ASME B1.21M 1997 R2018
$98.04
ASME B1.21M Metric Screw Threads: MJ Profile – Reaffirmed 2018
| Published By | Publication Date | Number of Pages |
| ASME | 1997 | 68 |
This Standard establishes the basic triangular profile for the MJ thread form; provides a system of designations; lists the standard series of diameter/pitch combinations for diameters from 1.6 to 200 mm; and specifies limiting dimensions and tolerances. It specifies the characteristics of the MJ metric series of threads having a minimum 0.15011P radius at the root of the external thread, and also having the minor diameter of the external and internal threads increased above the ASME B1.13M-Metric Screw Threads: M Profile thread form to accommodate the external thread root radius.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | Standards Committee Roster |
| 9 | CONTENTS |
| 11 | 1 General 1.1 Scope 1.2 Field of Application 1.3 Assembly 1.4 Federal Government Use 1.5 References 2.1 Basic Profile |
| 12 | 2 Profile of Thread 2.2 Basic Thread Profile Symbols 2.3 Design Profiles 2.4 Root Radius of the Thread Figures 1 Basic Profile |
| 13 | 3 Series of Threads 4 Thread Characteristics 4.1 Length of Thread Engagement, LE 2 Internal Thread Tolerances |
| 14 | 4.2 Tolerance System 4.3 Limits of Size 3 External Thread Tolerances |
| 15 | 4 Root Radius of External Thread |
| 16 | 4.4 Thread Form Tolerances |
| 17 | 5 Dimensional Accommodation of Coatings and Plating 5.1 Coated External Threads, Tolerance, Position h 5.2 Coating Threads with Dry Film Lubricant 5.3 Coated External Threads, Tolerance Position g 5.4 Coated Internal Threads, Tolerance Position H 5.5 Coated Internal Threads, Tolerance Position G 6 Designation of Threads 6.1 Basic Designation 6.2 Standard Thread Series Designation |
| 18 | 6.3 Designation of Coated Threads 6.4 Designation of Threads Having Modified Crests 6.5 Designation of Threads Having Special Lenght Requirements |
| 19 | 6.6 Designation of Special Series Threads 7 Acceptability |
| 21 | Tables 1 Limit Values, External Thread Root Radius, R (mm) |
| 22 | 2 Metric J Screw Thread Standard Series, mm |
| 24 | 3 Standard Series for Aerospace Screws, Bolts, and Nuts 4 Standard Series for Aerospace Fluid System Fittings |
| 25 | 5 Other Standard Series Preferred Screw Threads |
| 26 | 6 Limiting Dimensions of Metric J Screw Thread Series for Tolerance Class 6H/6g, mm |
| 30 | 7 Limiting Dimensions of Metric J Screw Thread Standard Series, mm |
| 50 | 8 Theoretical Thread Profile Data, mm |
| 52 | 9 Major Diameter Tolerance, External Thread 10 Minor Diameter Tolerance, Internal Thread |
| 53 | 11 Pitch Diameter Tolerance, mm |
| 54 | 12 Allowable Variations in Lead and Equivalent Change in Functional Diameter,mm |
| 60 | 13 Allowable Variations in 30 deg Basic Half-Angle of Screw Threads |
| 61 | Appendices A Coating of Threads |
| 63 | B Symbols for MJ Thread Dimensions and Tolerances |
