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eLibrary > ASME B1.1-2024 Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms) >

ASME B1.1-2024 Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms), 2024

CONTENTS
FOREWORD
ASME B1 COMMITTEE ROSTER
CORRESPONDENCE WITH THE B1 COMMITTEE
1 GENERAL [Go to Page]
1.1 Scope
1.2 Unified Screw Thread Standards
1.3 Thread Forms
1.4 Interchangeability
1.5 Designations
1.6 References
1.7 Acceptability
1.8 Reference Temperature
1.9 Units of Measure
1.10 Federal Government Use
2 SCREW THREAD PROFILE [Go to Page]
2.1 Scope
2.2 Basic Profile
2.3 Design Profiles
2.4 Formulas and Nomenclature
3 SCREW THREAD SERIES [Go to Page]
3.1 Thread Series Definition
3.2 Order of Selection
3.3 Coarse-Thread Series Applications
3.4 Fine-Thread Series Applications
3.5 Extra-Fine-Thread Series Applications
3.6 Constant-Pitch-Thread Series Applications
3.7 Fine Threads for Thin-Wall Tubing
4 SCREW THREAD CLASSES [Go to Page]
4.1 Thread Classes
5 SCREW THREAD ALLOWANCE AND TOLERANCE [Go to Page]
5.1 Allowance
5.2 Pitch Diameter Tolerance, All Classes
5.3 Special Lengths of Engagement, LE
5.4 Minor Diameter Tolerance and Allowance for External Threads
5.5 Major Diameter Tolerance for Internal Threads
5.6 Minor Diameter Tolerance and Length of Engagement for Internal Threads
5.7 Disposition of Allowance and Tolerance
5.8 Formulas for Allowance and Tolerance
5.9 Lead and Flank Angle Tolerances
5.10 Coated or Plated Threads
5.11 Circular Runout
6 SCREW THREAD DESIGNATION [Go to Page]
6.1 Basic Method of Designating
6.2 Method of Designating Coated Threads
6.3 Method of Designating Left-Hand Threads
6.4 Method of Designating Special Unified Threads
6.5 Designations for Other Threads
6.6 Method of Designating Threads Having Special Length of Engagement
6.7 Method of Designating Threads Having Modified Crests
7 DIMENSIONAL ACCOMMODATION OF COATING OR PLATING FOR 60-DEG THREADS [Go to Page]
7.1 Introduction
7.2 Strength
7.3 Electrodeposited Coatings
7.4 Other Considerations
7.5 Material Limits for Coated Threads
7.6 Dimensional Effects of Coating
7.7 External Thread With Allowance Available for Coating
7.8 External Thread With No Allowance for Coating
7.9 Internal Threads
8 LIMITS OF SIZE FOR STANDARD (UN, UNR, AND UNJ) AND SPECIAL (UNS, UNRS, AND UNJS) SERIES OF THREADS [Go to Page]
8.1 Standard Series
8.2 Limits of Size
8.3 Formulas for Limits of Size
8.4 Example of Calculations From Formulas
9 THREAD FORM TOLERANCES [Go to Page]
9.1 Form Variation
9.2 Lead and Flank Angle Acceptance
10 FORMULAS AND NOMENCLATURE FOR THREAD FORM
11 TABLES OF BASIC DIMENSIONS [Go to Page]
11.1 Table Content
11.2 Thread Series
Figures [Go to Page]
Figure 1 Illustration of Assembly Interference of UNJ-3A Thread and UN-3B Thread in the Maximum Material Condition
Figure 2 Basic Profile for UN and UNR Screw Threads
Figure 3 Basic Profile for UNJ Screw Threads
Figure 4 Root Radius of UNJ External Thread
Figure 5 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Series UN, Classes 1A, 2A, 1B, and 2B
Figure 6 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UN, Classes 3A and 3B
Figure 7 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Series UNR, Classes 1A and 2A, and Series UN, Classes 1B and 2B
Figure 8 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UNR, Class 3A and Series UN, Class 3B
Figure 9 External UNJ Thread Design Profile and Tolerances
Figure 10 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Series UNJ, Classes 2A and 2B
Figure 11 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UNJ, Classes 3A and 3B
Figure 12 Internal UNJ Thread Design Profile and Tolerances
Figure 13 Basic Method of Designating Screw Threads
Figure 14 Ratio of Pitch Diameter Change to Thickness of Coating on 60-deg Threads
Figure 15 Effect of Electrodeposited Coating on 60-deg External Threads
Figure 16 Application of General Thread Symbols
Figure A-1 Identification of 60-deg Inch Screw Threads Within the Scope of the ASME B1 Committee
Tables [Go to Page]
Table 1 Standard Series Threads (UN, UNR, and UNJ)
Table 2A Limits of Size for Standard Series External Threads (UN, UNR, and UNJ)
Table 2B Limits of Size for Standard Series Internal Threads (UN and UNJ)
Table 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter
Table 4 Increments in Pitch Diameter Tolerance — Class 2A (PD Tolerance = 0.0015 3√D + 0.0015√LE + 0.015 3√p2)
Table 5 Basic Profile and Constants for Calculation Formulas of Thread Dimensions, in.
Table 6 Basic Dimensions for Coarse-Thread Series (UNC, UNRC, and UNJC)
Table 7 Basic Dimensions for Fine-Thread Series (UNF, UNRF, and UNJF)
Table 8 Basic Dimensions for Extra-Fine-Thread Series (UNEF, UNREF, and UNJEF)
Table 9 Basic Dimensions for 4-Thread Series (UN, UNR, and UNJ)
Table 10 Basic Dimensions for 6-Thread Series (UN, UNR, and UNJ)
Table 11 Basic Dimensions for 8-Thread Series (UN, UNR, and UNJ)
Table 12 Basic Dimensions for 12-Thread Series (UN, UNR, and UNJ)
Table 13 Basic Dimensions for 16-Thread Series (UN, UNR, and UNJ)
Table 14 Basic Dimensions for 20-Thread Series (UN, UNR, and UNJ)
Table 15 Basic Dimensions for 28-Thread Series (UN, UNR, and UNJ)
Table 16 Basic Dimensions for 32-Thread Series (UN, UNR, and UNJ)
Table 17A Outline Guide for Determining Limits of Size of External Threads
Table 17B Outline Guide for Determining Limits of Size of Internal Threads
Table 18A Examples of External 2A Screw Threads
Table 18B Example of External 3A Screw Threads
Table 18C Examples of Internal 2B Screw Threads
Table 18D Example of Internal 3B Screw Threads
Table 19 Allowable Variation in 30-deg Basic Half Angle of External and Internal Screw Threads
Table 20 Nomenclature
Table A-1 Identification of 60-deg Inch Screw Threads Within the Scope of the ASME B1 Committee
Table D-1 Limits of Size for Selected Combinations of UNS/UNRS Series Threads
Table E-1 Limits of Size for Standard Series Internal and External Threads as Listed in Table 3A of ASME B1.1-1989
Table E-2 Limits as Listed in Table D-1 (Formerly 3B) Prior to ASME B1.1-2003 Edition
NONMANDATORY APPENDICES [Go to Page]
NONMANDATORY APPENDIX A TERMINOLOGY AND IDENTIFICATION OF UNIFIED INCH SCREW THREADS [Go to Page]
A-1 TERMINOLOGY
A-2 IDENTIFICATION
NONMANDATORY APPENDIX B THREAD STRENGTH DESIGN FORMULAS [Go to Page]
B-1 THREAD TENSILE STRESS AREA FOR UN, UNR, AND UNJ THREADS
B-2 THREAD SHEAR DATA FOR UN, UNR, AND UNJ THREADS
B-3 LENGTH OF THREAD ENGAGEMENT
NONMANDATORY APPENDIX C UNIFIED INCH SCREW THREADS — METRIC TRANSLATION
NONMANDATORY APPENDIX D SPECIAL THREADS
NONMANDATORY APPENDIX E CHANGES TO ASME B1.1-1989, TABLES 3A AND 3B
NONMANDATORY APPENDIX F SPECIAL LENGTHS OF ENGAGEMENT SPECIFICATIONS AND DESIGNATIONS [Go to Page]
F-1 SPECIAL LENGTHS OF ENGAGEMENT, LE, SPECIFICATIONS
F-2 METHOD OF DESIGNATING THREADS HAVING SPECIAL LENGTH OF ENGAGEMENT [Go to Page]

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