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    ISO 4156


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    [2:03 pm, 20/06/2022] E-Certifications: ISO 4156-1:2005(EN), Straight cylindrical involute splines

    ISO 4156-1 was created by Technical Committee ISO/TC 14, Shafts for machinery and accessories.
    This first edition of ISO 4156-1, together with ISO 4156-2 and ISO 4156-3 replaced ISO 4156:1981 and ISO 4156:1981 of which it constitutes a technical revision. The values and tables are the same as in ISO 4156:1981; however, some explanations and definitions have been revised.
    ISO 4156 consists of the following parts, under the general title Straight cylindrical involute splines — Metric module, side fit:
    — Part 1: Generalities
    — Part 2: Dimensions
    — Part 3: Inspection
    ISO 4156:2005 defines the data and indications necessary for the design, manufacture and inspection of straight (non-helical) side-fitting cylindrical involute splines.
    Straight cylindrical involute splines manufactured in accordance with ISO 4156:2005 are used for clearance, sliding and interference connections of shafts and hubs. They contain all the necessary characteristics for the assembly, transmission of torque, and economic productions.
    The nominal pressure angles are 30°, 37,5° and 45°. For electronic data processing purposes, the form of expression 37,5° has been adopted instead of 37°30′. ISO 4156 develops a specification based on the following modules:
    — for pressure angles of 30° and 37,5° the module increments are 0,5; 0,75; 1; 1,25; 1,5; 1,75; 2; 2,5; 3; 4; 5; 6; 8; 10
    — for pressure angle of 45° the module increments are 0,25; 0,5; 0,75; 1; 1,25; 1,5; 1,75; 2; 2,5
    Limit dimensions, tolerances, manufacturing errors and their effects on the fit between connecting coaxial spline elements are defined in the equations and given in standard.

    For more support regarding ISO 4156:2005, please contact us at +91-8595603096 or send us an email at support@pacificcert.com
    [2:03 pm, 20/06/2022] E-Certifications: ISO 31-0:1992 Quantities and units
    ISO 31:1992 shared general information about principles concerning physical quantities, equations, quantity and unit symbols, and coherent unit systems, especially the International System of Units, SI, including recommendations for printing symbols and numbers. First part includes a guide to terms used in names for physical quantities, second part is a guide to the rounding of numbers, third part is about international organizations in the field of quantities and units.
    This standard has been withdrawn and has been revised by ISO 80000-1:2009
    For more support regarding the standard, please contact us at +91-8595603096 or send us an email at support@pacificcert.com