ISO GENERAL PURPOSE METRIC SCREW THREADS. Limits of Sizes for Bolt and Nut Threads. Reference # ISO /, # ISO / Coarse and. 7 Jan Part 1: Principles and basic data (ISO , IDT) The International Standard ISO has the status of a Swedish Standard. 15 Dec International Standard ISO was prepared by Technical Committee ISO/TC 1, Screw threads, Subcommittee. SC 2, Tolerances. This third.

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The list of metric screw thread used in general engineering applications are given iso 965-1 the General Purpose Metric Screw Threads Table. Pitch diameter tolerance of external thread. Minor diameter tolerance of internal thread.

Use this tolerance class for commercial internal threads. Iso 965-1 thread minimum truncation [C min ]. Tolerance Class for Nut. For more information on Jso screw threads including thread form, definitions, limits and fits for threads, standard series and combinations, thread designation, basic dimensions, dimensional effect of coating, formulas and details of MJ profile, please refer to pages – of Machinery’s Handbook, 30th.

The user shall use 6g for bolts and 6H for nuts 9655-1 there is a specific requirement to use other tolerance classes. For coated threads, the tolerances apply to the parts before coating, unless otherwise stated. External thread minimum minor diameter [d 3min ]. The maximum diameter of iso 965-1 thread which is diameter of the crest of a male thread or root of a female thread. The surface at the top of the ridge connecting iso 965-1 two flanks.


External thread minimum pitch diameter [d iso 965-1 ]. Major diameter tolerance of external thread.

Pitch diameter tolerance of internal thread. Internal thread maximum pitch diameter [D 2max ]. General Engineering Iso 965-1 Custom Use.

Nominal Diameter x Pitch – Tolerance class for pitch diameter – Tolerance class for major diameter M10 x 1 5g 6g.

M10 x 1 6g. Internal thread maximum minor diameter [D 1max iso 965-1. For external bolt threads; The actual root contours shall not at any point transgress the basic profile.

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After coating, the actual thread profile shall not at any point transgress the iso 965-1 material limits for positions h or H. External bolt thread root profile is given the “Definitions” section.

The theoretical profile of a iso 965-1 thread in an axial plane defined by theoretical dimensions and angles common to internal and external threads. Tolerance Class for Bolt. Metric thread size and tolerance calculator was developed to calculate major, minor and pitch diameters of iso 965-1 external bolt and internal nut metric threads according to 9665-1 The minimum diameter of a thread jso is diameter of the root of a male thread or crest of a female thread. External thread iso 965-1 major diameter [d max ].


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For izo of the other classes, refer to ISO Thread basic minor diameter [d iso 965-1D 1 ]. External thread minimum major iso 965-1 [d min ]. External thread maximum iso 965-1 diameter [d 3max ]. Tolerance class can be selected among the alternatives 6e, 6f, 6g and 4h for bolts and 5H, 6H, 7H and 6G for nuts. External thread maximum pitch diameter [d 2max ].

Internal thread minimum pitch diameter [D 2min ]. Internal thread minimum major diameter [D min ]. Thread basic pitch diameter [d 2D 2 ]. 9651-

Height of fundamental triangle [H]. Use this tolerance class for commercial external bolt threads. Details for the manufacture and use of gauges for checking ISO general-purpose metric screw threads are specified in the ISO In addition to basic 96-1 calculations of metric threads, tolerance calculations of different tolerance classes can be done according to ISO AmesWeb Calculators Screw 96-51. In general engineering use, calculations can be done by selecting a standard iso 965-1 thread size from the list which iso 965-1 metric thread sizes in the diameter range from 1.