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Machinery's Handbook 27th Edition Table 12. American National Standard Centralizing Acme Single-Start Screw Threads — Tolerances and Allowances for Major and Minor Diameters ASME/ANSI B1.5-1988 Thds Size (Nom.) a Allowance From Basic Major and Minor Diameters (All Classes) Tolerance on Major Diameter Plus on Internal, Minus on External Threads Tolerance Minor Diam, on Minor Diam, b, c All Internal per Inch Threads, (Plus 0.05P) d Internal Thread Class 2C Class 3C Class 4C All External Major Diam, Threads (Minus) e (Plus Minor Diam, d External and Internal Threads, External Thread, Internal Thread, External Thread, Internal Thread, (Plus 0.1P) 1 ⁄4 16 0.010 0.0005 0.0062 0.0050 0.0017 0.0007 0.0017 0.0005 0.0010 5 ⁄16 14 0.010 0.0006 0.0071 0.0050 0.0020 0.0008 0.0020 0.0006 0.0011 3 ⁄8 12 0.010 0.0006 0.0083 0.0050 0.0021 0.0009 0.0021 0.0006 0.0012 7 ⁄16 12 0.010 0.0007 0.0083 0.0050 0.0023 0.0010 0.0023 0.0007 0.0013 1 ⁄2 10 0.020 0.0007 0.0100 0.0050 0.0025 0.0011 0.0025 0.0007 0.0014 5 ⁄8 8 0.020 0.0008 0.0125 0.0062 0.0028 0.0012 0.0028 0.0008 0.0016 3 ⁄4 6 0.020 0.0009 0.0167 0.0083 0.0030 0.0013 0.0030 0.0009 0.0017 7 ⁄8 6 0.020 0.0009 0.0167 0.0083 0.0033 0.0014 0.0033 0.0009 0.0019 1 5 0.020 0.0010 0.0200 0.0100 0.0035 0.0015 0.0035 0.0010 0.0020 11 ⁄ 8 5 0.020 0.0011 0.0200 0.0100 0.0037 0.0016 0.0037 0.0011 0.0021 11 ⁄ 4 5 0.020 0.0011 0.0200 0.0100 0.0039 0.0017 0.0039 0.0011 0.0022 13 ⁄ 8 4 0.020 0.0012 0.0250 0.0125 0.0041 0.0018 0.0041 0.0012 0.0023 11 ⁄ 2 4 0.020 0.0012 0.0250 0.0125 0.0043 0.0018 0.0043 0.0012 0.0024 13 ⁄ 4 4 0.020 0.0013 0.0250 0.0125 0.0046 0.0020 0.0046 0.0013 0.0026 2 4 0.020 0.0014 0.0250 0.0125 0.0049 0.0021 0.0049 0.0014 0.0028 21 ⁄ 4 3 0.020 0.0015 0.0333 0.0167 0.0052 0.0022 0.0052 0.0015 0.0030 21 ⁄ 2 3 0.020 0.0016 0.0333 0.0167 0.0055 0.0024 0.0055 0.0016 0.0032 23 ⁄ 4 3 0.020 0.0017 0.0333 0.0167 0.0058 0.0025 0.0058 0.0017 0.0033 3 2 0.020 0.0017 0.0500 0.0250 0.0061 0.0026 0.0061 0.0017 0.0035 31 ⁄ 2 2 0.020 0.0019 0.0500 0.0250 0.0065 0.0028 0.0065 0.0019 0.0037 4 2 0.020 0.0020 0.0500 0.0250 0.0070 0.0030 0.0070 0.0020 0.0040 41 0.0010 D ) 0.0035 D 0.0015 D 0.0035 D 0.0010 D 0.0020 D ⁄ 2 2 0.020 0.0021 0.0500 0.0250 0.0074 0.0032 0.0074 0.0021 0.0042 5 2 0.020 0.0022 0.0500 0.0250 0.0078 0.0034 0.0078 0.0022 0.0045 a All other dimensions are given in inches. Intermediate pitches take the values of the next coarser pitch listed. Values for intermediate diameters should be calculated from the formulas in column headings, but ordinarily may be interpolated. b To avoid a complicated formula and still provide an adequate tolerance, the pitch factor is used as a basis, with the minimum tolerance set at 0.005 in. c Tolerance on minor diameter of all external threads is 1.5 × pitch diameter tolerance. d The minimum clearance at the minor diameter between the internal and external thread is the sum of the values in columns 3 and 5. e The minimum clearance at the major diameter between the internal and external thread is equal to column 4. Copyright 2004, Industrial Press, Inc., New York, NY 1842 CENTRALIZING ACME SCREW THREADS
Machinery's Handbook 27th Edition STUB ACME SCREW THREADS 1843 Designation of Centralizing Acme Threads.—The following examples are given to show how these Acme threads are designated on drawings, in specifications, and on tools and gages: Example, 1.750-6-ACME-4C:Indicates a Centralizing Class 4C Acme thread of 1.750inch major diameter, 0.1667-inch pitch, single thread, right-hand. Example, 1.750-6-ACME-4C-LH:Indicates the same thread left-hand. Example, 2.875-0.4P-0.8L-ACME-3C (Two Start):Indicates a Centralizing Class 3C Acme thread with 2.875-inch major diameter, 0.4-inch pitch, 0.8-inch lead, double thread, right-hand. Example, 2.500-0.3333P-0.6667L-ACME-4C (Two Start):Indicates a Centralizing Class 4C Acme thread with 2.500-inch nominal major diameter (basic major diameter 2.500 inches), 0.3333-inch pitch, 0.6667-inch lead, double thread, right-hand. The same thread left-hand would have LH at the end of the designation. Acme Centralizing Threads—Alternative Series with Minor Diameter Centralizing Control.—When Acme centralizing threads are produced in single units or in very small quantities (and principally in sizes larger than the range of commercial taps and dies) where the manufacturing process employs cutting tools (such as lathe cutting), it may be economically advantageous and therefore desirable to have the centralizing control of the mating threads located at the minor diameters. Particularly under the above-mentioned type of manufacturing, the two advantages cited for minor diameter centralizing control over centralizing control at the major diameters of the mating threads are: 1) Greater ease and faster checking of machined thread dimensions. It is much easier to measure the minor diameter (root) of the external thread and the mating minor diameter (crest or bore) of the internal thread than it is to determine the major diameter (root) of the internal thread and the major diameter (crest or turn) of the external thread; and 2) better manufacturing control of the machined size due to greater ease of checking. In the event that minor diameter centralizing is necessary, recalculate all thread dimensions, reversing major and minor diameter allowances, tolerances, radii, and chamfer. American National Standard Stub Acme Threads.—This American National Standard ASME/ANSI B1.8-1988 (R2001) provides a Stub Acme screw thread for those unusual applications where, due to mechanical or metallurgical considerations, a coarsepitch thread of shallow depth is required. The fit of Stub Acme threads corresponds to the Class 2G General Purpose Acme thread in American National Standard ANSI B1.5-1988. For a fit having less backlash, the tolerances and allowances for Classes 3G or 4G General Purpose Acme threads may be used. Thread Form: The thread form and basic formulas for Stub Acme threads are given on page 1826 and the basic dimensions in Table 13. Allowances and Tolerances: The major and minor diameter allowances for Stub Acme threads are the same as those given for General Purpose Acme threads on page 1825. Pitch diameter allowances for Stub Acme threads are the same as for Class 2G General Purpose Acme threads and are given in Table 4. Pitch diameter tolerances for Stub Acme threads are the same as for Class 2G General Purpose Acme threads given in Table 5. Limiting Dimensions: Limiting dimensions of American Standard Stub Acme threads may be determined by using the formulas given in Table 14a, or directly from Table 14b. The diagram below shows the limits of size for Stub Acme threads. Thread Series: A preferred series of diameters and pitches for General Purpose Acme threads (Table 15) is recommended for Stub Acme threads. Copyright 2004, Industrial Press, Inc., New York, NY
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