{"id":463826,"date":"2024-10-20T10:30:55","date_gmt":"2024-10-20T10:30:55","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/asme-b1-1-2024\/"},"modified":"2024-10-26T19:23:46","modified_gmt":"2024-10-26T19:23:46","slug":"asme-b1-1-2024","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/asme\/asme-b1-1-2024\/","title":{"rendered":"ASME B1.1 2024"},"content":{"rendered":"

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.<\/p>\n

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PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
4<\/td>\nCONTENTS <\/td>\n<\/tr>\n
6<\/td>\nFOREWORD <\/td>\n<\/tr>\n
9<\/td>\nASME B1 COMMITTEE ROSTER <\/td>\n<\/tr>\n
10<\/td>\nCORRESPONDENCE WITH THE B1 COMMITTEE <\/td>\n<\/tr>\n
12<\/td>\n1 GENERAL
1.1 Scope
1.2 Unified Screw Thread Standards
1.3 Thread Forms
1.4 Interchangeability
1.5 Designations
1.6 References <\/td>\n<\/tr>\n
13<\/td>\nFigures
Figure 1 Illustration of Assembly Interference of UNJ-3A Thread and UN-3B Thread in the Maximum Material Condition <\/td>\n<\/tr>\n
14<\/td>\n1.7 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 <\/td>\n<\/tr>\n
15<\/td>\nFigure 2 Basic Profile for UN and UNR Screw Threads
Figure 3 Basic Profile for UNJ Screw Threads <\/td>\n<\/tr>\n
16<\/td>\nFigure 4 Root Radius of UNJ External Thread <\/td>\n<\/tr>\n
17<\/td>\nFigure 5 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Series UN, Classes 1A, 2A, 1B, and 2B <\/td>\n<\/tr>\n
18<\/td>\nFigure 6 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UN, Classes 3A and 3B <\/td>\n<\/tr>\n
19<\/td>\nFigure 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 <\/td>\n<\/tr>\n
20<\/td>\nFigure 8 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UNR, Class 3A and Series UN, Class 3B <\/td>\n<\/tr>\n
21<\/td>\n2.4 Formulas and Nomenclature
3 SCREW THREAD SERIES
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 <\/td>\n<\/tr>\n
22<\/td>\nFigure 9 External UNJ Thread Design Profile and Tolerances <\/td>\n<\/tr>\n
23<\/td>\nFigure 10 Disposition of Diametral Tolerances, Allowance, and Crest Clearance for Unified Inch Screw Thread Series UNJ, Classes 2A and 2B <\/td>\n<\/tr>\n
24<\/td>\nFigure 11 Disposition of Diametral Tolerances and Crest Clearance for Unified Inch Screw Thread Series UNJ, Classes 3A and 3B <\/td>\n<\/tr>\n
25<\/td>\nFigure 12 Internal UNJ Thread Design Profile and Tolerances
Figure 13 Basic Method of Designating Screw Threads <\/td>\n<\/tr>\n
26<\/td>\n3.6 Constant-Pitch-Thread Series Applications
3.7 Fine Threads for Thin-Wall Tubing
4 SCREW THREAD CLASSES
4.1 Thread Classes <\/td>\n<\/tr>\n
27<\/td>\nTables
Table 1 Standard Series Threads (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
29<\/td>\nTable 2A Limits of Size for Standard Series External Threads (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
58<\/td>\nTable 2B Limits of Size for Standard Series Internal Threads (UN and UNJ) <\/td>\n<\/tr>\n
91<\/td>\n5 SCREW THREAD ALLOWANCE AND TOLERANCE
5.1 Allowance
5.2 Pitch Diameter Tolerance, All Classes <\/td>\n<\/tr>\n
92<\/td>\n5.3 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 <\/td>\n<\/tr>\n
93<\/td>\nTable 3 Allowable Variations in Lead and Equivalent Change in Functional Diameter <\/td>\n<\/tr>\n
113<\/td>\n5.7 Disposition of Allowance and Tolerance
5.8 Formulas for Allowance and Tolerance <\/td>\n<\/tr>\n
114<\/td>\n5.9 Lead and Flank Angle Tolerances
5.10 Coated or Plated Threads
5.11 Circular Runout <\/td>\n<\/tr>\n
115<\/td>\nTable 4 Increments in Pitch Diameter Tolerance \u2014 Class 2A (PD Tolerance = 0.0015 3\u221aD + 0.0015\u221aLE + 0.015 3\u221ap2) <\/td>\n<\/tr>\n
117<\/td>\nTable 5 Basic Profile and Constants for Calculation Formulas of Thread Dimensions, in. <\/td>\n<\/tr>\n
121<\/td>\n6 SCREW THREAD DESIGNATION
6.1 Basic Method of Designating
6.2 Method of Designating Coated Threads <\/td>\n<\/tr>\n
122<\/td>\n6.3 Method of Designating Left-Hand Threads <\/td>\n<\/tr>\n
123<\/td>\n6.4 Method of Designating Special Unified Threads
6.5 Designations for Other Threads
6.6 Method of Designating Threads Having Special Length of Engagement <\/td>\n<\/tr>\n
124<\/td>\n6.7 Method of Designating Threads Having Modified Crests
7 DIMENSIONAL ACCOMMODATION OF COATING OR PLATING FOR 60-DEG THREADS
7.1 Introduction <\/td>\n<\/tr>\n
125<\/td>\n7.2 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 <\/td>\n<\/tr>\n
126<\/td>\nFigure 14 Ratio of Pitch Diameter Change to Thickness of Coating on 60-deg Threads <\/td>\n<\/tr>\n
127<\/td>\nFigure 15 Effect of Electrodeposited Coating on 60-deg External Threads <\/td>\n<\/tr>\n
129<\/td>\n7.9 Internal Threads <\/td>\n<\/tr>\n
130<\/td>\n8 LIMITS OF SIZE FOR STANDARD (UN, UNR, AND UNJ) AND SPECIAL (UNS, UNRS, AND UNJS) SERIES OF THREADS
8.1 Standard Series
8.2 Limits of Size
8.3 Formulas for Limits of Size <\/td>\n<\/tr>\n
131<\/td>\nFigure 16 Application of General Thread Symbols <\/td>\n<\/tr>\n
134<\/td>\n8.4 Example of Calculations From Formulas
9 THREAD FORM TOLERANCES
9.1 Form Variation
9.2 Lead and Flank Angle Acceptance <\/td>\n<\/tr>\n
135<\/td>\n10 FORMULAS AND NOMENCLATURE FOR THREAD FORM <\/td>\n<\/tr>\n
136<\/td>\n11 TABLES OF BASIC DIMENSIONS
11.1 Table Content
11.2 Thread Series <\/td>\n<\/tr>\n
137<\/td>\nTable 6 Basic Dimensions for Coarse-Thread Series (UNC, UNRC, and UNJC) <\/td>\n<\/tr>\n
139<\/td>\nTable 7 Basic Dimensions for Fine-Thread Series (UNF, UNRF, and UNJF) <\/td>\n<\/tr>\n
140<\/td>\nTable 8 Basic Dimensions for Extra-Fine-Thread Series (UNEF, UNREF, and UNJEF) <\/td>\n<\/tr>\n
142<\/td>\nTable 9 Basic Dimensions for 4-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
144<\/td>\nTable 10 Basic Dimensions for 6-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
146<\/td>\nTable 11 Basic Dimensions for 8-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
148<\/td>\nTable 12 Basic Dimensions for 12-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
151<\/td>\nTable 13 Basic Dimensions for 16-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
154<\/td>\nTable 14 Basic Dimensions for 20-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
156<\/td>\nTable 15 Basic Dimensions for 28-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
157<\/td>\nTable 16 Basic Dimensions for 32-Thread Series (UN, UNR, and UNJ) <\/td>\n<\/tr>\n
158<\/td>\nTable 17A Outline Guide for Determining Limits of Size of External Threads
Table 17B Outline Guide for Determining Limits of Size of Internal Threads <\/td>\n<\/tr>\n
159<\/td>\nTable 18A Examples of External 2A Screw Threads <\/td>\n<\/tr>\n
161<\/td>\nTable 18B Example of External 3A Screw Threads <\/td>\n<\/tr>\n
164<\/td>\nTable 18C Examples of Internal 2B Screw Threads <\/td>\n<\/tr>\n
166<\/td>\nTable 18D Example of Internal 3B Screw Threads <\/td>\n<\/tr>\n
169<\/td>\nTable 19 Allowable Variation in 30-deg Basic Half Angle of External and Internal Screw Threads <\/td>\n<\/tr>\n
170<\/td>\nTable 20 Nomenclature <\/td>\n<\/tr>\n
172<\/td>\nNONMANDATORY APPENDICES
NONMANDATORY APPENDIX A TERMINOLOGY AND IDENTIFICATION OF UNIFIED INCH SCREW THREADS
A-1 TERMINOLOGY
A-2 IDENTIFICATION <\/td>\n<\/tr>\n
173<\/td>\nFigure A-1 Identification of 60-deg Inch Screw Threads Within the Scope of the ASME B1 Committee <\/td>\n<\/tr>\n
174<\/td>\nTable A-1 Identification of 60-deg Inch Screw Threads Within the Scope of the ASME B1 Committee <\/td>\n<\/tr>\n
175<\/td>\nNONMANDATORY APPENDIX B THREAD STRENGTH DESIGN FORMULAS
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 <\/td>\n<\/tr>\n
176<\/td>\nNONMANDATORY APPENDIX C UNIFIED INCH SCREW THREADS \u2014 METRIC TRANSLATION <\/td>\n<\/tr>\n
177<\/td>\nNONMANDATORY APPENDIX D SPECIAL THREADS <\/td>\n<\/tr>\n
178<\/td>\nTable D-1 Limits of Size for Selected Combinations of UNS\/UNRS Series Threads <\/td>\n<\/tr>\n
186<\/td>\nNONMANDATORY APPENDIX E CHANGES TO ASME B1.1-1989, TABLES 3A AND 3B <\/td>\n<\/tr>\n
187<\/td>\nTable E-1 Limits of Size for Standard Series Internal and External Threads as Listed in Table 3A of ASME B1.1-1989 <\/td>\n<\/tr>\n
198<\/td>\nTable E-2 Limits as Listed in Table D-1 (Formerly 3B) Prior to ASME B1.1-2003 Edition <\/td>\n<\/tr>\n
204<\/td>\nNONMANDATORY APPENDIX F SPECIAL LENGTHS OF ENGAGEMENT SPECIFICATIONS AND DESIGNATIONS
F-1 SPECIAL LENGTHS OF ENGAGEMENT, LE, SPECIFICATIONS <\/td>\n<\/tr>\n
205<\/td>\nF-2 METHOD OF DESIGNATING THREADS HAVING SPECIAL LENGTH OF ENGAGEMENT <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

ASME B1.1-2024 Unified Inch Screw Threads (UN, UNR, and UNJ Thread Forms)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASME<\/b><\/a><\/td>\n2024<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":463830,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2643],"product_tag":[],"class_list":{"0":"post-463826","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-asme","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/463826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/463830"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=463826"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=463826"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=463826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}