ISO 2903:2016
ISO metric trapezoidal screw threads — Tolerances
ISO 2903:2016 specifies a tolerance system for metric trapezoidal screw threads in accordance with ISO 2902. The tolerances refer to the design profile in accordance with ISO 2901.
The tolerance system does not apply to trapezoidal screw threads with special requirements on axial displacement, for example, machine tool lead and feed screws and nuts.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Tolerance system
6 Tolerance positions
7 Tolerance grades
8 Length groups of thread engagement
9 Recommended tolerance classes
10 Multiple-start threads
11 Formulae
11.1 General
11.2 Fundamental deviations
11.3 Crest diameter tolerances
11.3.1 Tolerances for major diameter of external thread (Td)
11.3.2 Tolerances for minor diameter of internal thread (TD1)
11.4 Pitch diameter tolerances
11.4.1 Tolerances for pitch diameter of external thread (Td2)
11.4.2 Tolerances for pitch diameter of internal thread (TD2)
11.5 Tolerances for minor diameter of external thread (Td3)
11.6 Length groups of thread engagement
12 Designation
12.1 General
12.2 Designation of single-start threads
12.3 Designation of multiple-start screw threads
12.4 Designation of left-hand threads
Bibliography
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Related Information
Similar Standards
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BS 1936-2:1991
Undercuts and runouts for screw threads, Specification for ISO metric screw threads
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BS 3643-1:2007
ISO metric screw threads, Principles and basic data
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BS 3643-2:2007
ISO metric screw threads, Specification for selected limits of size
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BS 4185-10:1977
Machine tool components, Trapezoidal threads for lead and feed screw assemblies
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Tolerance system
6 Tolerance positions
7 Tolerance grades
8 Length groups of thread engagement
9 Recommended tolerance classes
10 Multiple-start threads
11 Formulae
11.1 General
11.2 Fundamental deviations
11.3 Crest diameter tolerances
11.3.1 Tolerances for major diameter of external thread (Td)
11.3.2 Tolerances for minor diameter of internal thread (TD1)
11.4 Pitch diameter tolerances
11.4.1 Tolerances for pitch diameter of external thread (Td2)
11.4.2 Tolerances for pitch diameter of internal thread (TD2)
11.5 Tolerances for minor diameter of external thread (Td3)
11.6 Length groups of thread engagement
12 Designation
12.1 General
12.2 Designation of single-start threads
12.3 Designation of multiple-start screw threads
12.4 Designation of left-hand threads
Bibliography