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1854 ANSI BUTTRESS THREADS Table 4. American National Standard Buttress Inch Screw Threads Tolerances Class 2 (Standard Grade) and Class 3 (Precision Grade) ANSI B1.9-1973 (R1992) Thds. per Inch Pitch, a p Inch From 0.5 thru 0.7 Machinery's Handbook 27th Edition Over 0.7 thru 1.0 Over 1.0 thru 1.5 Basic Major Diameter, Inch Over 1.5 thru 2.5 Over 2.5 thru 4 Pitchb Increment, 0.0173 p Inch angle for Class 3, shall not exceed 50 percent of the Class 2 pitch diameter tolerances given in Table 4. Tolerances on Taper and Roundness: There are no requirements for taper and roundness for Class 2 buttress screw threads. Over 4 thru 6 Over 6 thru 10 Over 10 thru 16 Over 16 thru 24 Tolerance on Major Diameter of External Thread, Pitch Diameter of External and Internal Threads, and Minor Diameter of Internal Thread, Inch Class 2, Standard Grade 20 0.0500 .0056 .... .... .... .... .... .... .... .... .00387 16 0.0625 .0060 .0062 .0065 .0068 .0073 .... .... .... .... .00432 12 0.0833 .0067 .0069 .0071 .0075 .0080 .0084 .... .... .... .00499 10 0.1000 .... .0074 .0076 .0080 .0084 .0089 .0095 .0102 .... .00547 8 0.1250 .... .... .0083 .0086 .0091 .0095 .0101 .0108 .0115 .00612 6 0.1667 .... .... .0092 .0096 .0100 .0105 .0111 .0118 .0125 .00706 5 0.2000 .... .... .... .0103 .0107 .0112 .0117 .0124 .0132 .00774 4 0.2500 .... .... .... .0112 .0116 .0121 .0127 .0134 .0141 .00865 3 0.3333 .... .... .... .... .... .0134 .0140 .0147 .0154 .00999 2.5 0.4000 .... .... .... .... .... .... .0149 .0156 .0164 .01094 2.0 0.5000 .... .... .... .... .... .... .0162 .0169 .0177 .01223 1.5 0.6667 .... .... .... .... .... .... .... .0188 .0196 .01413 1.25 0.8000 .... .... .... .... .... .... .... .0202 .0209 .01547 1.0 1.0000 .... .... .... .... .... .... .... .... .0227 .01730 Diameter Increment, c 0.002 3 D .00169 .00189 .00215 .00252 .00296 .00342 .00400 .00470 .00543 Class 3, Precision Grade 20 0.0500 .0037 .... .... .... .... .... .... .... .... 16 0.0625 .0040 .0042 .0043 .0046 .0049 .... .... .... .... 12 0.0833 .0044 .0046 .0048 .0050 .0053 .0056 .... .... .... 10 0.1000 .... .0049 .0051 .0053 .0056 .0059 .0063 .0068 .... 8 0.1250 .... .... .0055 .0058 .0061 .0064 .0067 .0072 .0077 6 0.1667 .... .... .0061 .0064 .0067 .0070 .0074 .0078 .0083 5 .02000 .... .... .... .0068 .0071 .0074 .0078 .0083 .0088 4 0.2500 .... .... .... .0074 .0077 .0080 .0084 .0089 .0094 3 .03333 .... .... .... .... .... .0089 .0093 .0098 .0103 2.5 0.4000 .... .... .... .... .... .... .0100 .0104 .0109 2.0 0.5000 .... .... .... .... .... .... .0108 .0113 .0118 1.5 0.6667 .... .... .... .... .... .... .... .0126 .0130 1.25 0.8000 .... .... .... .... .... .... .... .0135 .0139 1.0 1.0000 .... .... .... .... .... .... .... .... .0152 a For threads with pitches not shown in this table, pitch increment to be used in tolerance formula is to be determined by use of formula PD Tolerance = 0.002 3 D + 0.00278 Le + 0.00854 p , where: D = basic major diameter of external thread (assuming no allowance), Le = length of engagement, and p = pitch of thread. This formula relates specifically to Class 2 (standard grade) PD tolerances. Class 3 (precision grade) PD tolerances are two-thirds of Class 2 PD tolerances. See text b When the length of engagement is taken as 10p, the formula reduces to: 0.002 3 D + 0.0173 c Diameter D, used in diameter increment formula, is based on the average of the range. p Copyright 2004, Industrial Press, Inc., New York, NY
ANSI BUTTRESS THREADS 1855 The major and minor diameters of Class 3 buttress threads shall not taper nor be out of round to the extent that specified limits for major and minor diameter are exceeded. The taper and out-of-roundness of the pitch diameter for Class 3 buttress threads shall not exceed 50 per cent of the pitch-diameter tolerances. Allowances for Easy Assembly.—An allowance (clearance) should be provided on all external threads to secure easy assembly of parts. The amount of the allowance is deducted from the nominal major, pitch, and minor diameters of the external thread when the maximum material condition of the external thread is to be determined. The minimum internal thread is basic. The amount of the allowance is the same for both classes and is equal to the Class 3 pitchdiameter tolerance as calculated by the formulas previously given. The allowances for various diameter-pitch combinations are given in Table 5. Table 5. American National Standard External Thread Allowances for Classes 2 and 3 Buttress Inch Screw Threads ANSI B1.9-1973 (R1992) Threads per Inch Pitch, p Inch From 0.5 thru 0.7 Machinery's Handbook 27th Edition Over 0.7 thru 1.0 Over 1.0 thru 1.5 Basic Major Diameter, Inch Over 1.5 thru 2.5 Allowance on Major, Minor and Pitch Diameters of External Thread, Inch 20 0.0500 .0037 .... .... .... .... .... .... .... .... 16 0.0625 .0040 .0042 .0043 .0046 .0049 .... .... .... .... 12 0.0833 .0044 .0046 .0048 .0050 .0053 .0056 .... .... .... 10 0.1000 .... .0049 .0051 .0053 .0056 .0059 .0063 .0068 .... 8 0.1250 .... .... .0055 .0058 .0061 .0064 .0067 .0072 .0077 6 0.1667 .... .... .0061 .0064 .0067 .0070 .0074 .0078 .0083 5 0.2000 .... .... .... .0068 .0071 .0074 .0078 .0083 .0088 4 0.2500 .... .... .... .0074 .0077 .0080 .0084 .0089 .0094 3 0.3333 .... .... .... .... .... .0089 .0093 .0098 .0103 2.5 0.4000 .... .... .... .... .... .... .0100 .0104 .0109 2.0 0.5000 .... .... .... .... .... .... .0108 .0113 .0118 1.5 0.6667 .... .... .... .... .... .... .... .0126 .0130 1.25 0.8000 .... .... .... .... .... .... .... .0135 .0139 1.0 1.0000 .... .... .... .... .... .... .... .... .0152 Example Showing Dimensions for a Typical Buttress Thread.—The dimensions for a 2-inch diameter, 4 threads per inch, Class 2 buttress thread with flank angles of 7 degrees and 45 degrees are h=basic thread height = 0.1500 (Table 2) h s = h n = height of thread in external and internal threads = 0.1657 (Table 2) G=pitch-diameter allowance on external thread = 0.0074 (Table 5) Tolerance on PD of external and internal threads = 0.0112 (Table 4) Tolerance on major diameter of external thread and minor diameter of internal thread = 0.0112 (Table 4) Internal Thread: Basic Major Diameter: D = 2.0000 Min. Major Diameter: D − 2h + 2h n = 2.0314 (see Table 2) Min. Pitch Diameter: D − h = 1.8500 (see Table 2) Max. Pitch Diameter: D − h + PD Tolerance = 1.8612 (see Table 4) Min. Minor Diameter: D − 2h = 1.7000 (see Table 2) Max. Minor Diameter: D − 2h + Minor Diameter Tolerance = 1.7112 (see Table 4) Over 2.5 thru 4 Over 4 thru 6 Over 6 thru 10 Copyright 2004, Industrial Press, Inc., New York, NY Over 10 thru 16 Over 16 thru 24
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SCREW THREAD SYSTEMS 1725 Screw Thr
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