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ASME B1.13M-2005 (R2020): Metric Screw Threads: M Profile, 2005
- CONTENTS
- FOREWORD
- COMMITTEE ROSTER
- 1 GENERAL [Go to Page]
- 1.1 Scope
- 1.2 Interchangeability [Go to Page]
- 1.2.1 Assembly.
- 1.3 References
- 1.4 Acceptability
- 1.5 Reference Temperature
- 1.6 General Symbols
- 1.7 Units
- 1.8 Federal Government Use
- 2 TERMINOLOGY [Go to Page]
- 2.1 Definitions
- 3 SCREW THREAD PROFILE [Go to Page]
- 3.1 Basic M Thread Profile
- 3.2 Design M Profiles [Go to Page]
- 3.2.1 Internal Thread.
- 3.2.2 External Thread.
- 3.3 Crest and Root Forms [Go to Page]
- 3.3.1 Rounded Crest and Root Forms.
- 3.3.2 External Thread Root.
- 3.3.3 Internal Thread Root.
- 4 SERIES OF THREADS [Go to Page]
- 4.1 Standard Coarse Pitch General Purpose and Mechanical Fastener Series, M Profile
- 4.2 Standard Fine Pitch M Profile Screw Threads
- 4.3 Preferred Sizes
- 4.4 ISO Metric Thread Series
- 5 ALLOWANCES AND TOLERANCES [Go to Page]
- 5.1 ISO System of Limits and Fits as Applied to Screw Threads [Go to Page]
- 5.1.1 General.
- 5.1.2 Basic Size.
- 5.1.3 Upper Deviation.
- 5.1.4 Lower Deviation.
- 5.1.5 Fundamental Deviations Allowances.
- 5.1.6 Fits.
- 5.1.7 Tolerance.
- 5.2 Tolerance Grade
- 5.3 Tolerance Position
- 5.4 Allowance/Tolerance Formulas and Tables
- 5.5 Selected Tolerance Classes [Go to Page]
- 5.5.1 External Thread Tolerance Classes.
- 5.5.2 Internal Thread Tolerance Class.
- 5.6 Length of Thread Engagement [Go to Page]
- 5.6.1 Normal Length of Thread Engagement.
- 5.6.2 Short and Long Lengths of Thread Engagement When Gaged With Normal Length Contacts.
- 5.7 Circular Runout [Go to Page]
- 5.7.1 Internal Thread.
- 5.7.2 External Thread.
- 5.8 Lead and Flank Angle Tolerances
- 5.9 Coated or Plated Threads
- 6 DESIGN FORMULAS AND TABULATED VALUES FOR ALLOWANCES AND TOLERANCES [Go to Page]
- 6.1 General
- 6.2 Rounding Procedure for Tabulated Values
- 6.3 Allowances Fundamental Deviations
- 6.4 Length of Thread Engagement
- 6.5 Crest Diameter Tolerances [Go to Page]
- 6.5.1 Tolerances for Minor Diameter of Internal Thread, TD inf.1. [Go to Page]
- 6.5.1.1
- 6.5.2 Tolerances for Major Diameter of External Thread, Td, Grade 6. [Go to Page]
- 6.5.2.1
- 6.6 Pitch Diameter Tolerances [Go to Page]
- 6.6.1 Tolerances for Pitch Diameter of External Thread, Td inf.2. [Go to Page]
- 6.6.1.1
- 6.6.2 Tolerances for Pitch Diameter of Internal Thread, TD inf.2.
- 7 DESIGNATION OF SCREW THREADS [Go to Page]
- 7.1 General
- 7.2 Designation of Standard Screw Threads [Go to Page]
- 7.2.1 Designation of Left-Hand Thread.
- 7.2.2 Designation of Identical Tolerance Classes.
- 7.2.3 Designations Using All Capital Letters.
- 7.3 Designation of Thread Fit
- 7.4 Designation of Rounded Root External Thread [Go to Page]
- 7.4.1 Modified ISO 68Ã1 Thread With Radius Root r min. = 0.125P.
- 7.4.2 Designation of Special Rounded Root Thread.
- 7.5 Designation of Threads Having Modified Crests
- 7.6 Designation of Special Threads
- 7.7 Designation of Multiple Start Threads
- 7.8 Designation of Coated or Plated Threads [Go to Page]
- 7.8.1 Designation of Coated or Plated M Threads.
- 7.8.2
- 7.9 Designation of Threads With Adjusted Size Limits
- 8 DIMENSIONAL ACCOMMODATION OF COATING OR PLATING FOR 60 deg THREADS [Go to Page]
- 8.1 Introduction
- 8.2 Material Limits for Coated Threads
- 8.3 Dimensional Effects of Coating
- 8.4 External Thread With Allowance Available for Coating [Go to Page]
- 8.4.1 Maximum and Minimum Coating Thickness Specified.
- 8.4.2 Only Nominal or Minimum Coating Thickness Specified.
- 8.5 External Thread With No Allowance for Coating [Go to Page]
- 8.5.1 Maximum and Minimum Coating Thickness Specified.
- 8.5.2 Only Nominal or Minimum Coating Thickness Specified.
- 8.5.3 Adjusted Size Limits.
- 8.5.4 Strength.
- 8.6 Internal Threads [Go to Page]
- 8.6.1 Maximum and Minimum Coating Thickness Specified.
- 8.6.2 Only Nominal or Minimum Coating Thickness Specified.
- 8.6.3 Adjusted Size Limits.
- 8.6.4 Strength.
- 8.7 Electrodeposited Coatings
- 8.8 Other Considerations
- 9 LIMITS OF SIZE [Go to Page]
- 9.1 Standard Thread Series
- 9.2 Determination of Size Limits
- 9.3 Formulas for Calculating Limiting Dimensions for M Profile Screw Threads [Go to Page]
- 9.3.1 Internal Thread
- 9.3.2 External Thread
- 9.4 Examples of Calculations of Size Limits [Go to Page]
- 9.4.1 External Screw Thread, Standard Size.
- 9.4.2 Internal Metric Screw Thread, Standard Size.
- 9.4.3 Metric External Screw Thread, Non-Standard Size.
- 9.4.4 Internal Metric Screw Thread, Non-Standard Size.
- 10 LEAD AND FLANK ANGLE TOLERANCES [Go to Page]
- 10.1 Lead and Flank Angle Acceptance [Go to Page]
- 10.1.1
- 10.1.2
- 10.1.3
- 10.1.4
- 10.1.5
- 10.1.6
- FIGURES [Go to Page]
- 1 Basic M Thread Profile (ISO 68-1 Basic Profile)
- 2 Internal Thread, Design M Profile With No Allowance (Fundamental Deviation) (Maximum Material Condition)
- 3 External Thread, Design M Profile With No Allowance (Fundamental Deviation) (Flanks at Maximum Material Condition)
- 4 Metric Tolerance System for Screw Threads
- 5 M Profile, External Thread Root, Upper and Lower Limiting Profiles for r min.p0.125P and for Flat Root Form (Shown for Tolerance Position g)
- 6 Ratio of Pitch Diameter Change to Thickness of Coating on 60 deg Threads
- 7 Effects of Electrodeposited Coating on 60 deg External Threads
- 8 Internal Thread — Limiting M Profile, Tolerance Position H
- 9 External Thread — Limiting M Thread Profile
- TABLES [Go to Page]
- 1 General Symbols
- 2 Thread Data, M Profile
- 3 Limit Values for M Profile Minimum Rounded Root Radius
- 4 Standard Coarse Pitch M Profile General Purpose and Mechanical Fastener Series
- 5 Standard Fine Pitch M Profile Screw Threads
- 6 ISO 261 Diameter/Pitch Combinations From Which the Standards Were Selected
- 7 Length of Thread Engagement (ISO 965-1)
- 8 Examples of Tolerance Classes Required for Normal Gage Length Contacts With Various Thread Engagement Lengths
- 9 Minor Diameter Tolerances of Internal Thread, TD1 (ISO 965-1)
- 10 Major Diameter Tolerances of External Thread, Td (ISO 965-1)
- 11 Pitch Diameter Tolerance of External Thread, Td2 (ISO 965-1)
- 12 Pitch Diameter Tolerance of Internal Thread, TD2 (ISO 965-1)
- 13 Allowance (Fundamental Deviation) for Internal and External Threads (ISO 965-1)
- 14 External Thread - Limiting Dimensions M Profile
- 15 Internal Thread — Limiting Dimensions M Profile
- 16A Example of External Screw Thread, Standard Size
- 16B Example of Internal Metric Screw Thread, Standard Size
- 16C Example of External Metric Screw Thread, Non-Standard Size
- 16D Example of Internal Metric Screw Thread, Non-Standard Size
- 17 Allowable Variations in Lead and Equivalent Change in Functional Diameter
- 18 Allowable Variations in 30 deg Basic Half-Angle of Screw Threads
- NONMANDATORY APPENDICES [Go to Page]
- A STANDARD RULES FOR ROUNDING
- B THREAD STRENGTH DESIGN FORMULAS [Go to Page]
- B-1 THREAD TENSILE STRESS AREA
- B-2 THREAD SHEAR AREA
- B-3 LENGTH OF THREAD ENGAGEMENT
- C LIMITING DIMENSIONS M PROFILE SCREW THREADS -- INCH TRANSLATION
- D BASIC DIMENSIONS FOR ISO SERIES METRIC SCREW THREADS FROM ISO 724
- E OVERTAPPED NUT THREAD CLASS 6AX
- F INTERNAL THREAD ALLOWANCE FUNDAMENTAL DEVIATION TOLERANCE POSITION E [Go to Page]
