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Machinery's Handbook 27th Edition 1784 METRIC SCREW THREADS M PROFILE Fit: The relationship existing between two corresponding external and internal threads with respect to the amount of clearance or interference which is present when they are assembled. Fundamental Deviation: For Standard threads, the deviation (upper or lower) closer to the basic size. It is the upper deviation, es, for an external thread and the lower deviation, EI, for an internal thread. (See Fig. 5.) Limiting Profiles: The limiting M profile for internal threads is shown in Fig. 6. The limiting M profile for external threads is shown in Fig. 7. Lower Deviation: The algebraic difference between the minimum limit of size and the corresponding basic size. Nut Thread (Internal Thread): A term used in ISO metric thread standards to describe all internal threads. All symbols associated with internal threads are designated with upper case letters. This Standard uses the term internal thread in accordance with United States practice. Tolerance: The total amount of variation permitted for the size of a dimension. It is the difference between the maximum limit of size and the minimum limit of size (i.e., the algebraic difference between the upper deviation and the lower deviation). The tolerance is an absolute value without sign. Tolerance for threads is applied to the design size in the direction of the minimum material. On external threads the tolerance is applied negatively. On internal threads the tolerance is applied positively. Tolerance Class: The combination of a tolerance position with a tolerance grade. It specifies the allowance (fundamental deviation) and tolerance for the pitch and major diameters of external threads and pitch and minor diameters of internal threads. Tolerance Grade: A numerical symbol that designates the tolerances of crest diameters and pitch diameters applied to the design profiles. Tolerance Position: A letter symbol that designates the position of the tolerance zone in relation to the basic size. This position provides the allowance (fundamental deviation). Upper Deviation: The algebraic difference between the maximum limit of size and the corresponding basic size. Basic M Profile.—The basic M thread profile also known as ISO 68 basic profile for metric screw threads is shown in Fig. 1 with associated dimensions listed in Table 3. Design M Profile for Internal Thread.—The design M profile for the internal thread at maximum material condition is the basic ISO 68 profile. It is shown in Fig. 2 with associated thread data listed in Table 3. Design M Profile for External Thread.—The design M profile for the external thread at the no allowance maximum material condition is the basic ISO 68 profile except where a rounded root is required. For the standard 0.125P minimum radius, the ISO 68 profile is modified at the root with a 0.17783H truncation blending into two arcs with radii of 0.125P tangent to the thread flanks as shown in Fig. 3 with associated thread data in Table 3. M Crest and Root Form.—The form of crest at the major diameter of the external thread is flat, permitting corner rounding. The external thread is truncated 0.125H from a sharp crest. The form of the crest at the minor diameter of the internal thread is flat. It is truncated 0.25H from a sharp crest. The crest and root tolerance zones at the major and minor diameters will permit rounded crest and root forms in both external and internal threads. The root profile of the external thread must lie within the “section lined” tolerance zone shown in Fig. 4. For the rounded root thread, the root profile must lie within the “section lined” rounded root tolerance zone shown in Fig. 4. The profile must be a continuous, smoothly blended non-reversing curve, no part of which has a radius of less than 0.125P, and which is tangential to the thread flank. The profile may comprise tangent flank arcs that are joined by a tangential flat at the root. Copyright 2004, Industrial Press, Inc., New York, NY
Machinery's Handbook 27th Edition METRIC SCREW THREADS M PROFILE 1785 The root profile of the internal thread must not be smaller than the basic profile. The maximum major diameter must not be sharp. General Symbols.—The general symbols used to describe the metric screw thread forms are shown in Table 1. Table 1. American National Standard Symbols for Metric Threads ANSI/ASME B1.13M-1983 (R1995) Symbol Explanation D Major Diameter Internal Thread D1 Minor Diameter Internal Thread D2 Pitch Diameter Internal Thread d Major Diameter External Thread d1 Minor Diameter External Thread d2 Pitch Diameter External Thread d3 Rounded Form Minor Diameter External Thread P Pitch r External Thread Root Radius T Tolerance TD1 , TD2 Tolerances for D1 , D2 Td , Td2 Tolerances for d, d2 ES Upper Deviation, Internal Thread [Equals the Allowance (Fundamental Deviation) Plus the Tolerance]. See Fig. 5. EI Lower Deviation, Internal Thread Allowance (Fundamental Deviation). See Fig. 5. G, H Letter Designations for Tolerance Positions for Lower Deviation, Internal Thread g, h Letter Designations for Tolerance Positions for Upper Deviation, External Thread es Upper Deviation, External Thread Allowance (Fundamental Deviation). See Fig. 5. In the ISO system es is always negative for an allowance fit or zero for no allowance. ei Lower Deviation, External Thread [Equals the Allowance (Fundamental Deviation) Plus the Tolerance]. See Fig. 5. In the ISO system ei is always negative for an allowance fit. H Height of Fundamental Triangle LE Length of Engagement LH Left Hand Thread Standard M Profile Screw Thread Series.—The standard metric screw thread series for general purpose equipment's threaded components design and mechanical fasteners is a coarse thread series. Their diameter/pitch combinations are shown in Table 4. These diameter/pitch combinations are the preferred sizes and should be the first choice as applicable. Additional fine pitch diameter/pitch combinations are shown in Table 5. Table 2. American National Standard General Purpose and Mechanical Fastener Coarse Pitch Metric Thread—M Profile Series ANSI/ASME B1.13M-1983 (R1995) Nom.Size Pitch Nom.Size Pitch Nom.Size Pitch Nom.Size Pitch 1.6 0.35 6 1 22 2.5 All dimensions are in millimeters. a 56 5.5 2 0.4 8 1.25 24 3 64 6 2.5 0.45 10 1.5 27 3 a For high strength structural steel fasteners only. a 72 6 3 0.5 12 1.75 30 3.5 80 6 3.5 0.6 14 2 36 4 90 6 4 0.7 16 2 42 4.5 100 6 5 0.8 20 2.5 48 5 … … Copyright 2004, Industrial Press, Inc., New York, NY
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