Specification for engineers\' parallels. Imperial units

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

16-06-1972

Publisher

British Standards Institution

FOREWORD
SPECIFICATION
1. SCOPE
2. MATERIAL
3. STANDARD SIZES
4. FINISH
5. ACCURACY
6. PROTECTION
7. MARKING

Seven sizes of Grade A parallels with cross section ¼ in x ½ in to 1½ in x 3 in and nine of Grade B parallels with cross sections ¼ in x ½ in to 2 in x 4 in. Material, standard sizes, finish, accuracy, protection and marking.

This British Standard applies to parallel steel blocks of the following grades and sizes:

Grade A accuracy. Sizes ¼ in × ½ in × 4 in to 1½ in × 3 in × 12 in.

Grade B accuracy. Sizes ¼ in × ½ in × 4 in to 2 in × 4 in × 16 in.

The parallels of Grade A accuracy are high precision parallels primarily intended for inspection; those of Grade B accuracy are primarily intended for general tool room work.

NOTE 1. The larger sizes of parallels may be made with a series of lightening holes drilled through their thickness, provided that the accuracy of the parallels is not thereby affected.

NOTE 2. The titles of the British Standards referred to in this standard are listed on page 2.

Committee	TPR/1
DevelopmentNote	Supersedes BS 906(1940) (10/2005) Reviewed and confirmed by BSI, February 2012. (01/2012)
DocumentType	Standard
Pages	8
PublisherName	British Standards Institution
Status	Current

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BS 906-2:1972

Specification for engineers\' parallels. Imperial units

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Standards Referencing This Book

Category

Subcategory