BS 906-2:1972

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Specification for engineers’ parallels. – Imperial units

Published By	Publication Date	Number of Pages
BSI	1972	8

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Categories: 17.040.30 - Measuring instruments, BSI

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Description

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.

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.

Additional information

Status	Confirmed
Pages	8
Publication Date	1972-06-16
ISBN	0 580 07043 3
Standard Number	BS 906-2:1972
Title	Specification for engineers' parallels. – Imperial units
Descriptors	Grades (quality), Imperial system, Accuracy, Dimensions, Engineers parallels, Hardness, Precision, Marking, Dimensional tolerances, Dimensional measurement, Steels
Publisher	BSI
Committee	TPR/1
ICS Codes	17.040.30 - Measuring instruments

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BS 906-2:1972

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