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ASME B1.21M Metric Screw Threads: MJ Profile - Reaffirmed 2013, 1997
- Foreword
- Standards Committee Roster
- CONTENTS
- 1 General [Go to Page]
- 1.1 Scope
- 1.2 Field of Application
- 1.3 Assembly
- 1.4 Federal Government Use
- 1.5 References
- 2 Profile of Thread [Go to Page]
- 2.1 Basic Profile
- 2.2 Basic Thread Profile Symbols
- 2.3 Design Profiles
- 2.4 Root Radius of the Thread
- 3 Series of Threads
- 4 Thread Characteristics [Go to Page]
- 4.1 Length of Thread Engagement, LE
- 4.2 Tolerance System
- 4.3 Limits of Size
- 4.4 Thread Form Tolerances
- 5 Dimensional Accommodation of Coatings and Plating [Go to Page]
- 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 [Go to Page]
- 6.1 Basic Designation
- 6.2 Standard Thread Series Designation
- 6.3 Designation of Coated Threads
- 6.4 Designation of Threads Having Modified Crests
- 6.5 Designation of Threads Having Special Lenght Requirements
- 6.6 Designation of Special Series Threads
- 7 Acceptability
- Figures [Go to Page]
- 1 Basic Profile
- 2 Internal Thread Tolerances
- 3 External Thread Tolerances
- 4 Root Radius of External Thread
- Tables [Go to Page]
- 1 Limit Values, External Thread Root Radius, R (mm)
- 2 Metric J Screw Thread Standard Series, mm
- 3 Standard Series for Aerospace Screws, Bolts, and Nuts
- 4 Standard Series for Aerospace Fluid System Fittings
- 5 Other Standard Series Preferred Screw Threads
- 6 Limiting Dimensions of Metric J Screw Thread Series for Tolerance Class 6H/6g, mm
- 7 Limiting Dimensions of Metric J Screw Thread Standard Series, mm
- 8 Theoretical Thread Profile Data, mm
- 9 Major Diameter Tolerance, External Thread
- 10 Minor Diameter Tolerance, Internal Thread
- 11 Pitch Diameter Tolerance, mm
- 12 Allowable Variations in Lead and Equivalent Change in Functional Diameter,mm
- 13 Allowable Variations in 30 deg Basic Half-Angle of Screw Threads
- Appendices [Go to Page]
- A Coating of Threads
- B Symbols for MJ Thread Dimensions and Tolerances [Go to Page]
