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;; ;;;; ;;;;;; ;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;; ;;;;;; ;;;; ;; 1846 ALTERNATIVE CENTRALIZING ACME SCREW THREADS One-half major dia. allowance Internal Thread (Nut) Basic thickness of thread, P/2 ;;;;;;; ;;;;;;; ;;;;;;; ;;;;; ;;;;; ;;;;;; ;;;;;; 0.15P Machinery's Handbook 27th Edition Max major dia. of nut Min major dia. of nut Nominal (basic) major dia. (D) Max major dia. of screw Min major dia. of screw Min depth of engagement h Max pitch dia. of screw Min pitch dia. of screw Basic pitch dia. 1/2 Pitch dia. allowance Max minor dia. of nut Min minor dia. of nut Basic minor dia. Max minor dia. of screw Min minor dia. of screw P′ ;;;;;; External Thread (Screw) Min minor dia. of screw Min pitch dia. of nut Limits of Size, Allowances, Tolerances, and Crest Clearances for American National Standard Stub Acme Threads One-half major dia. allowance Stub Acme Thread Designations.—The method of designation for Standard Stub Acme threads is illustrated in the following examples: 0.500-20 Stub Acme indicates a 1 ⁄ 2-inch major diameter, 20 threads per inch, right hand, single thread, Standard Stub Acme thread. The designation 0.500-20 Stub Acme-LH indicates the same thread except that it is left hand. Alternative Stub Acme Threads.—Since one Stub Acme thread form may not meet the requirements of all applications, basic data for two of the other commonly used forms are included in the appendix of the American Standard for Stub Acme Threads. These socalled Modified Form 1 and Modified Form 2 threads utilize the same tolerances and allowances as Standard Stub Acme threads and have the same major diameter and basic thread thickness at the pitchline (0.5P). The basic height of Form 1 threads, h, is 0.375P; for Form 2 it is 0.250P. The basic width of flat at the crest of the internal thread is 0.4030P for Form 1 and 0.4353P for Form 2. The pitch diameter and minor diameter for Form 1 threads will be smaller than similar values for the Standard Stub Acme Form and for Form 2 they will be larger owing to the differences in basic thread height h. Therefore, in calculating the dimensions of Form 1 and Form 2 threads using Formulas 1 through 12 in Table 14a, it is only necessary to substitute the following values in applying the formulas: For Form 1, D 2 = D − 0.375P, D 1 = D − 0.75P; for Form 2, D 2 = D − 0.25P, D 1 = D − 0.5P. Thread Designation: These threads are designated in the same manner as Standard Stub Acme threads except for the insertion of either M1 or M2 after “Acme.” Thus, 0.500-20 Stub Acme M1 for a Form 1 thread; and 0.500-20 Stub Acme M2 for a Form 2 thread. Former 60-Degree Stub Thread.—Former American Standard B1.3-1941 included a 60-degree stub thread for use where design or operating conditions could be better satisfied by the use of this thread, or other modified threads, than by Acme threads. Data for 60- Degree Stub thread form are given in the accompanying diagram. Copyright 2004, Industrial Press, Inc., New York, NY 0.15P
Nominal Sizes Table 15. Stub Acme Screw Thread Data ASME/ANSI B1.8-1988 (R2001) Identification Basic Diameters Thread Data Threads per Inch, a n Major Diameter, D Pitch Diameter, D 2 = D − h Machinery's Handbook 27th Edition Minor Diameter, D 1 = D − 2h Pitch, P Thread Thickness at Pitch Line, t = P/2 Basic Thread Height, h = 0.3P Basic Width of Flat, 0.4224P Lead Angleat Basic Pitch Diameter Deg Min 1 ⁄4 16 0.2500 0.2312 0.2125 0.06250 0.03125 0.01875 0.0264 4 54 5 ⁄16 14 0.3125 0.2911 0.2696 0.07143 0.03572 0.02143 0.0302 4 28 3 ⁄8 12 0.3750 0.3500 0.3250 0.08333 0.04167 0.02500 0.0352 4 20 7 ⁄16 12 0.4375 0.4125 0.3875 0.08333 0.04167 0.02500 0.0352 3 41 1 ⁄2 10 0.5000 0.4700 0.4400 0.10000 0.05000 0.03000 0.0422 3 52 5 ⁄8 8 0.6250 0.5875 0.5500 0.12500 0.06250 0.03750 0.0528 3 52 3 ⁄4 6 0.7500 0.7000 0.6500 0.16667 0.08333 0.05000 0.0704 4 20 7 ⁄8 6 0.8750 0.8250 0.7750 0.16667 0.08333 0.05000 0.0704 3 41 1 5 1.0000 0.9400 0.8800 0.20000 0.10000 0.06000 0.0845 3 52 11 ⁄ 8 5 1.1250 1.0650 1.0050 0.20000 0.10000 0.06000 0.0845 3 25 11 ⁄ 4 5 1.2500 1.1900 1.1300 0.20000 0.10000 0.06000 0.0845 3 4 13 ⁄ 8 4 1.3750 1.3000 1.2250 0.25000 0.12500 0.07500 0.1056 3 30 11 ⁄ 2 4 1.5000 1.4250 1.3500 0.25000 0.12500 0.07500 0.1056 3 12 13 ⁄ 4 4 1.7500 1.6750 1.6000 0.25000 0.12500 0.07500 0.1056 2 43 2 4 2.0000 1.9250 1.8500 0.25000 0.12500 0.07500 0.1056 2 22 21 ⁄ 4 3 2.2500 2.1500 2.0500 0.33333 0.16667 0.10000 0.1408 2 50 21 ⁄ 2 3 2.5000 2.4000 2.3000 0.33333 0.16667 0.10000 0.1408 2 32 23 ⁄ 4 3 2.7500 2.6500 2.5500 0.33333 0.16667 0.10000 0.1408 2 18 3 2 3.0000 2.8500 2.7000 0.50000 0.25000 0.15000 0.2112 3 12 31 ⁄ 2 2 3.5000 3.3500 3.2000 0.50000 0.25000 0.15000 0.2112 2 43 4 2 4.0000 3.8500 3.7000 0.50000 0.25000 0.15000 0.2112 2 22 41 ⁄ 2 2 4.5000 4.3500 4.2000 0.50000 0.25000 0.15000 0.2112 2 6 5 2 5.0000 4.8500 4.7000 0.50000 0.25000 0.15000 0.2112 1 53 a All other dimensions are given in inches. Copyright 2004, Industrial Press, Inc., New York, NY ALTERNATIVE CENTRALIZING ACME SCREW 1847
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SCREW THREAD SYSTEMS 1725 Screw Thr
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METRIC SCREW THREADS M PROFILE 1787
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