Carryover/Frozen: Tolerances For Dimensions and General Requirements and [PDF]

Zitiervorschau

BONGIOVANNI DOMENICO - [email protected] Supervisor FCA ITALY -- ENGINEERING METHODS & TOOLS - BUSINESS ME ... Supervisor department

DELLA CASA MARCO - [email protected] Author FCA ITALY -- ENGINEERING METHODS & TOOLS - BUSINESS ME ... Author Department

General requirements and tolerances for dimensions and geometric and dimensional features without indications on drawing.

Doc. No. 01444 FCA Italy Class: TFO FCA US Doc. Type: Date: 03-OCT-2013

CARRYOVER/FROZEN

change level: 15

This standard is being phased out and shall be used on carryover parts/programs only.

If there is a new document to refer to, that document number is: CS.00022, CS.00062

DO NOT USE THIS STANDARD ON NEW PARTS/PROGRAMS or add this standard as a change to any model. This standard may be retained on CATIA/NX models revisions, if it was included at the beginning of the program. Contact the originating department identified with this standard for the proper replacement standard. Comments from author: Vale per i disegni legacy - per i nuovi vale la CS.00022

ANY PRINTED COPY IS TO BE DEEMED AS UNCHECKED; THEREFORE THE UPDATED COPY MUST BE CHECKED IN THE APPROPRIATE WEB SITE CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FCA ITALY S.P.A.. IN CASE OF DISPUTE, THE ONLY VALID REFERENCE IS THE ENGLISH EDITION

Fiat Group Automobiles NORMAZIONE

GENERAL REQUIREMENTS AND TOLERANCES FOR DIMENSIONS AND GEOMETRIC AND DIMENSIONAL FEATURES WITHOUT INDICATIONS ON DRAWINGS

DESIGN STANDARD

01444 Page:

Sheet 1/14 1

PURPOSE OF THE STANDARD

Edition

15 Ch.

To simplify references in technical documentation by providing general requirements for tolerances without indication on drawings, with particular reference to linear and angular geometric and dimensional features. To simplify technical drawings while guaranteeing uniform assignment of required tolerance values.

B

Code

TFO

Date: 10/03/2013

Date

= A B = = =

June '85 Feb '87 March ’87 Oct. ’69 02/03/04 03/12/04

A = = A B

06/25/04 07/21/08 03/22/10 05/19/10 10/03/13

Description

Edition 10 N --

Edition 11 -Edition 12 -Edition 13 --

Edition 14 -Edition 15 -Edition 15 Edition 15

Previous edition completely rewritten (was Ed. 9 Ch. A). Added § 1.11. Cancelled § 1.6 (Off-the-shelf part tolerances) and changed § 1.5. Changed § 1.5 and 1.10. Grouped Std. 01455, 01455/01 and 01455/02 together. Changed § 1.4, § 1.5, § 1.6, § 5 and § 9 and added § 3.1, § 3.2 and § 6. Changed § 1.5 and added § 1.11. Changed § 1.11. Changed § 1.5 and added § 2.1. Changed Annex 2. Changed § 2: Standard 01304 Suppressed and Repalced (UNI 3975 / 4820 / 3974 / 73)

(AF) (AF) (AF) (AF) (FD) (FD) (FD) (FD) (CL) (CL) (CL) (LL)

ANY PRINTED COPY IS TO BE DEEMED AS UNCHECKED; THEREFORE THE UPDATED COPY MUST BE CHECKED IN THE APPROPRIATE WEB SITE
 


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CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

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1 REQUIREMENTS AND REFERENCES 1.1 Dimensions All dimensions are expressed in millimetres (mm) unless otherwise specified. 1.2 Symbols Std. 01366/01 1.3 Surface roughness Std. 01370 1.4 Shape tolerance

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

Std. 01376 and 01377 1.5 Maximum allowed dimensional and shape errors for dimensions without indication on drawings -miscellaneous parts: S see Std. 01460 (for documents issued before 03/01/1983) S see § 3 (for documents issued after 03/01/1983) -for bolts: Std. 01481, 01380, 01390 and 01307 -for threaded holes: Std. 01560, Spec. 9.52605/01 -for body parts: Std. 00237 -for surfaces and edges of doors and lids to be assembled with flanging in coupling areas: Std. 00237 -for shape and dimensions of tabs for body part joints obtained by slide bending: Std. 00216 -for shape and dimensions of tabs for body part joints obtained by shearing or trimming: Std. 00217 -for tolerances of single pressed body parts: Std. 00237 -for mobile body couplings nominal gap and profile tolerances: Std. 80035, 80084 and 80087 -for dimensional and shape tolerances of windscreen, rear window and fixed side window seats: Std. 80039 -for body holes and surfaces for primary and complementary references: Std. 00285 -for body holes and slots: Std. 01328 -for body part dimensional tolerances in terms of surface profiles, contour profiles and correlated profiles: Std. 00223 1.6 References according to Fed. Std. 302 and ISO 3795 For evaluating fire resistance of non-metallic materials for parts fitted inside the passenger compartment: Std. 7-G2000.

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Fiat Group Automobiles

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1.7 Quality of supplies See Spec. 9.01102. 1.8 Product classification and features (Criteria to be adopted by FIAT Design) See Spec. 9.01102/10 and Std. 00160. 1.9 Components subject to legal requirements See Std. 01930. 1.10 Components with "Report" features See Spec. 9.01120. 1.11 Requirements for all tolerances indicated on drawings Tolerances indicated on drawings for all features are 4σ (see Spec. 9.01102/08). Report features are an exception and are 5σ. In this manner, 1.33 results for capability targets and 1.67 for report features. 2 INTRODUCTION The standards listed in the Table in § 10 specify the dimensional and geometric tolerances (shape, position, orientation and run-out) allowed for features shown on drawings without explicit tolerance requirements. Tolerance of functionally important features must be explicitly indicated on drawings even if it corresponds to the requirements stated in these standards.

Lower geometric tolerances (if necessary) or higher tolerances (if allowed) must be indicated one by one according to Std. 01376. The tolerances required in this standard may be adopted for finished parts obtained by chip removal or by plastic deformation providing no other tolerance standards for specific production processes exists. Application for parts obtained in different manner is possible after ascertaining that the degree of accuracy complies with the requirements of this standard. Required tolerances apply if this standard is quoted on drawings or in respective documentation. Other tolerances established in other standards, if any, will only apply if they are quoted on drawings or in respective documentation. The standard with higher tolerance will apply in case of doubt concerning linear or angular dimensions. Supplementary requirements are established for coupling in this standard.

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CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

This standard establishes four degrees of accuracy for linear and angular dimension tolerances. The choice of one of these degrees must take the accuracy normally adopted in workshops into account.

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Geometric tolerances do not apply in the following cases: a) parts for which geometric tolerances are indicated separately b) parts for which other geometric tolerances are indicated on drawings or in respective documentation c) parts which are not made by stock removal as shown by an indication for semi-finished parts on drawings. Geometric tolerances for any line and any surface are not specified in this standard. Tolerances for linear and angular dimensions apply in the following cases: d) external and internal linear dimensions, thrusts, diameters, distances (see Table 1); curvature radii and chamfer heights (inclinations) (see Table 2) e) angular dimensions (see Table 3) both indicated or normally not indicated (e.g. 90 angles or regular polygonal angles) f) linear and angular dimensions which are obtained by machining joined parts g) linear and angular dimensions of mechanical parts joined by welding. Tolerances for linear and angular dimensions do not apply in the following cases: h) linear and angular dimensions for which tolerances are indicated one by one linear and angular dimensions for which standards related to other general tolerances are indicated on drawings or in other documentation (see page 2) j) auxiliary dimensions indicated in brackets (UNI 3975 / 4820 / 3974 / 73) k) theoretical dimensions indicated in a box (Std. 01376) l) circumference subdivision angular dimensions m) right angles between axes crossing in absence of explicit angular dimension (90) n) linear and angular dimensions which are obtained by connecting parts CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

i)

2.1 GENERIC TOLERANCES FOR PRESSED STEEL/COLD ROLLED PARTS (ANNEX 1) AND HOT ROLLED PARTS (ANNEX 2) NOT INDICATED ON DRAWINGS All tolerances which are not indicated on drawings are generic. The values of these tolerances are indicated below and apply to the following families: 1- part or complete part with standard components indicated 2- assemblies formed by several parts in item 1 made integral to each other by welding, clinching or by means of threaded fasteners. Note: In order to avoid misunderstandings, e.g. by suppliers engaged in sourcing technical analyses, it is important to note that the division into two families of parts indicated above encompasses all types and that all analysed components must be referred to either family. This distinction is prevalent over the wording in the title box, such as part, complete part, assembly, intermediate assembly etc. The use of this wording is persistent because it is useful for collocating the parts in specific FGA production process steps.

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ANNEX 1 1 ALLEGATO

Generic geometric tolerances for cold pressed parts Tolleranze geometriche generiche per stampati a freddo See Std. 0023700237 Vedi norma

ELEMENTO COMPLETO constandard componenti COMPLETE PART with standard components riportati : indicated:

See Std. 0023700237 Vedi norma

Tolleranzefor per Tolerances standard componenti standard indicated components

1.4 X Y Z

riportati :

2 / 100

2

X

Y Z

2

X

Y Z

2

X

Y Z

X

Y Z

ASSEMBLIES: COMPLESSIVI (C.S.) :

Tolleranzefor per Tolerances standard componenti standard indicated components riportati :

2 2 / 100

laying piano di plane giacenza

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piano layingdi giacenza plane

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

PART: : ELEMENTO

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Sheet Fiat 1Group Automobiles

ANNEX 2

Generic geometric tolerances for hot pressed parts CLASS A HOLE

PART:

CLASS B HOLE

SEAL RETAINING TABS

CLASS A HOLE CLASS B HOLE

COMPLETE PART with standard components indicated: SEAL RETAINING TABS

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

Tolerances for standard indicated components

laying plane

ASSEMBLIES:

Tolerances for standard indicated components laying plane

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Page 7 Change B

Sheet 1

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3 DIMENSIONAL TOLERANCES FOR FEATURES WITHOUT TOLERANCE INDICATION AND FOR LINEAR AND ANGULAR DIMENSIONS The dimensional tolerances required in the standards listed in § 10 do not apply to boxed dimensions (Std. 01376) and to the auxiliary dimensions given by way of example only. They additionally apply to dimensions obtained from drawing dimensions determined by calculations or from records. Tolerances are specified according to final machining of the features which delimit the dimensioned feature. If the dimension is delimited by two surfaces obtained with final machining for which different tolerances are required (according to these standards), the required tolerance is that of the machining degree with the broadest tolerance for both surfaces. For example, in case of nominal dimension between a rough cast surface and a milled surface, the tolerance for rough cast surfaces is determined for both.

3.1 Linear dimensions Table 1 Deviations for linear dimensions, excluding curvature radii and chamfer heights

Degree of accuracy

≥0.5

≥3

≥6

≥30

≥120

≥400

≥1000

≥2000

≥4000

≥8000

≥12000

≥16000

≤3

≤6

≤30

≤120

≤400

≤1000

≤2000

≤4000

≤8000

≤12000

≤16000

≤20000

A (accurate)*

±0.05

±0.05

±0.1

±0.15

±0.2

±0.3

±0.5

±0.8

-

-

-

-

B (average)*

±0.1

±0.1

±0.2

±0.3

±0.5

±0.8

±1.2

±2

±3

±4

±5

±6

C (rough)*

±0.15

±0.2

±0.5

±0.8

±1.2

±2

±3

±4

±5

±6

±7

±8

-

±0.5

±1

±1.5

±2

±3

±4

±6

±8

±10

±12

±12

D (very rough)

Deviations must be indicated directly on the nominal dimensions for dimensions smaller than 0.5 mm. * See §6

Table 2 Deviations for curvature radii and chamfer height Deviations in mm for nominal dimension range in mm Degree of accuracy

A (accurate) B (medium) * C (rough) D (very rough)

≥0.5

≥3

≥6

≥30

≥ 120

≤3

≤6

≤30

≤120

≤400

± 0.2

±0.5

±1

±2

±4

±0.2

±1

±2

±4

±8

Deviations must be indicated directly on the nominal dimensions for dimensions smaller than 0.5 mm.

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Deviations in mm for nominal dimension range in mm

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3.2 Angular dimensions Tolerances for angular dimensions apply regardless of the actual dimensions of the part, i.e. the angular deviations must appear for parts in both maximum material condition and for parts in minimum material condition. Dimensional deviations do not limit shape errors of sides or surfaces which form an angle. Angular deviations are given (see Table 3) according to the nominal dimension of the shorter side.

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

NOTE: The orientation of lines or planes forming the angle in parts with shape errors is that of the ideal lines or planes as defined in Std. 01376.

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Table 3 Deviations for angular dimensions Deviations in angular units for dimensional ranges of the shortest side ** in mm

Degree of accuracy

≥ 10

≥ 50

≥ 120

≤ 50

≤ 120

≤ 400

± 1°

± 30'

± 20'

± 10'

± 5'

± 1° 30'

± 50'

± 25'

± 15'

± 10'

± 3°

± 2°

± 1°

± 30'

± 20'

≤ 10 A (accurate) B (medium) * C (rough)* D (very rough)

≥ 400

** Dimension l1 (for angle ) and dimension l2 (for angle ) must be taken as the shortest side of the angle. * See §6

Shape tolerances of any line or surface are not considered suitable for a general tolerance requirement therefore must be specified one by one on drawings when necessary according to Std. 01376 (or specific standards). Position tolerances assigned considering theoretically exact dimensions (which are therefore boxed) must be specified on drawings according to Std. 01376. The rule that all tolerances (dimensional or geometric) are mutually independent applies. Consequently, geometric tolerances may still be used when the part is at the maximum dimensional tolerance limit (rectilinearity, planarity, orthogonality etc.) providing it is not a coupling because in the latter case the envelope condition must be respected and the maximum material principle always applies. It is important to note that the envelope condition requires that the surface of the part must be within the ideal surface determined by the maximum and minimum limit values. Furthermore, the maximum material principle binds the geometric tolerance value to the actual dimension of the part in a coupling (Std. 01377). Geometric tolerances apply regardless of real dimensions of the machined part. All tolerances must be respected independently. Geometric tolerances may be used also for parts with maximum material dimensions. The limiting envelope condition additionally applies to couplings. 4.1 Rectilinearity and planarity Rectilinearity and planarity tolerances are shown in Table 4. The nominal dimension to be considered for choosing the tolerance value is the length of the concerned line for rectilinearity tolerances or the length of the longer side of the surface or diameter of the circular surface for planarity tolerances.

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CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

4 GEOMETRIC TOLERANCES FOR FEATURES WITHOUT TOLERANCE INDICATION AND FOR LINEAR AND ANGULAR DIMENSIONS

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Sheet Fiat 1Group Automobiles

Table 4

Degree

of

Rectilinearity and planarity tolerance for nominal dimension range (mm) ≥6

≥30

≥120

≥400

≥1000

≥2000

≥4000

≤30

≤120

≤400

≤1000

≤2000

≤4000

≤8000

0.004

0.01

0.02

0.04

0.07

0.1

--

--

--

S*

0.008

0.02

0.04

0.08

0.15

0.2

0.3

0.4

--

T*

0.025

0.06

0.12

0.25

0.4

0.6

0.9

1.2

1.8

U

0.1

0.25

0.5

1

1.5

2.5

3.5

5

7

accuracy

To 6

R

Over 8000

* See § 5.

4.2 Circularity Circularity tolerance is equal to the numeric value of the diameter tolerance but must not exceed the radial run-out values indicated in Table 6. 4.3 Cylindricity Cylindricity tolerances are not established. Envelope conditions according to Fig.1 and 2 thus apply for cylindrical couplings . The surface of the machined part for shafts must not exceed (envelope conditions) the ideal geometric shape (cylinder) of the maximum dimension. Furthermore, the real dimension must not be smaller than the minimum dimension in any point.

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

NOTE: The maximum dimension of the shaft must be checked using a go-no-go ring gauge. Shaft

Cylinder

Tolerance

Shaft

Tolerance Dim. Min. Dim. Max.

1/2 tolerance

Dim.

Cylinder

1/2 tolerance

Min. Dim.

Figure 1

Max.

The surface of the machined part must not be smaller with minimum dimension than the ideal geometric shape of the minimum dimension (cylinder). Furthermore, the real dimension must not be larger than the maximum dimension in any point.

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NOTE: The minimum dimension of the hole must be checked using a go-no-go plug gauge.

Tolerance

Cylinder

Hole

Dim. Min. Dim. Max.

Tolerance

Cylinder

1/2 tolerance

Figure 2

Hole

1/2 tolerance

Dim. Min. Dim. Max.

4.4 Parallelism Parallelism tolerance is equal to the rectilinear and planarity tolerance values (see § 4.1) or to the tolerance of the distance between parallel lines or surfaces whichever is higher. The longest of the two parallel parts is taken as reference part. Either part may be taken as reference if they both have the same nominal dimension. The parallelism tolerance must be separately indicated according to Std. 01376 if these considerations on reference parts are not applicable.

In a particular coupling with parallel internal surfaces (similarly to the hole in Fig. 2) the minimum dimension of these surfaces must not be smaller than the ideal geometric shape in any point (envelope conditions). Furthermore, the real dimension must not be larger than the maximum dimension in any point. Parallel flat surfaces Parallel flat surfaces

Part

Part

Tolerance

Tolerance

Tolerance

Dim. Min. Dim.

Dim. Min. Dim.

Figure 3

Tolerance

Figure 4

Max.

Max.

4.5 Orthogonality and inclination Orthogonality and inclination tolerances are not established. General tolerances for angular dimensions may be adopted instead.

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The envelopment condition according to Fig. 3 and 4 applies for couplings with flat surfaces. In a particular coupling with parallel external surfaces (similarly to the shaft in Fig. 1) the maximum dimension of these surfaces must not be larger than the ideal geometric shape in any point (envelope conditions). Furthermore, the real dimension must not be smaller than the minimum dimension in any point.

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4.6 Symmetry Tolerances for symmetric (not revolution) parts are shown in Table 5. These revolutions apply also if only one of the symmetric parts is a revolution part and the other is not. For symmetry tolerances, the longer part is the reference part in all cases in which the parts may be placed into mutual relationship. Each part may be taken as reference if they both have the same nominal dimension. The symmetry tolerance must be separately indicated according to Std. 01376 if the considerations on reference parts are not applicable. Table 5 Degree of accuracy

Symmetric tolerance (mm)

R

0.3

S*

0.5

T*

1

U

2

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

4.7 Coaxiality Coaxiality tolerances are not established. The maximum coaxiality error may be equal to the radial run-out as shown in Table 6 (because the radial run-out is the result of coaxiality and circularity errors). 4.8 Radial run-out Radial run-out tolerances are shown in Table 6. The revolution axis is the reference part when realisable with adequate accuracy, otherwise the reference part is the longer part. Each part may be taken as reference if they both have the same nominal dimension. The run-out tolerance must be indicated according to Std. 01376 if these considerations on reference parts are not applicable. 4.9 Axial run-out Axial run-out tolerances are shown in Table 6. The revolution axis is the reference part when realisable with adequate accuracy, otherwise the reference part may be each symmetric revolution part. Table 6 Degree of accuracy

Radial and axial run-out tolerance (mm)

R

0.1

S*

0.2

T*

0.5

U

1

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5 INDICATION OF GEOMETRIC TOLERANCES ON DRAWINGS The following geometric tolerances are defined respectively by quoting this standard on drawings: - S degree for mechanical part drawings - T degree for body part drawings The following note must be written on drawings if a different degree of accuracy from that indicated above is required: Example: "Geometric tolerances for features without indications of tolerance - Std. 01444 - R degree of accuracy". The required degree of accuracy is indicated by a specific note if different degrees of accuracy are required for some geometric tolerances on any one part: Example: "Geometric tolerances for features without indications of tolerance - Std. 01444 - R degree of planarity".

7 CLASSIFICATION OF FEATURES The requirements contained in Spec. 9.01102 and Spec. 9.01102/10 apply for feature classification. Consequently, the concerned feature is classified in "Secondary B" class in all cases in which the allowed tolerance is inferred from this standard. A different "class of importance", if needed, must be indicated on drawings also if the allowed tolerance is equal to that specified in this standard.

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6 INDICATION OF DIMENSIONAL TOLERANCES ON DRAWINGS The following linear and angular dimensional tolerances are defined respectively by quoting this standard on drawings: - A degree - (Table 1): for centre-to-centre distances (where centre-to-centre distance is that between two axes and also the distance between an axis and an edge) - B degree - (Table 1): for linear, internal, external dimensions, thrusts, diameters and distances - B degree - (Table 2): for curvature radii and chamfer heights - B degree - (Table 3): for angular dimensions - C degree - (Table 1 and 3): for mechanical parts assembled by welding on linear and angular dimensions concerned by the welding. The geometric tolerances required in § 3 must always be specified with a specific note indicating the type of tolerance and degree of accuracy: Example: "Dimensional tolerances for dimensions without tolerance indication - Std. 01444, linear and angular dimensions, D degree". The required degree of accuracy is indicated in a specific note on drawings if different degrees of accuracy are required for the linear and angular dimension tolerances on any one part. Example: "Dimension tolerances without tolerance indication - Std. 01444: Centre-tocentre distance B degree - Linear dimensions C degree - Curvature radii C degree - Angular C degree".

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8 PARTS DESIGNED AND MADE OUTSIDE FIAT AUTO S.P.A. The dimensional and geometric features concerned by assembly with the other parts of the finished product must be dimensioned by FIAT Design on drawings if the parts are checked during reception mainly with reference to requirements in specifications. The requirements of these standards apply only to these features. These requirements must not be applied to all other features. 9 COMMON SUPPLY CATALOGUE PARTS Reference must be made to the tolerance values declared by the supplier for common supply parts or catalogue parts. 10 STANDARD TABLE Number of the standard 01455/05 01455/06 01455/07 01455/08

CONFIDENTIAL THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY FGA S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT PRESENT OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

01455/09 01455/10 01455/11 01455/12 01455/13 01455/14 01455/15

Topic of the standard Steel sand castings - Deviations for dimensions without indication of tolerance and machining allowance Spheroidal graphite cast iron sand castings - Deviations for dimensions without indication of tolerance Non-alloy grey sand castings - Deviations for dimensions without indication of tolerance Malleable cast iron sand castings - Deviations for dimensions without indication of tolerance Bronze or brass castings - Deviations for dimensions without indication of tolerance Die-cast aluminium alloy castings - Deviations for dimensions without indication of tolerance Aluminium alloy chill castings - Deviations for dimensions without indication of tolerance Aluminium alloy sand or mixed castings - Deviations for dimensions without indication of tolerance Synthetic resin parts - Deviations for dimensions without indication of tolerance Moulded rubber parts - Deviations for dimensions without indication of tolerance Sintered parts. Deviations for dimensions without indication of tolerance

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