Machinery's Handbook, 31st Edition
648 LIMITS AND FITS Table 4. Preferred Basic Sizes ANSI/ASME B4.1-1967 (2009; out of print) Decimal a Fractional a 0.010 2.00 8.50 1 ⁄ 64 0.015625 2 1 ⁄ 4 2.2500 9 1 ⁄ 2 9.5000 0.012 2.20 9.00 1 ⁄ 32 0.03125 2 1 ⁄ 2 2.5000 10 10.0000 0.016 2.40 9.50 1 ⁄ 16 0.0625 2 3 ⁄ 4 2.7500 10 1 ⁄ 2 10.5000 0.020 2.60 10.00 3 ⁄ 32 0.09375 3 3.0000 11 11.0000 0.025 2.80 10.50 1 ⁄ 8 0.1250 3 1 ⁄ 4 3.2500 11 1 ⁄ 2 11.5000 0.032 3.00 11.00 5 ⁄ 32 0.15625 3 1 ⁄ 2 3.5000 12 12.0000 0.040 3.20 11.50 3 ⁄ 16 0.1875 3 3 ⁄ 4 3.7500 12 1 ⁄ 2 12.5000 0.05 3.40 12.00 1 ⁄ 4 0.2500 4 4.0000 13 13.0000 0.06 3.60 12.50 5 ⁄ 16 0.3125 4 1 ⁄ 4 4.2500 13 1 ⁄ 2 13.5000 0.08 3.80 13.00 3 ⁄ 8 0.3750 4 1 ⁄ 2 4.5000 14 14.0000 0.10 4.00 13.50 7 ⁄ 16 0.4375 4 3 ⁄ 4 4.7500 14 1 ⁄ 2 14.5000 0.12 4.20 14.00 1 ⁄ 2 0.5000 5 5.0000 15 15.0000 0.16 4.40 14.50 9 ⁄ 16 0.5625 5 1 ⁄ 4 5.2500 15 1 ⁄ 2 15.5000 0.20 4.60 15.00 5 ⁄ 8 0.6250 5 1 ⁄ 2 5.5000 16 16.0000 0.24 4.80 15.50 11 ⁄ 16 0.6875 5 3 ⁄ 4 5.7500 16 1 ⁄ 2 16.5000 0.30 5.00 16.00 3 ⁄ 4 0.7500 6 6.0000 17 17.0000 0.40 5.20 16.50 7 ⁄ 8 0.8750 6 1 ⁄ 2 6.5000 17 1 ⁄ 2 17.5000 0.50 5.40 17.00 1 1.0000 7 7.0000 18 18.0000 0.60 5.60 17.50 1 1 ⁄ 4 1.2500 7 1 ⁄ 2 7.5000 18 1 ⁄ 2 18.5000 0.80 5.80 18.00 1 1 ⁄ 2 1.5000 8 8.0000 19 19.0000 1.00 6.00 18.50 1 3 ⁄ 4 1.7500 8 1 ⁄ 2 8.5000 19 1 ⁄ 2 19.5000 1.20 6.50 19.00 2 2.0000 9 9.0000 20 20.0000 1.40 7.00 19.50 … … … … … … 1.60 7.50 20.00 … … … … … … 1.80 8.00 … … … … … … … a All dimensions are in inches. Table 5. Preferred Series of Tolerances and Allowances a ANSI/ASME B4.1-1967 (2009; out of print) 0.1 1 10 100 0.3 3 30 … … 1.2 12 125 … 3.5 35 … 0.15 1.4 14 … 0.4 4 40 … … 1.6 16 160 … 4.5 45 … … 1.8 18 … 0.5 5 50 … 0.2 2 20 200 0.6 6 60 … … 2.2 22 … 0.7 7 70 … 0.25 2.5 25 250 0.8 8 80 … … 2.8 28 … 0.9 9 … … a All values in thousandths of an inch. ANSI/ASME Standard Fits.— Table 8a through Table 12 inclusive show a series of stan- dard types and classes of fits on a unilateral hole basis, such that the fit produced by mating parts in any one class will produce approximately similar performance throughout the range of sizes. These tables prescribe the fit for any given size, or type of fit; they also pre - scribe the standard limits for the mating parts that will produce the fit. The fits listed in these tables contain all those that appear in the approved American-British-Canadian proposal. Selection of Fits: In selecting limits of size for any application, the type of fit is determined first, based on the use or service required from the equipment being designed; then the limits of size of the mating parts are established, to insure that the desired fit will be produced. Theoretically, an infinite number of fits could be chosen, but the number of standard fits shown in the accompanying tables should cover most applications. Designation of Standard Fits: Standard fits are designated by means of the following symbols which, facilitate reference to classes of fit for educational purposes. The symbols are not intended to be shown on manufacturing drawings; instead, sizes should be speci fied on drawings.
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