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AS 1275-1985
[Current]Metric screw threads for fasteners
Specifies requirements for single start parallel coarse pitch series metric screw threads, mainly intended for threaded fasteners. It covers screw threads from 1.6 mm diameter up to and including 64 mm diameter, in tolerance classes 6e, 6f, 6g and 8g, for external threads; and 6H and 6G for internal threads. Information is given on symbols for screw thread parameters, tolerances, deviations, thread classes, designation and verification. Appendices, giving notes on the production of screw threads and a comparison of symbols used in This Standard and the 1972 edition, are included. It should be particularly noted that in this edition, the thread roots of external threads (root curvature and associated limits and tolerances), are specified in a manner that is fundamentally different from the 1972 edition.
Published: 04/04/1985
Pages: 14
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 APPLICATION
1.3 REFERENCED DOCUMENTS
1.4 DEFINITIONS
1.5 SYMBOLS
1.6 VERIFICATION
1.7 STRESS AREA (As)
2 SCREW THREAD PROFILES
2.1 SCOPE OF SECTION
2.2 BASIC PROFILE
2.3 MAXIMUM MATERIAL PROFILE
2.3.1 Maximum material profile—internal thread
2.3.2 Maximum material profile—external thread
2.4 LEAST MATERIAL PROFILE
2.5 LIMITING PROFILES
2.5.1 Limiting profile—internal threads
2.5.2 Limiting profiles—external threads
2.6 ROOT CONTOURS
2.6.1 Internal threads
2.6.2 External threads
3 DIMENSIONS AND TOLERANCES
3.1 SCOPE OF SECTION
3.2 BASIC DIMENSIONS
3.3 TOLERANCE POSITIONS
3.4 FUNDAMENTAL DEVIATIONS
3.4.1 General
3.4.2 Internal threads
3.4.3 External threads
3.5 TOLERANCE GRADES
3.5.1 General
3.5.2 Root diameter tolerances
3.5.2.1 Internal threads
3.5.2.2 External threads
3.6 TOLERANCE CLASSES
3.6.1 General
3.6.2 Disposition of tolerance classes
3.6.3 Selection of tolerance classes
3.6.3.1 General
3.6.3.2 Length of axial thread engagement
3.6.3.3 Recommended combinations
3.7 LIMITS OF SIZE
3.8 COATED THREADS
4 DESIGNATION OF SCREW THREADS
4.1 SCOPE OF SECTION
4.2 COMPLETE DESIGNATION FOR INTERNAL THREADS
4.3 COMPLETE DESIGNATION FOR EXTERNAL THREADS
4.4 SHORTENED DESIGNATION FOR COARSE PITCH SERIES THREADS
4.5 DESIGNATION OF A THREAD FIT
APPENDIX A
APPENDIX B
Cited references in this standard
[Superseded]
Limits and fits for engineering- Imperial units (Supplement to AS1654-1974)
[Superseded]
Hot-dip galvanized coatings on threaded fasteners (ISO metric coarse thread series)
Content history
[Current]
[Superseded]
[Superseded]
DR 83215
AS 1275-1985 REC:2017
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