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ASME-B1.9 Buttress Inch Screw Threads , 1973
- CONTENTS
- Section [Go to Page]
- 1. Scope
- 2. Definitions
- 3. Form of Thread
- 4. Symbols and Formulas
- 5. Preferred Diameter-Pitch Combinations
- 6. Tolerances [Go to Page]
- 6.1 Pitch Diameter Tolerances
- 6.2 Tolerances on Major Diameter of External Thread and Minor Diameter of Internal Thread
- 6.3 Tolerances on Minor Diameter of External Thread and Major Diameter of Internal Thread
- 6.4 Lead and Flank Angle Deviations for Class 2
- 6.5 Diameter Equivalents for Variations in Lead and Flank Angles for Class 3
- 6.6 Tolerances on Taper and Roundness
- 7. Allowance for Easy Assembly
- 8. Example Showing Dimensions for a Typical Buttress Thread (2 Inch Diameter, 4 TPI, 7'/45' Flank Angles, Class 2)
- 9. Thread Designations [Go to Page]
- 9.1 Thread Designation Abbreviations
- 9.2 Designations for Standard Threads
- 9.3 Superseded Designations
- 10. Measurement of Buttress Thread Gages and Product [Go to Page]
- 10.1 Pitch Diameter Determination of Threaded Plug Gages
- 10.2 Pitch Diameter Determination of Threaded Ring Gages
- 10.3 Pitch Diameter Determination of External Product Threads
- 10.4 Pitch Diameter Determination of Internal Product Threads
- 10.5 Lead and Flank Angle Measurement
- 11. Recommended Gaging Practice [Go to Page]
- 11.1 Recommended Gages and Gaging Practice for External Thread
- 11.2 Recommended Gages and Gaging Practice for Internal Thread
- 11.3 Root Relief Width for Gages
- 11.4 Gage Tolerances
- 12. Dimensional Acceptability of Buttress Product Screw Threads [Go to Page]
- 12.1 Dimensional Acceptability of Class 2 Buttress Product Threads
- 12.2 Dimensional Acceptability of Class 3 Buttress Product Threads
- Appendix A - Pitch Diameter Equivalents for Lead and Flank Angle Deviations [Go to Page]
- A.1 Lead Deviations
- A.2 Flank Angle Deviations
- A.3 Computed Functional Size
- Appendix B - Pitch Diameter Measurement [Go to Page]
- B.1 Measurement of Pitch Diameter of External Buttress Threads
- B.2 Measurement of Pitch Diameter and Groove Diameter of Internal Buttress Threads
- B.3 Lead-Angle Correction
- B.4 Wire SIzes
- Appendix C - Notes on Corresponding British Standards
- Appendix D - Buttress Screw Thread Designations used in old ASA B1.9-1953 Standard
- TABLES [Go to Page]
- Table 1 Diameter-Pitch Combinations for 7"/45" Buttress Threads
- Table 2 Basic Dimensions for 7'/45' Buttress Threads of Preferred Pitches
- Table 3 Tolerances, Class 2 (Standard Grade)
- Table 4 Tolerances, Class 3 (Precision Grade)
- Table 5 Allowances, Classes 2 and 3
- Table 6 X Gagemaker's Tolerances for GO and NOT GO Buttress Threaded Plug, Ring, Snap and Indicating Gages
- Table 7 W Gagemaker's Tolerances for GO and NOT GO Buttress Threaded Setting Plug Gager
- Table 8 Gagemaker's Tolerances for Plain Plug, Ring and Snap Gages
- Table 9 Pitch Diameter Equivalents for Lead Deviations
- Table 10 Pitch Diameter Equivalents for Flank Angle Deviations
- Table 11 Thread-Measuring Wires for 7'/45' Buttress Threads
- Table 12 Numerical Data for British Standard Form Buttress Screw Threads
- FIGURES [Go to Page]
- Fig. 1a Form of Standard 7'/45' Buttress Thread with 0.6p Basic Height of THread Engagement and Round Root
- Fig. 1b Form of 7'/45' Buttress Thread with 0.6p Basic Height of Thread Engagement and Flat Root
- Fig. 2 Disposition of Buttress Thread Tolerances, Allowances, and Root Trunctions
- Fig. 3 Measuring Steps for Internal Pitch Diamater
- Fig. 4 Diameters of "Best" and "Maximum" Thread Wires for Buttress Screw Threads
- Fig. 5 British Standard Form of Buttress Thread Assuming no Allowance [Go to Page]
