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Machinery's Handbook 27th Edition 1790 METRIC SCREW THREADS M PROFILE Fig. 5. Metric Tolerance System for Screw Threads Tolerance: The tolerance is defined by a series of numerical grades. Each grade provides numerical values for the various nominal sizes corresponding to the standard tolerance for that grade. In the schematic diagram the tolerance for the external thread is shown as negative. Thus the tolerance plus the fit define the lower deviation (ei). The tolerance for the mating internal thread is shown as positive. Thus the tolerance plus the fit defines the upper deviation (ES). Tolerance Grade: This is indicated by a number. The system provides for a series of tolerance grades for each of the four screw thread parameters: minor diameter, internal thread, D 1 ; major diameter, external thread, d; pitch diameter, internal thread, D 2 ; and pitch diameter, external thread, d 2. The tolerance grades for this Standard ANSI B1.13M were selected from those given in ISO 965/1. Dimension Tolerance Grades Table D 1 4, 5, 6, 7, 8 Table 8 d 4, 6, 8 Table 9 D 2 4, 5, 6, 7, 8 Table 10 d 2 3, 4, 5, 6, 7, 8, 9 Table 11 Note: The underlined tolerance grades are used with normal length of thread engagement. Tolerance Position: This position is the allowance (fundamental deviation) and is indicated by a letter. A capital letter is used for internal threads and a lower case letter for external threads. The system provides a series of tolerance positions for internal and external threads. The underlined letters are used in this Standard: Internal threads G, H Table 6 External threads e, f, g, h Table 6 Designations of Tolerance Grade, Tolerance Position, and Tolerance Class: The tolerance grade is given first followed by the tolerance position, thus: 4g or 5H. To designate the tolerance class the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H. Copyright 2004, Industrial Press, Inc., New York, NY
METRIC SCREW THREADS M PROFILE 1791 Table 6. American National Standard Allowance (Fundamental Deviation) for Internal and External Metric Threads ISO 965/1 ANSI/ASME B1.13M-1983 (R1995) Pitch P Internal Thread D 2 , D 1 Allowance (Fundamental Deviation) a External Thread d, d 2 G H e f g h EI EI es es es es 0.2 +0.017 0 … … −0.017 0 0.25 +0.018 0 … … −0.018 0 0.3 +0.018 0 … … −0.018 0 0.35 +0.019 0 … −0.034 −0.019 0 0.4 +0.019 0 … −0.034 −0.019 0 0.45 +0.020 0 … −0.035 −0.020 0 0.5 +0.020 0 −0.050 −0.036 −0.020 0 0.6 +0.021 0 −0.053 −0.036 −0.021 0 0.7 +0.022 0 −0.056 −0.038 −0.022 0 0.75 +0.022 0 −0.056 −0.038 −0.022 0 0.8 +0.024 0 −0.060 −0.038 −0.024 0 1 +0.026 0 −0.060 −0.040 −0.026 0 1.25 +0.028 0 −0.063 −0.042 −0.028 0 1.5 +0.032 0 −0.067 −0.045 −0.032 0 1.75 +0.034 0 −0.071 −0.048 −0.034 0 2 +0.038 0 −0.071 −0.052 −0.038 0 2.5 +0.042 0 −0.080 −0.058 −0.042 0 3 +0.048 0 −0.085 −0.063 −0.048 0 3.5 +0.053 0 −0.090 −0.070 −0.053 0 4 +0.060 0 −0.095 −0.075 −0.060 0 4.5 +0.063 0 −0.100 −0.080 −0.063 0 5 +0.071 0 −0.106 −0.085 −0.071 0 5.5 +0.075 0 −0.112 −0.090 −0.075 0 6 +0.080 0 −0.118 −0.095 −0.080 0 All dimensions are in millimeters. Machinery's Handbook 27th Edition a Allowance is the absolute value of fundamental deviation. Lead and Flank Angle Tolerances: For acceptance of lead and flank angles of product screw threads, see Section 10 of ANSI/ASME B1.13M-1983 (R1995). Short and Long Lengths of Thread Engagement when Gaged with Normal Length Contacts: For short lengths of thread engagement, LE, reduce the pitch diameter tolerance of the external thread by one tolerance grade number. For long lengths of thread engagement, LE, increase the allowance (fundamental deviation) at the pitch diameter of the external thread. Examples of tolerance classes required for normal, short, and long gage length contacts are given in the following table. Normal LE Short LE Long LE 6g 5g6g 6e6g 4g6g 3g6g 4e6g 6ha 5h6h 6g6h 4h6ha 3h6h 4g6h a Applies to maximum material functional size (GO thread gage) for plated 6g and 4g6g class threads, respectively. For lengths of thread engagement classified as normal, short, and long, see Table 7. Coated or Plated Threads: Coating is one or more applications of additive material to the threads, including dry-film lubricants, but excluding soft or liquid lubricants that are readily displaced in assembly or gaging. Plating is included as coating in the Standard. Copyright 2004, Industrial Press, Inc., New York, NY
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