ASME B1.1 2003 R2018
$98.04
ASME B1.1 Unified Inch Screw Threads, (UN and UNR Thread Form) – Reaffirmed 2018
| Published By | Publication Date | Number of Pages |
| ASME | 2003 | 192 |
This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads. (In order to emphasize that unified screw threads are based on inch modules, they may be denoted unified inch screw threads.) Several variations in thread form have been developed for unified threads; however, this Standard covers only [Unified] UN and UNR [external threads only] thread forms. For easy reference, a metric translation of this Standard has been incorporated as Nonmandatory Appendix C. Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of this Standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | CONTENTS |
| 6 | FIGURES TABLES |
| 7 | NONMANDATORY APPENDICES |
| 8 | FOREWORD |
| 10 | COMMITTEE ROSTER |
| 11 | 1 GENERAL 1.1 Scope 1.2 Unified Screw Thread Standards 1.3 UN and UNR Screw Threads 1.4 Interchangeability 1.5 Designations 1.6 Reference Documents |
| 12 | 1.7 Acceptability 1.8 Reference Temperature 1.9 Units of Measure 1.10 Federal Government Use 2 SCREW THREAD PROFILE 2.1 Scope 2.2 Basic Profile 2.3 Design Profiles 2.4 Formulas and Symbols 3 SCREW THREAD SERIES 3.1 Thread Series Definition 3.2 Order of Selection |
| 13 | 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 1 Basic Profile for UN and UNR Screw Threads |
| 14 | 2 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Classes 1A, 2A, 1B, and 2B |
| 15 | 3 Disposition of Diametral Tolerances and Crest Clearances for Unified Inch Screw Thread Classes 3A and 3B |
| 16 | 1 Standard Series Threads (UN/UNR) |
| 17 | 3.7 Fine Threads for Thin-Wall Tubing |
| 18 | 2 Limits of Size for Standard Series Threads (UN/UNR) |
| 46 | 4 SCREW THREAD CLASSES 4.1 Thread Classes 4.2 Combinations of Classes 5 SCREW THREAD ALLOWANCE AND TOLERANCE 5.1 Allowance 5.2 Pitch Diameter Tolerance, All Classes |
| 47 | 5.3 Special Lengths of Engagement, LE |
| 48 | 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter |
| 64 | 5.4 Minor Diameter Tolerance and Allowance for External Threads 5.5 Major Diameter Tolerance for Internal Threads |
| 65 | 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 |
| 66 | 4 Increments in Pitch Diameter Tolerance — Class 2A |
| 68 | 5.9 Lead and Flank Angle Tolerances 5.10 Coated or Plated Threads 5.11 Circular Runout 6 SCREW THREAD DESIGNATION 6.1 Basic Method of Designating |
| 69 | 5 Thread Form Data |
| 71 | 6.2 Method of Designating Coated Threads |
| 72 | 6.3 Method of Designating Left-Hand Threads 6.4 Method of Designating UNS Threads 6.5 Designations for Other Threads |
| 73 | 6.6 Method of Designating Threads Having Special Length of Engagement 6.7 Method of Designating Threads Having Modified Crests |
| 74 | 7 DIMENSIONAL ACCOMMODATION OF COATING OR PLATING FOR 60-deg THREADS 7.1 Introduction 7.2 Material Limits for Coated Threads 7.3 Dimensional Effects of Coating 7.4 External Thread With Allowance Available for Coating 7.5 External Thread With No Allowance for Coating |
| 75 | 4 Ratio of Pitch Diameter Change to Thickness of Coating on 60-deg Threads |
| 76 | 7.6 Internal Threads 5 Effect of Electrodeposited Coatings on 60-deg External Threads |
| 77 | 7.7 Electrodeposited Coatings 7.8 Other Considerations 8 STANDARD SERIES THREADS (UN/UNR) AND LIMITS OF SIZE FOR STANDARD SERIES AND UNS/UNRS SERIES THREADS 8.1 Standard Series 8.2 Limits of Size 8.3 Formulas for Limits of Size |
| 78 | 8.4 Example of Calculations From Formulas 9 LEAD AND ANGLE TOLERANCES 9.1 Lead and Flank Angle Acceptance |
| 79 | 10 FORMULAS AND SYMBOLS FOR THREAD FORM 10.1 Thread Form Formulas and Symbols |
| 80 | 11 TABLES OF BASIC DIMENSIONS 11.1 Table Content 11.2 Thread Series 6 Application of General Thread Symbols |
| 82 | 6 Basic Dimensions for Coarse-Thread Series (UNC/UNRC) |
| 83 | 7 Basic Dimensions for Fine-Thread Series (UNF/UNRF) |
| 84 | 8 Basic Dimensions for Extra-Fine-Thread Series (UNEF/UNREF) |
| 85 | 9 Basic Dimensions for 4-Thread Series (4-UN/4-UNR) |
| 86 | 10 Basic Dimensions for 6-Thread Series (6-UN/6-UNR) |
| 87 | 11 Basic Dimensions for 8-Thread Series (8-UN/8-UNR) |
| 89 | 12 Basic Dimensions for 12-Thread Series (12-UN/12-UNR) |
| 91 | 13 Basic Dimensions for 16-Thread Series (16-UN/16-UNR) |
| 93 | 14 Basic Dimensions for 20-Thread Series (20-UN/20-UNR) |
| 94 | 15 Basic Dimensions for 28-Thread Series (28-UN/28-UNR) |
| 95 | 16 Basic Dimensions for 32-Thread Series (32-UN/32-UNR) |
| 96 | 17A Outline Guide for Determining Limits of Size of External Threads 17B Outline Guide for Determining Limits of Size of Internal Threads |
| 97 | 18A Examples of External Screw Threads |
| 100 | 18B Examples of Internal Screw Threads |
| 102 | 19 Allowable Variation in 30 deg Basic Half Angle of External and Internal Screw Threads |
| 103 | 20 General Symbols |
| 105 | A TERMINOLOGY AND IDENTIFICATION OF UNIFIED INCH SCREW THREADS |
| 107 | B THREAD STRENGTH DESIGN FORMULAS |
| 108 | C UNIFIED INCH SCREW THREADS — METRIC TRANSLATION |
| 144 | D SPECIAL THREADS |
| 171 | E CHANGES TO ASME B1.1-1989 TABLES 3A AND 3B |
