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UDC 621.921 I922
IS0
I NTER N AT I O NA L O RG A N IZAT I O N FOR
STA N DARD IZ AT1 O N
IS0 RECOMMENDATION
R 525
BONDED ABRASIVE PRODUCTS - GENERAL FEATURES
DIMENSIONS - PROFILES
DESIGNATION - RANGES OF
1st EDITION
November 1966
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 525, Bonded Abrasive Products - General Features -
Designation - Ranges of dimensions - Projiles, was drawn up by Technical Committee
ISO/TC 29, Smalï Tools, the Secretariat of which is held by the Association Française de
Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1950 and led, in 1963,
to the adoption of a Draft IS0 Recommendation.
In September 1964, this Draft IS0 Recommendation (No. 735) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an
editorial nature, by the following Member Bodies :
Argentina India Spain
Australia Iran Sweden
Austria Israel
Switzerland
Canada Italy Turkey
Chile Japan U.A.R.
Czechoslovakia Korea, Rep. of United Kingdom
France Netherlands
U.S.A.
Germany New Zealand Yugoslavia
Greece Poland
Two Member Bodies opposed the approval of the Draft:
Belgium
U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the
IS0 Council, which decided, in November 1966, to accept it as an IS0 RECOMMEN-
DATION.
CONTENTS
Page
Foreword .
.......................... 3
1. Scope . . 3
2. Commentary . .
.......................... 3
3. Designation of bonded abrasive products . 4
4. Ranges of nominal dimensions . 7
5. Special profiles for plain non-cylindrical wheels . 8
AnnexA . 8
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E
IS0 / R 525 - 1966 (E)
IS0 Recommendation
R 525
November 1966
BONDED ABRASIVE PRODUCTS - GENERAL FEATURES
DESIGNATION - RANGES OF DIMENSIONS - PROFILES
FOREWORD
The letter symbols used for dimensions in this IS0 Recommendation may be replaced in national
standards by those in conformity with the current practice of the country in question, until an
international agreement regarding a uniform symbol system is reached.
1. SCOPE
This IS0 Recommendation relates to bonded abrasive products in general, excluding diamond
abrasive products. It comprises
- the designation of bonded abrasive products (shapes, sizes, specifications),
- the ranges of nominal dimensions (outside diameters, thicknesses, holes),
- the symbols for the profiles of plain non-cylindrical grinding wheels.
Tolerances on dimensions will be covered by a separate IS0 Recommendation to be issued later.
The dimensions standardized for each class of product are, or will be, the subject of individual
IS0 Recommendations, the first of which is IS0 Recommendation R. . . ,* Bonded Abrasive
I).
Products. Grinding Wheel Dimensions(Part
2. COMMENTARY
Designation and specification
The usefulness of a uniform system of designation and marking for grinding wheels and bonded
abrasive products has been recognized by manufacturers and users.
The main obstacle to a uniform marking system, however, as far as specifications are concerned,
lies in the fact that similarly marked grinding wheels produced by different manufacturers do not
necessarily give the same results in use.
With regard to these specifications, therefore, it is important to emphasize that the present stan-
dardization applies solely to the marking and not to the performance of the grinding wheel in
operation; grinding wheels with the same standard symbols, but from different sources, may
therefore behave differently from one another when in use.
The symbols adopted constitute a codification of the practices most generally in force. Particular
attention is drawn to the fact that the symbols for the size of grain are only simple conventional
numbers which are valid pending some future logical standardization of the sizes of granular or
powdered materials in general.
Dimensional ranges
The nominal dimensions in this IS0 Recommendation have been selected to provide convenient
ranges satisfying all requirements as far as possible.
Outside diameters and thicknesses are given in two columns, one in millimetres and the other in
inches, which show opposite each other the values considered to be practically equivalent in the
two systems of units.
* At present Draft IS0 Recommendation No. 736.
-3-
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IS0 / R 525 - 1966 (E)
The values standardized for the holes are identical, whether expressed in inches or in millimetres.
In the recommended series, the inch values are conversions from the round metric values up
to 40 mm, and the metric values are conversions from the round inch values above that dia-
meter.
A supplementary table gives the values below 2 in (50.8 mm), the use of which is also recognized
for a transitional period.
3. DESIGNATION OF BONDED ABRASIVE PRODUCTS
The complete designation of a bonded abrasive product consists of indications of the shape,
dimensions and specifications of the internal nature of the product, in that order.
Example : Shape Dimensions Specification
300 x 40 x 32 51A - 36 - L- 5 -V23
Type 1
(12 x 1% x 1.26)
3.1 Shapes and dimensions
3.1.1 Plain wheels - Dish wheels - Depressed-centre wheels
Write the following in the order shown:
- the type, this marking remaining optional, however, for Type 1 :
for plain wheels, without recess,
Type 1
Type 5 or 7 for plain wheels with one or two recesses respectively,
Type 12 for dish wheels,
Type 27 for depressed-centre wheels.
- the three dimensions, in the following order, separated by the multiplication sign:
outside diameter D. thickness E and hole d.
In addition, state the following where necessary:
- below the type number, the letter
...