ASME B1.12 1987 R2018
$98.04
ASME B1.12 Class 5 Interference-Fit Thread – Reaffirmed 2018
| Published By | Publication Date | Number of Pages |
| ASME | 1987 | 74 |
This Standard provides dimensional tables for external and internal plastic flow interference- fit (Class 5) threads of modified National thread form in the coarse thread series (NC) in sizes 0.250 in. through 1.500 in. This is not the ANSI B1.1 UN thread form. It is intended that designs conforming with this Standard will provide adequate torque conditions which fall within the limits shown in Table 8. The minimum torque is intended to be sufficient to insure that externally threaded members will not loosen in service, the maximum torque establishes a ceiling below which seizing, galling, or torsional failure of the externally threaded components is reduced. This Standard provides for the maximum allowable interference. Appendices A,B,C, and D contain useful information that is supplementary to this Standard, such as reprints of the obsolete tentative and alternate Class 5 standards, US Navy ship specifications for elastic interference-fit coarse thread series from 0.250 in through 2.000 in, US Navy ship specifications for Class 5 Modified which includes nickel-copper-aluminum alloy external threads, and an interference metal comparison of standard to nonstandard interference-fit threads.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 9 | Standards Committee Roster |
| 11 | Contents |
| 12 | Appendices |
| 13 | Figures Tables |
| 15 | 1 General 1.1 Scope 1.2 Field of Application 1.3 Reference Documents 1.4 Acceptability |
| 16 | 1.5 Reference Temperature 1.6 Units of Measure 1.7 Federal Government Use 2 Terminology 2.1 General 2.2 Additional Definitions 3 Thread Designations 3.1 Class 5 External Thread |
| 17 | 3.2 Class 5 Internal Thread 4 Screw Thread Profile 4.1 Basic Profile 4.2 Design Profiles 4.3 Maximum and Minimum Interference 4.4 Formulas 5 Screw Thread Series 5.1 Standard Series 5.2 Fine Pitch Series |
| 18 | Figures 1 Basic Thread Profile |
| 19 | 2 Design Profile for External NC-5 HF/CSF/ONF Thread |
| 20 | 3 Design Profile for Internal NC-5 IF/INF Thread |
| 21 | 4 Maximum and Minimum Interference |
| 22 | 6 Screw Thread Class 7 Screw Thread Allowances and Tolerances 7.1 Allowances 7.2 Tolerances 8 Standard Series Threads and Formulas for Limits of Size 8.1 Basic Dimensions for Standard Series Threads Tables 1 Standard NC-5 Thread Series |
| 23 | 2 Allowances for Coarse Thread Series 3 Tolerances for Pitch Diameter, Major Diameter, and Minor Diameter for Coarse Thread Series |
| 24 | 9 Thread Characteristics 4 Basic Dimensions for Coarse Thread Series |
| 25 | 5 Thread Constants |
| 26 | 9.1 Limits of Size 9.2 Pitch Diameter Limits 9.3 Major Diameter Limits 9.4 Minor Diameter Limits 9.5 Other Screw Thread Characteristics 9.6 Length of Engagement 10 Notes on Product Design and Application 10.1 Conditions of Usage 10.2 External Threaded Products |
| 27 | 5 Illustration of LE, Ts, Tolerances of Ts, and Th Required for Assembled Threads |
| 28 | 6 External Thread Dimensions for Class 5 Standard |
| 29 | 7 Internal Thread Dimensions for Class 5 Standard |
| 30 | 8 Interferences, Engagement Lengths, and Torques for Class 5 Standard |
| 32 | 10.3 Internal Threaded Products 10.4 Lead and Angle Variations 10.5 Cavity Space for Interference Material 10.6 Thread Axis Position 10.7 Surface Roughness |
| 33 | 9 Maximum Allowable Variations in Lead and Maximum Equivalent Change in Functional Diameter |
| 34 | 10.8 Lubrication 10.9 Driving Speed 10.10 Relation of Driving Torque to Length of Engagement 10.11 Breakloose Torques 11 Product Screw Thread Acceptability 11.1 Gaging Systems 10 Maximum Allowable Variation in 30 deg. Basic Half-Angle of External and Internal Screw Threads |
| 35 | 11.2 Product Thread Characteristics Conformance Requirements Over Length of Engagement for Gaging Systems 22 and 23 12 Torque |
| 36 | 11 Working Gages |
| 39 | 12 Setting Gages |
| 41 | A Obsolete Tentative Standard and Alternate Standard for Class 5 Interference-Fit Thread A1 Introduction A2 Tentative Standard A3 Alternate Standard |
| 42 | A1 Illustration of Tolerances, Allowances, and Crest Clearances for Tentative and Alternate Class 5 Fit for Threaded Stu |
| 43 | A2 Illustration of Loosest Condition for Tentative Class 5 Wrench Fit for Threaded Studs, 1/2 in., 13 Threads, Set in Ha A3 Illustration of Tightest Condition for Tentative Class 5 Wrench Fit for Threaded Studs, 1/2 in., 13 Threads, Set in H |
| 44 | A1 Tentative Class 5 Wrench Fit for Threaded Studs, Allowances and Tolerances for Studs and Tapped Holes, Coarse Thread |
| 45 | A2 Tentative Class 5 Wrench Fit for Threaded Studs, Allowances and Tolerances for Studs and Tapped Holes, Fine Threaded |
| 46 | A3 Limiting Dimensions for Tentative Class 5 Wrench Fit for American National Coarse Thread Series, Steel Studs Set in |
| 47 | A4 Limiting Dimensions for Tentative Class 5 Wrench Fit for American National Fine Thread Series, Steel Studs Set in |
| 48 | A4 Illustration of Loosest Condition for Alternate Class 5 Fit for Threaded Studs, 1/2 in., 13 Threads, Set in Hard Mate A5 Illustration of Tightest Condition for Alternate Class 5 Fit for Threaded Studs, 1/2 in., 13 Threads, Set in Hard Mat |
| 49 | A5 Alternate Class 5 Fit for Threaded Studs, Allowances and Tolerances for Studs and Tapped Holes, Coarse Threaded Stud A6 Alternate Class 5 Fit for Threaded Studs, Allowances and Tolerances for Studs and Tapped Holes, Fine Threaded Studs |
| 50 | A7 Limiting Dimensions for Alternate Class 5 Fit, American National Coarse Thread Series, Steel Studs Set in Hard Mater |
| 51 | A8 Limiting Dimensions for Alternate Class 5 Fit, American National Fine Thread Series, Steel Studs Set in Hard Materia |
| 52 | A9 Limiting Dimensions of Setting Plug and Thread Working Gages and Plain Diameter Gages for Alternate Class 5 Fit Thre |
| 53 | A10 Limiting Dimensions of Thread Working Gages and Plain Diameter Gages for Alternate Class 5 Fit Tapped Holes, Americ |
| 54 | A11 Limiting Dimensions of Setting Plug and Thread Working Gages and Plain Diameter Gages for Alternate Class 5 Fit |
| 55 | A12 Limiting Dimensions of Thread Working Gages and Plain Diameter Gages for Alternate Class 5 Fit Tapped Holes, Americ |
| 57 | B Specifications for Elastic Interference-Fit Thread B1 Introduction B2 Thread Designation B3 External and Internal Threads Compared to NC-5 |
| 58 | B4 Application Practice for New and Reworked External and Internal Threads |
| 59 | B5 Gaging |
| 60 | B1 External Thread Dimensions for NC-5 HFM B2 Internal Thread Dimensions for NC-5 IFM |
| 61 | B3 Engagement Length, Hole Depth, Interference, and Torque for NC-5 HFM and NC-5 IFM |
| 62 | B4 Setting Gages for NC-5 HFM and NC-5 IFM |
| 63 | C Class 5 Modified Specifications for Plastic Flow Interference-Fit Thread with Addition of K Monel External Thread C1 Introduction C2 Additions to Thread Designation Letters C3 External and Internal Threads Compared to ASME/ANSI B1.12 Class 5 Threads |
| 64 | C4 Torque and Length of Engagement C5 Application Practice for New and Reworked External and Internal Threads C6 Gaging C1 External Thread Dimensions for Class 5 Modified for Nickel-Copper-Aluminium (K Monel) |
| 65 | C2 External Thread Dimensions for Class 5 Modified for Greater Cavity Space |
| 66 | C3 Internal Thread Dimensions for Class 5 Modified |
| 67 | C4 Interference on Pitch Diameter for Class 5 Modified |
| 69 | D Comparison of Interference Metal for the Thread Assemblies Tabulated in the Appendices With the American National D1 Explanation for Table D1 D2 Formulas for Volume of Interference Metal per Turn |
| 70 | D1 Thread Assemblies Compared by Percentage of Interference Metal per Turn |
