Standard
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AS 3501-1987
[Current]Parallel screw threads of whitworth form (BSW and BSF) and associated gauges and gauging practice
Specifies thread profile and provides information on designation, thread classes, deviations and gauging. Limits of size for both coarse pitch series (BSW) and fine pitch series (BSF), together with associated tolerances, are given. It also covers screw gauges and associated setting plugs, and plain plug and calliper gauges, and includes information on types of gauges, gauge deviations and tolerances, materials and hardness, general gauge design requirements, marking, and general notes on the inspection of screw threads. Appendices give information on special threads, pitch diameter of pitch and flank angle errors, and notes on screw thread verification.
Published: 05/10/1987
Pages: 39
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 THE BRITISH STANDARD WHITWORTH SCREW THREAD SYSTEM
1.4 REFERENCED DOCUMENTS
1.5 DESIGNATION
1.5.1 General
1.5.2 Threads with special requirements
1.5.2.1 Coated threads
1.5.2.2 Threads of truncated form
1.5.2.3 Multistart threads
2 SCREW THREAD PROFILES
2.1 SCOPE OF SECTION
2.2 BASIC (AND DESIGN) PROFILE AND THREAD DATA
2.3 LIMITING PROFILES
3 GENERAL PLAN
3.1 SCOPE OF SECTION
3.2 THREAD SERIES
3.2.1 General
3.2.2 Coarse pitch series (BSW)
3.2.3 Fine pitch series (BSF)
3.2.4 Constant pitch series (supplementary selected series) (Whit. S)
3.2.4.1 General
3.2.4.2 Selection of Whit. S threads
3.3 BASIC DIMENSIONS
3.3.1 British Standard Whitworth Coarse (BSW) and British Standard Whitworth Fine (BSF) thread series
3.3.2 Supplementary selected series(Whit. S)
4 THREAD CLASSES, DEVIATIONS, AND TOLERANCES
4.1 SCOPE OF SECTION
4.2 THREAD CLASSES
4.2.1 General
4.2.2 Recommended combinations
4.3 FUNDAMENTAL DEVIATIONS
4.4 TOLERANCES
4.4.1 Coarse pitch series (BSW) and fine pitch series (BSF)
4.4.1.1 General
4.4.1.2 Pitch diameter tolerances
4.4.1.3 Crest diameter tolerances
4.4.1.4 Root diameter tolerances
4.4.1.5 Length of axial thread engagement
4.4.2 Constant pitch (Whit. S) series
4.5 COATED THREADS
4.5.1 General
4.5.2 External threads up to and including ¾ in diameter
4.5.2.1 Close class
4.5.2.2 Medium arid free classes
4.5.3 External threads over ¾ in diameter
4.5.3.1 Close class
4.5.3.2 Medium and free classes
4.5.4 Internal threads
4.6 STAINLESSSTEEL EXTERNAL THREADS
5 LIMITS OF SIZE
5.1 SCOPE OF SECTION
5.2 LIMITS OF SIZE
6 GAUGING OF SCREW THREADS OF WHITWORTH FORM
6.1 SCOPE OF SECTION
6.2 TYPES OF GAUGES
6.2.1 General
6.2.2 Gauges for external threads and associated setting plugs
6.2.3 Gauges for internal threads
6.3 MATERIALS AND HARDNESS
6.3.1 Material
6.3.2 Hardness
6.4 REFERENCE TEMPERATURE
6.5 MARKING
6.6 INSPECTION OF SCREW THREADS
6.6.1 General
6.6.2 Gauging of screw threads
6.6.2.1 Gauging of external threads
6.6.2.2 Gauging of internal threads
6.6.2.3 Application of gauges to external threads
6.6.2.4 Application of gauges to internal threads
6.6.2.5 Gauge wear
6.6.3 Inspection by measurement
6.6.4 Disputes
6.7 DESIGN FEATURES OF SCREW GAUGES
6.7.1 General
6.7.2 Breaking of sharp edges
6.7.2.1 General
6.7.2.2 Feather edges
6.7.3 Dirt grooves
6.7.4 Thread profiles
6.7.4.1 GO screw gauges
6.7.4.2 NOT GO gauges
6.7.4.3 Setting gauges
6.7.5 Deviations and tolerances for gauging elements
6.7.5.1 General
6.7.5.2 Gauges for external threads
6.7.5.3 Gauges for internal threads
6.7.5.4 Setting plugs
6.7.5.5 Plain NOT GO gauges for the crest diameters
6.7.5.6 Values for use in calculating thread profiles
APPENDIX A
A1 SCOPE
A2 THREAD FORM
A3 BASIC TRUNCATION AND ASSOCIATED TOLERANCES (see Figure A1)
A3.1 Basic truncation of the crest diameters
A3.1.1 External threads
A3.1.2 Internal threads
A3.2 Tolerances for the crest diameters (see Figure A1)
A3.2.1 External threads
A3.2.2 Internal threads
A4 FUNDAMENTAL DEVIATIONS AND TOLERANCES FOR THE ROOT AND PITCH DIAMETERS
A4.1 External threads
A4.2 Internal threads
A5 LIMITS OF SIZE FOR THE TRUNCATED CREST DIAMETERS
A6 DESIGNATION
A7 GAUGING SYSTEM FOR TRUNCATED WHITWORTH THREADS
APPENDIX B
B1 SCOPE
B2 FUNDAMENTAL DEVIATIONS
B3 TOLERANCES
B3.1 External threads
B3.1.1 Pitch diameter
B3.1.2 Major diameter
B3.1.3 Minor diameter
B3.2 Internal threads
B3.2.1 Pitch diameter
B3.2.2 Major diameter
B3.2.3 Minor diameter
B4 LENGTH OF AXIAL THREAD ENGAGEMENT
B5 DEPTH OF RADIAL THREAD ENGAGEMENT
APPENDIX C
APPENDIX D
D1 SCOPE
D2 DEFINITIONS
D3 EFFECT OF PITCH AND FLANK ANGLE ERRORS
D3.1 General
D3.2 Effect of errors in pitch
D3.3 Effect of errors in flank angles
D4 COMBINATION OF PITCH AND FLANK ANGLE ERRORS
APPENDIX E
Cited references in this standard
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