BS 959:1950

Co-operating organizations
Foreword
Specification
Section one: Internal micrometers
1 Scope
2 Material of measuring head
3 Measuring face of measuring head
4 Micrometer screw
5 Thimble and barrel
6 Extension rods
7 Spacing collars
8 Adjustment
9 Accuracy
10 Rigidity
11 Handle
12 Case
13 Packing
14 Marking
Section two: Stick micrometers
15 Scope
16 Nomenclature
17 Terminal and abutment faces
18 Screwed joints
19 Extension rods
20 Accuracy of micrometer unit
21 Accuracy of extension rods
22 Rigidity
23 Marking
24 Gap setting gauges
25 Case
26 Packing
Appendices
A Method of testing internal micrometers
B Testing of internal micrometers

Micrometers comprising a measuring head, extension rods with or without spacing collars, handle (in smaller sizes). Three sizes of measuring head, in inch and metric units. Stick micrometers for measurement of greater internal lengths (6 in or 12 in micrometer unit, fitted with micrometer of 1 in range which, with series of extension rods, permits measurement up to maximum length required). Material, thimble and barrel, micrometer screw, extension rods, spacing collars, adjustment, accuracy, rigidity, handle, gap setting gauges, marking, case and packaging, test methods.