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ISO - International Standards Organization .

The International Organization for Standardization (ISO) is a worldwide federation of national standards bodies.

This organization has produced a standard (ISO 484/2) that defines the manufacturing tolerances for marine propellers.

ISO 484 Accuracy Classes
Class
Description
S
Very High Accuracy
I
High Accuracy
II
Medium Accuracy
III
Wide Tolerances

ISO Tolerances on Pitch
Class
  S I II III
a) Local Pitch Pitch of one portion of one blade ± 1.5% ± 2% ± 3% -
b) Section Pitch Mean pitch of one radii of one blade ± 1% ± 1.5% ± 2% ± 5%
c) Blade Pitch Mean pitch of one blade ± 0.75% ± 1% ± 1.5% ± 4%
d) Propeller Pitch Mean pitch of all blades ± 0.5% ± 0.75% ± 1% ± 3%



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