ASME B1.5 1997 R2014
$98.04
ASME B1.5 Acme Screw Threads – Reaffirmed: 2014
| Published By | Publication Date | Number of Pages |
| ASME | 1997 | 128 |
This Standard provides for two general applications of Acme threads: namely, general purpose and centralizing. The limits and tolerances in this Standard relate to single-start Acme threads and may be used, if considered suitable, for multiple-start Acme threads. The latter threads are used to provide relatively fast traversing motion when necessary. The three classes (2G, 3G, and 4G) of general purpose threads have clearances on all diameters for free movement. This thread relies on the thread flanks to maintain concentric operation. The three classes of centralizing threads have a limited clearance at the major diameters of the external and internal threads so that a bearing at the major diameter maintains approximate alignment of the thread axis and prevents wedging on the flanks of the threads. For any combination of the three classes of threads covered in this Standard, some end play or backlash will result. This is unavoidable for interchangeable products. When backlash or end play is objectionable, some mechanical means should be provided to eliminate the condition. In any case, sufficient end play must be left to provide a close running fit. In addition to limiting dimensions for the standard series of diameters and pitches of ACME single-start threads, tables of tolerances, in terms of pitch and diameter, provide for a wide choice of diameters for a given standard pitch. By using the formulas for diameter and pitch increments, the pitch diameter tolerances for special diameters and pitches can be determined for each class. Formulas and data are also provided for allowances on external threads and major and minor diameter allowances and tolerances. The Appendices provide text and dimensions on the following: (a) Alternate Centralizing ACME Threads; (b) Multiple-Start ACME Threads; (c) General Purpose ACME Threads, Class 5G; (d) Centralizing ACME Threads, Classes 5C and 6C; (e) Three-Wire Method of Measurement of Pitch Diameter of 29 deg External ACME Screw Threads; (f) Ball Methods for Internal Pitch Diameter Measurement of 29 deg ACME Screw Threads; (g) Go Gage Compensation, Calculation of Flank Angle, Limit Gaging of Setting Rings, and Gaging Problem Areas; (h) Tolerances for ACME Screw Thread Gages over 5 in.; (i) Determining Limits of Size for Special Diameter/Pitch Combinations.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 7 | Standards Committee Roster |
| 9 | Contents |
| 10 | Figures |
| 11 | Tables |
| 12 | Nonmandatory Appendices |
| 13 | 1 General 1.1 Scope 1.2 Federal Government Use 1.3 References |
| 14 | 1.4 Reference Temperature 1.5 Units of Measure 1.6 Terminology 1.7 Computer-Generated Size, 2 Specifications for General Purpose Acme Screw Threads 2.1 Angle of Thread 2.2 Pitch and Lead of Thread 2.3 Height of Thread 2.4 Thickness of Thread 2.5 Allowance (Minimum Clearance) at Major and Minor Diameters 2.6 Chamfers and Fillets 2.7 Basic Thread Form Dimensions 2.8 General Purpose Standard Acme Thread Series |
| 15 | 2.9 Classification and Tolerances, General Purpose Acme Threads 2.10 Basic Diameters 2.11 Length of Engagement 2.12 Tolerances 1 General Purpose Acme Screw Thread Form, Design Dimensions |
| 16 | 1 Profile for Acme Screw Thread |
| 17 | 2 Design Profile for External and Internal General Purpose Acme Thread |
| 18 | 3 Disposition of Allowances, Tolerances, and Crest Clearances for General Purpose Single-Start Acme Threads (All Classes) |
| 19 | 2 Basic Diameters and Thread Data for General Purpose Single-Start Acme Screw Threads, Standard Series |
| 21 | 3 Tolerances on Major and Minor Diameters of General Purpose External and Internal Single-Start Threads 4 Tolerances and Allowances for Major and Minor Diameters, General Purpose Acme Single-Start Screw Threads |
| 22 | 5 Pitch Diameter Tolerances for Single-Start Acme Screw Threads, Classes 2G and 2C |
| 24 | 6 Pitch Diameter Tolerances for Single-Start Acme Screw Threads, Classes 3G and 3C |
| 25 | 2.13 Allowances (Minimum Clearance) (es) for Pitch Diameter 2.14 Limits of Size 2.15 Thread Designations |
| 26 | 7 Pitch Diameter Tolerances for Single-Start Acme Screw Threads, Classes 4G and 4C |
| 27 | 2.16 Formulas for Determining Diameters |
| 28 | 2.17 Maximum-Material Profile Option 3 Specifications for Centralizing Acme Screw Threads 3.1 Angle of Thread 3.2 Pitch and Lead of Thread 8 Tolerances on 14.5 deg Flank Angle for External and Internal Product Threads |
| 29 | 3.3 Height of Thread 3.4 Thickness of Thread 3.5 Allowance (Minimum Clearance) at Major and Minor Diameters 9 External Pitch Diameter Allowances (es) for Single-Start Acme Screw Threads, |
| 30 | 10 Limiting Dimensions and Tolerances for General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G,3G, and 4G |
| 33 | 3.6 Chamfers and Fillets 3.7 Basic Thread Form Dimensions 3.8 Standard Centralizing Acme Thread Series 3.9 Classification and Tolerances, Centralizing Acme Threads 11 Centralizing Acme Screw Thread Form, Basic Dimensions |
| 34 | 4 Design Profile for External and Internal Centralizing Acme Thread |
| 35 | 5 Disposition of Allowances, Tolerances, and Crest Clearances for Centralizing Single-Start Acme Threads, Classes 2C,3C, and 4C |
| 36 | 3.10 Basic Diameters 3.11 Length of Engagement 3.12 Tolerances 12 Centralizing Acme Single-Start Screw Threads, Basic Diameters and Thread Data |
| 37 | 13 Tolerances on Major and Minor Diameters of Single-Start Centralizing External and Internal Threads |
| 38 | 14 Tolerances and Allowances for Major Diameter, Centralizing Single-Start Acme Screw Threads |
| 39 | 15 Limiting Dimensions and Tolerances for Centralizing Single-Start Acme Screw Threads, Standard Series, Classes 2C,3C, and 4C |
| 41 | 3.13 Allowances (Minimum Clearance) (es) 3.14 Limits of Size 3.15 Thread Designations 3.16 Formulas for Determining Diameters |
| 42 | 3.17 Maximum-Material Profile Option 4 Gages for General Purpose Acme Threads 4.1 Measurement Uncertainty Estimates 16 Estimated Measurement Uncertainty Values for Screw Thread Gage Elements |
| 43 | 4.2 Application 4.3 Gage Blanks 4.4 Gage Tolerances 6 Gage Acceptance Using Measurement Uncertainty |
| 44 | 4.5 Gages for External Threads 17 Tolerances for Go and Not Go Thread Gages, Working and Setting, General Purpose Single-Start Acme Screw Threads (0.250 in.Through 5.000 in.) |
| 45 | 18 ASME B47.1 Go Gage Blank Lengths |
| 46 | 19 Go Setting Plug Gages for Working Adjustable Ring Gages and Indicating Gages for External Thread and Go Working Plug Gages for Internal Thread, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G,3G, and 4G |
| 49 | 7 Maximum-Material Go Functional Limit for External Thread |
| 50 | 8 Indicating Thread Gages – Maximum-Material Go Functional Diameter Limit and Size for External Thread |
| 51 | 9 Go Thread Form – Full-Form and Truncated Setting Plug Gage for External Thread 10 Not Go Functional Diameter Limit for External Thread |
| 52 | 11 Indicating Thread Gages – Minimum-Material Pitch Diameter Limit and Size, Cone and Vee, for External Thread |
| 53 | 12 Indicating Thread Gages – Minimum-Material Thread Groove Diameter Limit and Size for External Thread |
| 54 | 13 Thread Form of Full-Form and Truncated Thread Setting Plug Gage for External Thread Not Go Thread Gage |
| 55 | 14 Indicating Plain Diameter Gages – Maximum/Minimum Major Diameter Limit and Size for External Thread |
| 56 | 15 Indicating Diameter Gages – Maximum/Minimum Minor Diameter Limit and Size for External Thread |
| 57 | 16 Indicating Thread Gages – Diameter Runout, Major to Pitch Diameter, for External Thread |
| 58 | 4.6 Gages for Internal Threads |
| 59 | 17 Differential Gaging for External Thread |
| 60 | 18 Single-Thread, Full-Form Indicating Gages – Cone and Vee Helical Segments and Zero Lead Rolls for External Thread |
| 61 | 20 Not Go Setting Plug Gages for Working Adjustable Ring Gages for External Threads and Not Go Working Plug Gages for Internal Threads, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G,3G, and 4G |
| 64 | 21 Limiting Dimensions, Go and Not Go Working Adjustable Ring Gages for External Threads, General Purpose Single-Start Acme Screw Threads, Standard Series, Classes 2G,3G, and 4G |
| 66 | 19 Maximum-Material Go Functional Limit for Internal Thread |
| 67 | 20 Indicating Thread Gages – Maximum-Material Go Functional Size for Internal Thread |
| 68 | 21 Not Go Functional Diameter Limit for Internal Thread |
| 69 | 22 Indicating Thread Gages – Minimum-Material Pitch Diameter Limit and Size, Cone and Vee, for Internal Thread |
| 70 | 23 Indicating Thread Gages – Minimum-Material Thread Groove Diameter Limit and Size, Ball and Radius, for Internal Thread |
| 71 | 24 Thread Form of Solid Thread Setting Ring Gage for Internal Thread 25 Minor Diameter Limit – Cylindrical Plug Gages for Internal Thread |
| 72 | 22 Limiting Dimensions, Solid-Setting Thread Ring Gages for Internal Thread Indicating Gages, Single-Start Acme Screw Threads 23 Plain Gage Tolerances |
| 73 | 26 Indicating Thread Gages – Diameter Runout, Minor to Pitch Diameter, for Internal Thread |
| 74 | 27 Differential Gaging for Internal Thread |
| 75 | 28 Single-Thread, Full-Form Indicating Gages – Cone and Vee Helical Segments and Zero Lead Roils for Internal Thread |
| 76 | 4.7 ASME B47.1 Gage Blanks 5 Gaging for Centralizing Acme Threads 5.1 Gage Tolerances 5.2 Gages for External Centralizing Acme Thread |
| 77 | 29 Indicating Plain Diameter Gages – Maximum/Minimum Minor Diameter Limit and Size for Internal Thread |
| 78 | 30 Indicating Diameter Gages – Maximum/Minimum Major Diameter Limit and Size for Internal Thread |
| 79 | 24 Tolerances for Go and Not Go Thread Gages, Working and Setting, for Centralizing Single-Start Acme Screw Threads (0.250 in.Through 5.000 in.) |
| 80 | 25 Limiting Dimensions, Go and Not Go Setting Plug Gages for Adjustable Ring and Indicating Gages for External Thread, Centralizing Single-Start Acme Screw Threads, Standard Series, Classes 2C,3C, and 4C |
| 83 | 26 Limiting Dimensions, Go and Not Go Working Adjustable Ring Gages for External Thread, Centralizing Single-Start Acme Screw Threads, Standard Series, Classes 2C,3C, and 4C |
| 85 | 5.3 Gages for Internal Centralizing Acme Screw Threads |
| 86 | 27 Limiting Dimensions, Go and Not Go Working Plug Gages for Internal Thread, Centralizing Single-Start Acme Screw Threads, Standard Series, Classes 2C,3C, and 4C |
| 88 | 28 Limiting Dimensions, Not Go Thread Plug Gages for Major Diameter of Centralizing Single-Start Internal Acme Screw Threads, Standard Series, Classes 2C,3C, and 4C |
| 90 | 31 Not Go Thread Plug Gage for Major Diameter of Centralizing Internal Thread |
| 91 | A Acme Centralizing Threads Alternate Series With Minor Diameter Centralizing Control |
| 93 | B Multiple-Start Acme Threads |
| 97 | C General Purpose Acme Thread Class 5G |
| 101 | D Centralizing Acme Thread Classes 5C and 6C |
| 105 | E Three-Wire Method for Measurement of Pitch Diameter of 29 deg External Acme Threads |
| 115 | F Bali Method for Measurement of Internal Pitch Diameter of 29 deg Acme Screw Threads |
| 119 | G Go Gage Functional Size Compensation, Flank Angle Correction, Limit Gaging of Setting Ring, and Gaging Problem Areas |
| 123 | H Tolerances for Acme Screw Thread Gages Over 5.000 in |
| 125 | I Determining Limits of Size for Multiple-Start Diameter/Pitch Combinations |
