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BSI BS 959:2008

Specification for internal micrometers (including stick micrometers)
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BSI BS 959:2008

Specification for internal micrometers (including stick micrometers)

PUBLISH DATE 2014
PAGES 20
BSI BS 959:2008

This standard specifies requirements for internal micrometers comprising a measuring head, extension rods with or without spacing collars, and, in the smaller sizes, a handle.

Provision is made for three sizes of measuring heads, in both metric and inch units, as shown in Table 1 and Table 2.

NOTE Attention is drawn to the fact that metric dimensions are not necessarily direct conversions of the imperial dimensions.

Table 1 Measuring heads — metric measurements

Size of head

Length of graduated scale on barrel

Usual ranges of the instrument when used with extension rods

mm

mm

Size 1 5 or 6.5 25-50
Size 2 10 or 13 50-150
50-200
50-300
Size 3 25 200+

Table 2 Measuring heads — inch measurements

Size of head

Length of graduated scale on barrel

Usual ranges of the instrument when used with extension rods

in

in

Size 1 ÂĽ 1-2
Size 2 ½ or 1 2-6
2-8
2-12
Size 3 1 8+

This standard also covers stick micrometers, which are designed for the measurement of longer internal lengths, and comprise the following parts:

  1. a 150 mm or 300 mm or 6 in or 12 in micrometer unit, fitted with a micrometer of 25 mm or 1 in range, and having rounded terminal faces;

  2. a series of extension rods which, together with the micrometer unit, permit a continuous range of measurement up to the maximum length required.

Annex A gives a method of test for the accuracy of internal micrometer readings.

SDO BSI: British Standards Institution
Document Number 959
Publication Date Oct. 31, 2014
Language en - English
Page Count
Revision Level
Supercedes
Committee TPR/1
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