BS 959:2008 2014

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Specification for internal micrometers (including stick micrometers)

Published By	Publication Date	Number of Pages
BSI	2014	20

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Categories: 17.040.30 - Measuring instruments, BSI

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Description

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

Table 2 Measuring heads — inch measurements

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

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;
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.

PDF Catalog

PDF Pages	PDF Title
4	Foreword
5	1 Scope Table 1 Measuring heads – metric measurements Table 2 Measuring heads – inch measurements
6	2 Normative references
7	Section 1: Internal micrometers 3 Material of measuring head 4 Measuring face of measuring head 5 Micrometer screw 6 Thimble and barrel
8	Figure 1 Measurement of distance from barrel to reading end of graduation
9	7 Extension rods 8 Spacing collars 9 Adjustment
10	10 Accuracy Table 3 Maximum permissible errors 11 Rigidity
11	Figure 2 Application of load in testing for rigidity 12 Handle 13 Marking 14 Case 15 Packing
12	Section 2: Stick micrometers Figure 3 Stick micrometer components 16 Terminal and abutment faces 17 Screwed joints
13	18 Extension rods 19 Accuracy of micrometer unit 20 Accuracy of extension rods Table 4 Tolerances for extension rods 21 Rigidity
14	22 Marking 23 Gap setting gauges Figure 4 Gap setting gauge 24 Case 25 Packing
15	Annex A (normative) Method of test for accuracy of internal micrometer readings
16	Table A.1 Measuring head readings
17	Bibliography

Additional information

Size 1	¼
Descriptors	Gauges, Rigidity, Linear measuring instruments, Dimensional tolerances, Micrometers, Internal, Graduations, Mechanical testing, Marking, Linear measurement, Precision, Accuracy
Standard Number	BS 959:2008
Size 3	1
ISBN	978 0 580 84673 1
Publication Date	2014-10-31
Size 2	½ or 1
Pages	20
Committee	TPR/1
Publisher	BSI
Replaces	BS 959:1950
Corrects	BS 959:2008
Title	Specification for internal micrometers (including stick micrometers)
Status	Confirmed
ICS Codes	17.040.30 - Measuring instruments

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BS 959:2008 2014

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