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Comparison of Various Metric Thread Systems Metric Series Threads — A comparison of Maximum Metal Dimensions of British ( BS 1095), French ( NF E03-104), German ( DIN 13), and Swiss ( VSM 12003) Systems Nominal Size and Major Bolt Diam. Pitch All dimensions are in mm. Pitch Diam. Machinery's Handbook 27th Edition Bolt Nut Minor Diameter Major Diameter Minor Diameter British French German Swiss British & German French Swiss French, German& Swiss British 6 1 5.350 4.863 4.59 4.700 4.60 6.000 6.108 6.100 4.700 4.863 7 1 6.350 5.863 5.59 5.700 5.60 7.000 7.108 7.100 5.700 5.863 8 1.25 7.188 6.579 6.24 6.376 6.25 8.000 8.135 8.124 6.376 6.579 9 1.25 8.188 7.579 7.24 7.376 7.25 9.000 9.135 9.124 7.376 7.579 10 1.5 9.026 8.295 7.89 8.052 7.90 10.000 10.162 10.150 8.052 8.295 11 1.5 10.026 9.295 8.89 9.052 8.90 11.000 11.162 11.150 9.052 9.295 12 1.75 10.863 10.011 9.54 9.726 9.55 12.000 12.189 12.174 9.726 10.011 14 2 12.701 11.727 11.19 11.402 11.20 14.000 14.216 14.200 11.402 11.727 16 2 14.701 13.727 13.19 13.402 13.20 16.000 16.216 16.200 13.402 13.727 18 2.5 16.376 15.158 14.48 14.752 14.50 18.000 18.270 18.250 14.752 15.158 20 2.5 18.376 17.158 16.48 16.752 16.50 20.000 20.270 20.250 16.752 17.158 22 2.5 20.376 19.158 18.48 18.752 18.50 22.000 22.270 22.250 18.752 19.158 24 3 22.051 20.590 19.78 20.102 19.80 24.000 24.324 24.300 20.102a 20.590 27 3 25.051 23.590 22.78 23.102 22.80 27.000 27.324 27.300 23.102 a The value shown is given in the German Standard; the value in the French Standard is 20.002; and in the Swiss Standard, 20.104. b 23.590 30 3.5 27.727 26.022 25.08 25.454 25.10 30.000 30.378 30.350 25.454 26.022 33 3.5 30.727 29.022 28.08 28.454 28.10 33.000 33.378 33.350 28.454 29.022 36 4 33.402 31.453 30.37 30.804 30.40 36.000 36.432 36.400 30.804 31.453 39 4 36.402 34.453 33.37 33.804 33.40 39.000 39.432 39.400 33.804 34.453 42 4.5 39.077 36.885 35.67 36.154 35.70 42.000 42.486 42.450 36.154 36.885 45 4.5 42.077 39.885 38.67 39.154 38.70 45.000 45.486 45.450 39.154 39.885 48 5 41.752 42.316 40.96 41.504 41.00 48.000 48.540 48.500 41.504 42.316 52 5 48.752 46.316 44.96 45.504 45.00 52.000 52.540 52.500 45.504 46.316 56 5.5 52.428 49.748 48.26 48.856 48.30 56.000 56.594 56.550 48.856 49.748 60 5.5 56.428 53.748 52.26 52.856 52.30 60.000 60.594 60.550 52.856 53.748 b The value shown is given in the German Standard; the value in the French Standard is 23.002; and in the Swiss Standard, 23.104. Copyright 2004, Industrial Press, Inc., New York, NY 1824 COMPARISON OF METRIC THREAD SYSTEMS
Machinery's Handbook 27th Edition ACME SCREW THREADS 1825 ACME SCREW THREADS American National Standard Acme Screw Threads This American National Standard ASME/ANSI B1.5-1997 is a revision of American Standard ANSI B1.5-1988 and 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 multi-start Acme threads, which provide fast relative traversing motion when this is necessary. For information on additional allowances for multistart Acme threads, see later section on page 1827. General Purpose Acme Threads.—Three classes of General Purpose threads, 2G, 3G, and 4G, are provided in the standard, each having clearance on all diameters for free movement, and may be used in assemblies with the internal thread rigidly fixed and movement of the external thread in a direction perpendicular to its axis limited by its bearing or bearings. It is suggested that external and internal threads of the same class be used together for general purpose assemblies, Class 2G being the preferred choice. If less backlash or end play is desired, Classes 3G and 4G are provided. Class 5G is not recommended for new designs. Thread Form: The accompanying Fig. 1 shows the thread form of these General Purpose threads, and the formulas accompanying the figure determine their basic dimensions. Table 1 gives the basic dimensions for the most generally used pitches. Angle of Thread: The angle between the sides of the thread, measured in an axial plane, is 29 degrees. The line bisecting this 29-degree angle shall be perpendicular to the axis of the screw thread. Thread Series: A series of diameters and associated pitches is recommended in the Standard as preferred. These diameters and pitches have been chosen to meet present needs with the fewest number of items in order to reduce to a minimum the inventory of both tools and gages. This series of diameters and associated pitches is given in Table 3. Chamfers and Fillets: General Purpose external threads may have the crest corner chamfered to an angle of 45 degrees with the axis to a maximum width of P/15, where P is the pitch. This corresponds to a maximum depth of chamfer fiat of 0.0945P. Basic Diameters: The max major diameter of the external thread is basic and is the nominal major diameter for all classes. The min pitch diameter of the internal thread is basic and is equal to the basic major diameter minus the basic height of the thread, h. The basic minor diameter is the min minor diameter of the internal thread. It is equal to the basic major diameter minus twice the basic thread height, 2h. Length of Engagement: The tolerances specified in this standard are applicable to lengths of engagement not exceeding twice the nominal major diameter. Major and Minor Diameter Allowances: A minimum diametral clearance is provided at the minor diameter of all external threads by establishing the maximum minor diameter 0.020 inch below the basic minor diameter of the nut for pitches of 10 threads per inch and coarser, and 0.10 inch for finer pitches. A minimum diametral clearance at the major diameter is obtained by establishing the minimum major diameter of the internal thread 0.020 inch above the basic major diameter of the screw for pitches of 10 threads per inch and coarser, and 0.010 inch for finer pitches. Major and Minor Diameter Tolerances: The tolerance on the external thread major diameter is 0.05P, where P is the pitch, with a minimum of 0.005 inch. The tolerance on the internal thread major diameter is 0.020 inch for 10 threads per inch and coarser and 0.010 for finer pitches. The tolerance on the external thread minor diameter is 1.5 × pitch diameter tolerance. The tolerance on the internal thread minor diameter is 0.05P with a minimum of 0.005 inch. Copyright 2004, Industrial Press, Inc., New York, NY
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