SS-ISO-21940-32 Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention (ISO 21940-32:2012, IDT)

SS-ISO-21940-32 - 2021 EDITION - CURRENT

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ISO 21940-32:2012 specifies one convention for balancing the individual components (shaft and fitments) of a keyed rotor assembly. This provides compatibility of all balanced components so that when they have been assembled the overall balance tolerance and/or vibration limit for the rotor assembly is met. ISO 21940-32:2012 specifies that half-keys be used when balancing the individual components of a keyed rotor assembly. It also specifies a marking of the components balanced in accordance with the key convention used. ISO 21940-32:2012 applies to rotors balanced in a balancing machine, in their own bearings or in situ. The key convention can also be applied when measuring the residual unbalance and/or vibration of rotors with keyways, but to which fitments have not yet been assembled. In addition to applying to keys of constant rectangular or square cross-section mounted parallel to the shaft centreline, ISO 21940-32:2012 also applies to keys mounted on tapered shaft surfaces, to woodruff, gibhead, dowel and other special keys. The principle of the half-key convention is applied as is appropriate to the particular shape and location of the special key.

To find similar documents by classification:

21.120.10 (Shafts)

21.120.40 (Balancing and balancing machines)

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Designation Name

SS-ISO 21940-32:2021

Revision Level




Publication Date

April 25, 2021



Page Count


International Equivalent

ISO 21940-32:2012(IDT)