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How to Download UNI ISO 4156 PDF for Free



How to Download UNI ISO 4156 PDF for Free




UNI ISO 4156 is a series of international standards that provide the data and indications necessary for the design, manufacture and inspection of straight (non-helical) side-fitting cylindrical involute splines. These splines are used for clearance, sliding and interference connections of shafts and hubs.


uni iso 4156 pdf download



If you are looking for a free PDF version of UNI ISO 4156, you may be interested in the following steps:


  • Go to https://www.iso.org/obp/ui/, which is the official online browsing platform of ISO standards.



  • In the search box, type "ISO 4156" and click on the magnifying glass icon.



  • You will see a list of three parts of UNI ISO 4156: Part 1: Generalities, Part 2: Dimensions and Part 3: Inspection. Click on the part that you want to download.



  • On the right side of the page, you will see a preview of the standard and a button that says "Buy this standard". Click on it.



  • You will be redirected to a page where you can choose your preferred currency and payment method. You will also see the price of the standard, which varies depending on the part. For example, Part 1 costs 58 CHF (Swiss francs), which is equivalent to about 63 USD (United States dollars).



  • If you agree with the price and the terms and conditions, click on "Add to cart" and proceed to checkout.



  • After you complete your payment, you will receive an email with a link to download your PDF copy of UNI ISO 4156.



Note that this is the only legitimate way to obtain a PDF version of UNI ISO 4156. Any other websites that claim to offer free or cheap downloads of this standard may be illegal, unreliable or infected with malware. Therefore, we advise you to avoid them and use the official ISO website instead.


UNI ISO 4156 is based on the principle of the involute curve, which is a type of curve that has many applications in engineering and mathematics. An involute curve is generated by tracing the end point of a string that is unwound from a circle. The advantage of using involute curves for splines is that they allow for a constant angular velocity ratio between the shaft and the hub, regardless of the radial displacement.


The three parts of UNI ISO 4156 cover different aspects of straight cylindrical involute splines. Part 1: Generalities provides the basic definitions, symbols, formulas and tolerances for the design and calculation of splines. Part 2: Dimensions specifies the dimensions and profiles of the splines, as well as the tables of standard modules and numbers of teeth. Part 3: Inspection describes the methods and instruments for measuring and verifying the conformity of splines.


UNI ISO 4156 is compatible with other ISO standards related to splines, such as ISO 4156-4:2005, which deals with helical cylindrical involute splines, and ISO 14:1982, which deals with straight-sided splines for cylindrical shafts. UNI ISO 4156 is also compatible with other national standards, such as DIN 5480 (Germany), NF E22-141 (France) and BS 3550 (United Kingdom). 0efd9a6b88


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