ASME_B1.1-2003统一英制螺纹
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ASMEB1.1-2003统-英制螺纹Foreword ........................................................................ vi
Committee Roster................................................................ viii
1 General ..................................................................... 1
1.1 Scope.................................................................. 1
1.2 Unified Screw Thread Standards........................................ 1
1.3 UN and UNR Screw Threads........................................... 1
1.4 Interchangeability...................................................... 1
1.5 Designations........................................................... 1
1.6 Reference Documents................................................... 1
1.7 Acceptability........................................................... 2
1.8 Reference Temperature.................................................. 2
1.9 Units of Measure....................................................... 2
1.10 Federal Government Use................................................ 2
2 Screw Thread Profile......................................................... 2
2.1 Scope.................................................................. 2
2.2 Basic Profile............................................................ 2
2.3 Design Profiles......................................................... 2
2.4 Formulas and Symbols................................................. 2
3 Screw Thread Series ......................................................... 2
3.1 Thread Series Definition................................................ 2
3.2 Order of Selection...................................................... 2
3.3 Coarse-Thread Series Applications...................................... 3
3.4 Fine-Thread Series Applications......................................... 3
3.5 Extra-Fine-Thread Series Applications................................... 3
3.6 Constant-Pitch Thread Series Applications............................... 3
3.7 Fine Threads for Thin-Wall Tubing...................................... 7
4 Screw Thread Classes........................................................ 36
4.1 Thread Classes......................................................... 36
4.2 Combinations of Classes................................................ 36
5 Screw Thread Allowance and Tolerance........................................ 36
5.1 Allowance.............................................................. 36
5.2 Pitch Diameter Tolerance, All Classes................................... 36
5.3 Special Lengths of Engagement,LE..................................... 37
5.4 Minor Diameter Tolerance and Allowance for External Threads.......... 54
5.5 Major Diameter Tolerance for Internal Threads.......................... 54
5.6 Minor Diameter Tolerance and Length of Engagement for Internal
Threads.............................................................. 55
5.7 Disposition of Allowance and Tolerance................................. 55
5.8 Formulas for Allowance and Tolerance.................................. 55
5.9 Lead and Flank Angle Tolerances....................................... 58
5.10 Coated or Plated Threads............................................... 58
5.11 Circular Runout........................................................ 58
6 Screw Thread Designation.................................................... 58
6.1 Basic Method of Designating............................................ 58
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