Co-operating organizations

The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations:

The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard:

This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 26 September 1968

The following BSI references relate to the work on this standard:

Committee reference MEE/117

Draft for comment 67/24646

Foreword

This standard makes reference to the following British Standards:

BS 427, Method for Vickers hardness test — Part 1: Testing of metals.

BS 860, Table for comparison of hardness scales.

BS 970, Wrought steels in the form of bars, billets, and forgings, up to 6 in ruling section, for automobile and general engineering purposes. En series.

BS 1133, Packaging code. Section 6. Temporary protection of metal surfaces against corrosion (during transport and storage).

BS 1134, Centre -line-average height method for the assessment of surface texture.

BS 1407, High carbon bright steel (silver steel).

BS 1423, High carbon oil-hardening steel (precision finish).

BS 1916, Limits and fits for engineering.

Obsolescent (by Amendment No. 1) The need for the pins covered by this British Standard has been reviewed and it has been decided that, in the interests of rationalization, they should be regarded as obsolescent. Their use for new designs is not therefore recommended. The standard will be withdrawn in due course.

NOTE Even though this standard has largely been superseded by BS EN 28734:1992 and BS EN 22338:1992, it has not been withdrawn but declared obsolescent as it is recognized that it should remain available for the servicing of existing designs which are expected to have a long working life.

This Part 2 or BS 1804 has been published under the authority of the Mechanical Engineering Industry Standards Committee, and forms a companion volume to Part 1, inch series.

An attempt has been made to set out a range of metric stock sizes that will satisfy European demands. These sizes are jointly based upon those given in the equivalent Austrian and ISO proposal documents. It is recognized that the cylindrical surface of precision ground parallel dowel pins sometimes has a functional duty necessitating numerical control of surface texture.

In order to avoid confusion about the meanings of the various terms used to describe “dowel pins”, the terms “precision ground parallel dowel pin”, “ground parallel dowel pin” and “parallel dowel pin” have been defined in this standard.

Dowel pins are normally used to locate two or more components to a required degree of accuracy. In order to provide for varying degrees of accuracy three grades have been standardized.

Attention is specially called to the danger which may arise when fitting dowel pins into blind holes. A suggestion for preventing this danger is made in an appendix.

A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover.

This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.

1 Scope

This British Standard specifies requirements for cylindrical parallel steel dowel pins used normally for the accurate location of components relative to each other.

Three grades are included:

2 Definitions

3 Material

3.1

3.2

4 Hardness

4.1 Grade 1 steel dowel pins.

4.2 Grades 2 and 3 steel dowel pins.

4.3 Alternative steels.

5 Dowel pins in blind holes

6 Dimensions

7 Limits of tolerance on dimensions

7.1 Diameter.

7.2 Length.

8 Surface texture

9 Dowel pin ends

10 Anti-corrosion treatment

11 Marking

12 Ordering

BS 1804-2:1968

Specification for parallel steel dowel pins - Metric series

Current

Published:

26 Sep 1968