Preferred Metric Sizes for Flat, Round, Square, Rectangular, and Hexagonal Metal Products

AN A MERICAN NA TIONAL S T AND ARD

ASME B32.100-2016

[Revision of ASME B32.100-2005 (R2011)]

ASME B32.100-2016

[Revision of ASME B32.100-2005 (R2011)]

Preferred Metric

Sizes for Flat, Round, Square, Rectangular, and Hexagonal Metal Products

AN AMERICAN NATIONAL STANDARD

Date of Issuance: October 14, 2016

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CONTENTS

Foreword iv

Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Committee Roster vi

Correspondence With the B32 Committee vii

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Use of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

4 Basis of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

5 Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Nonmandatory Appendix

FOREWORD

The U.S. Department of Commerce, in its July 1971 report to Congress, titled “A Metric America — A Decision Whose Time Has Come,” recommended that the United States should change to the metric system of measurement through a coordinated national program. This action, along with subsequent increased metric activity in industry, resulted in a number of requests from producers and users that the B32 Committee develop preferred series of metric sizes for the various forms of wrought metal mill products.

The B32.100 standard is based on the previously published standards B32.3M-1984 and B32.4M-1980. Development of these standards was started in 1973. The proposal received Standards Committee B32 approval on June 4, 1974. It was subsequently approved by the sponsor and submitted to the American National Standards Institute (ANSI) for designa- tion as an American National Standard. This was granted on July 9, 1974. The last edition was approved by ANSI on September 24, 1984 and reaffirmed in 1994.

The sizes in this Standard are derived from a list of preferred metric sizes in which each number is approximately 60% greater than the number preceding it (ANSI B4.2 or ISO 497 Series R5'). Second Choice sizes are in increments of 25% (Series R10') and Third Choice sizes in increments of 12% (Series R20'). Some deviations from this principle occur as the result of minor rounding. The selected sizes also reflect standard material sizes in ISO and national standards in tradi- tional metric countries.

In 2002, the B32 Committee established a task force to draft a new metric standard for the product group: ASME B32.100-200X Preferred Metric Sizes for Flat, Round, Square, Rectangular, and Hexagonal Metal Products.

Material tolerances must be included in order to fully define the size of a product. International or leading national metric standards data were used as the basis for the tolerance data included in this Standard. References to the sources of these tolerances have been made, and a list of related standards are shown in Nonmandatory Appendix A.

The 2005 edition was approved by ANSI on February 11, 2005.

The present edition deleted obsolete references, the year date of the referenced standards have been deleted, and some corrections were made to Nonmandatory Appendix A. The present edition also includes additional data and clarification related to para. 5.8 and Table 13.

The present edition was approved by ANSI on June 29, 2016.

ACKNOWLEDGEMENT

Data shown in this Standard were developed with the help of the global standards material published in the book, Metric Standards for Worldwide Manufacturing, with the permission of the publishers, ASME Press and GOmetricUSA.org.

ASME B32 COMMITTEE

Metal and Metal Alloy Wrought Mill Product Nominal Sizes

(The following is the roster of the Committee at the time of approval of this Standard.)

STANDARDS COMMITTEE OFFICERS

J. A. Gruber, Chair

A. R. Amaral, Secretary

STANDARDS COMMITTEE PERSONNEL

A. R. Amaral, The American Society of Mechanical Engineers

D. O. Bankston, Jr., Bechtel National, Inc.

D. Frikken, Becht Engineering Co.

J. A. Gruber, J A Gruber & Associates, LLC

R. A. McLeod, General Electric Co.

A. P. Rangus, Bechtel

R. Reamey, Turner Industries Group, LLC

F. W. Tatar, FM Global

M. L. Nayyar, Alternate, NICE

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ASME B32.100-2016

PREFERRED METRIC SIZES FOR FLAT, ROUND, SQUARE, RECTANGULAR, AND HEXAGONAL METAL PRODUCTS

1. SCOPE

   This Standard establishes a preferred series of metric thicknesses, widths, and lengths for flat metal products of rectangular cross section. The thicknesses and widths shown in this Standard are also applicable to base metals that may be coated in later operations. This Standard also establishes a preferred series of metric sizes for round, square, rectangular, and hexagonal metal products.

   
   

2. GENERAL

The sizes in this Standard provide an orderly series of thicknesses for all flat metal products and widths for rectangular cross-section metal products. The series was developed to provide a reasonable selection of metal thicknesses from 0.050 mm to 300 mm and of metal widths from 10 mm to 5 000 mm. In each case, the series provides for some second, third, and sometimes fourth choice sizes (thicknesses and widths) to cover instances where selection from the primary preferred sizes may be inadequate. Sufficient coverage in logical steps is presented in the tables to adequately serve most of the general purpose requirements of industry for flat metal products. This Standard provides an orderly series of lengths for flat metal products.

This Standard also provides a series of sizes for each of round, square, rectangular, and hexagonal forms of metal products used for general applications. The series was developed to provide a reasonable selection of metal diameters from 0.020 mm to 320 mm for rounds and distance-across-flats from 3 mm to 300 mm for squares, various cross-section sizes from 1.6 mm by

2 mm to 100 mm by 200 mm for rectangles, and from

1.5 mm to 150 mm for hexagons. The series provides for some second, third, and fourth choice diameters for rounds and second and third choice distance-across- flats for squares and hexagons, where selection from the primary preferred sizes may be inadequate. The series also provides for preferred lengths of rounds, squares, rectangles, and hexagons. Sufficient coverage in logical steps is presented in the tables to adequately serve most of the general purpose requirements of industry for round, square, rectangular, and hexagonal metal products.

It is recognized that for some applications, particularly large-volume requirements in some metals for specific end uses, precise engineering requirements dictate a need for sizes other than those presented in this

Standard. This Standard is in no way meant to preclude the use of such sizes where they are required. However, for general purpose applications or where requirements permit some latitude in the selection of thickness or thick- ness/width/length combinations, the simplified preferred sizes given in this Standard should facilitate interchangeability of metals in design, reduce inventories, and increase the availability of warehouse stocks of those sizes commonly used for general purpose applications. In such instances, the use of sizes listed in this Standard is to be encouraged.

All of the sizes included in this Standard are not neces- sarily produced in all metals and grades. Producers or distributors should be consulted to determine availability of a particular thickness or thickness/width combination for a given metal product.

1. USE OF TABLES

   Wherever possible, sizes should be selected from the columns headed “First Choice.” Only if no size in the preferred list is suitable should a selection be made from the columns headed “Second Choice” or “Third Choice.” Lengths should be selected from the preferred list.

   
   

2. BASIS OF TABLES

   The sizes in this Standard are derived from a list of preferred metric sizes in which each number is approxi- mately 60% greater than the number preceding it [ANSI B4.2 (Preferred Metric Limits and Fits) or ISO 497 (Guide to the choice of series of preferred numbers and series containing more rounded values of preferred numbers) Series R5']. Second Choice sizes are in increments of 25% (Series R10') and Third Choice sizes in increments of 12% (Series R20'). Some deviations from this principle occur as the result of minor rounding. The selected sizes also reflect standard material sizes in ISO and national standards in traditional metric countries.

   
   

3. TOLERANCES

Material product tolerances are shown in applicable international or national product standards. Normal toler- ances shown in international standards are generally larger and could be up to twice as large for metric material compared with customary inch tolerances used in the U.S. Only a few major product groups will be covered by this Standard, and they are specified in paras. 5.1 through 5.8.