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  • BSI
    BS 959:2008 Specification for internal micrometers (including stick micrometers)
    Edition: 2014
    $316.70
    / user per year

Description of BS 959:2008 2014

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 ¼ 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.



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.

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