerance portions to the toleranced form or location error.
Example (simple case): cylinder diameter 6 mm and the axis straightness
tolerance t = 0.5 mm (see image to the right). If the actual diameter is
5.0 mm, the straightness of the axis can deviate up to 1.5 mm.

Tolerance indications for
associations and filters

L0.5AD

Altered Default: If a different standard or work standard becomes applicable for a technical drawing in addition to the GPSstandards (or if these are replaced), this can be performed in thetolerance box by adding the " AD Name of the particular standard."

L
0.3 - 0.5

0.3 A

B

0.03

Carl Zeiss Industrielle Messtechnik GmbH73446 Oberkochen/Germany
Phone: +49 (0) 7364/ 20-6336
Fax:+49 (0) 7364/ 20-3870
Email: info.metrology.de@zeiss.com
Internet: www.zeiss.com/imt

EN_60_050_0012VI Printed in Germany. CZ-VIII/2023 © Carl Zeiss Industrielle Messtechnik GmbHZEISS endeavors to ensure that all information is correct. However, the accuracy of the information cannot be guaranteed and ZEISS assumes no liability regarding the accuracy or completeness of the information.

Ø 15 ±0.1 GN ACS 0.05 SR

Additional drawing entries

20Sizes are dimensions of enclosed geometric features, e.g. diameter ofcylinders and circles or distances of parallel surfaces. The type of tolerance
specification can be stipulated here by indicating modifiers.

Form and location tolerances

PSizes and modifiers