GEOMETRICAL TOLERANCING ON TECHNICAL DRAWINGS - PART 1 TOLERANCING OF FORM, ORIENTATION, LOCATION AND RUN-OUT, AND APPROPRIATE GEOMETRICAL DEFINITIONS

Oct 29, 2026

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Practical guidance for providing geometrical tolerancing on technical drawings, aligning with the regime of access to information and the timely dissemination of accurate public standards. Defines tolerancing concepts used to control form tolerances as deviations from ideal placement, and orientation, location, and run-out tolerances governing mutual relationships between features. Includes standardized terminology and symbols, with examples of indications and interpretation, explanation of datum features, leader lines, tolerance zones, and values expressed in millimetres.

LanguageEnglish

CategoryTechnology

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Pages31

Reading Time1 h 18 min

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GEOMETRICAL TOLERANCING ON TECHNICAL DRAWINGS

PART 1 TOLERANCING OF FORM, ORIENTATION, LOCATION AND RUN-OUT, AND APPROPRIATE GEOMETRICAL DEFINITIONS

Form tolerances

Orientation, location and run-out tolerances

Symbols and toleranced characteristics

Examples of indication and interpretation

★★★★★☆★☆★ ★☆★★ ★★ Whereas the Parliament of India has set out to provide a practical regime of right toinformation for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,and whereas the attached publication of the Bureau of Indian Standards is of particular interestto the public,particularly disadvantaged communities and those engaged in the pursuit ofeducation and knowledge,the attached public safety standard is made available to promote thetimely dissemination of this information in an accurate manner to the public. “可市3faT,付市T 3faT” “ 市羽市R4”Jawaharlal Nehru“Step Out From the Old to the New” Mazdoor Kisan Shakti Sangathan“The Right to Information,The Right to Live” IS 8000-1(1985):Geometrical tolerancing on TechnicalDrawings,Part 1:Tolerances of form orientation,locationand Run-out and appropriate geometrical definitions [PGD 24:Drawings] # “可可HT可fnT”Satyanarayan Gangaram Pitroda“Invent a New India Using Knowledge” Aet.Nwmber.22f.a5Zhe.Indin.ParliamenMade Available Byade Available BBIGHT TO INFORMATIo “可可 e国sT言可市P 可cT言”Bhartrhari—Nitisatakam“Knowledge is such a treasure which cannot be stolen” BLANK PAGE # GEOMETRICAL TOLERANCING ONTECHNICAL DRAWINGS PART 1 TOLERANCING OF FORM,ORIENTATION,LOCATIONAND RUN-OUT,AND APPROPRIATE GEOMETRICAL DEFINITIONS (First Revision) (ISO Title :Technical Drawings—Geometrical Tolerancing一Tolerancing of Form,Orientation,Location and Run-Out—Generalities,Definitions,Symbols,Indications on Drawings) Second Reprint AUGUST 1996 UDC 74443:621753°1 J ◎ Copyright 1987 BU REAU OF INDIAN STANDA RDSMANAK BHAVAN 9 BAHADUR SHAH ZAFAR MARGNEW DELHi 110002 April 1987 | Technical drawings-Geometrical tolerancing-Tolerancod
characteristics and symbols-Examples of indicatlon and
interpretation | | | | | | Extract from
1101
International Standard | | | --- | --- | --- | --- | --- | --- | --- | --- | | This document forms an extract of ISO 1101,suitable for everyday use.
The geometrical tolerance applies always to the whole extent of the
toleranced feature unless otherwise specified,for example 0,02/50 in-
dicates that a tolerance of 0.02 is permitted for an extent of 50 at any
Form tolerances limit the deviations of an individual feature from its ideal
place on the toleranced feature.
geometrical form.
When a geometrical tolerance applies to an axis or a median plane,then
the arrow of the leader line terminates at the dimension line (figure 4).
Orientation,location and run-out tolerances limit the deviations of the
mutual orientation and/or location of two or more features.For func-
When a geometrical tolerance applies to aline or surfaceitself,then the
tional reasons one or more features may be indicated as a datum.f
leader line with its arrow terminating on the contour of the feature has to
necessary,a geometrical tolerance should be specified to the datum
be clearly separated from the dimension line (figure 5).
feature in order to ensure that the datum feature is sufficiently exact for
its purpose.
The same method of indication is used for the datum triangle.
Datum letter
Datum lettor
Leader line-
Refers to the
Theoretically
Refert to the
generating line
axis or the
Datum triangle
●Xoct
Arrow
Tolerance value
or the surace
Datum feature
Toloranced-
median plane
dimension
Tolerance symbol
feature
Figure 3
Figure 1
Figure2
Figure 5
Figure4
Maximum material
Datum target
Projected tolerance
Figure 7 P
Figure 6
Flgure 8
(see ISO 5459)
condition (MMC)
zone
Values in milimetres | | | | | | | | | Symbols and toleranced characterlstics | | | | E

FAQs

What do form tolerances control on technical drawings?

Form tolerances limit the deviation of an individual feature from its ideal place on the toleranced feature.

How do orientation, location and run-out tolerances function?

They limit deviations of the mutual orientation and/or location of two or more features, including cases where functional requirements may require specifying a datum.

What information do the standard symbols and tolerance zones provide?

They define how toleranced characteristics are represented, including tolerance frames, datums, leader line indications, and interpretation of tolerance zones and values (in millimetres).

Oct 29, 2026

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