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Features of Size

GD&T

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Rule #1

Where only a tolerance of size is specified, the limits of size of an individual feature prescribe the extent to which variations in its geometric form, as well as size, are allowed. (ASME Y14.5M – 1994)

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What is a Feature of Size?

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What is a Feature of Size

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Feature of Size

Can Be:

  • Cylindrical
  • Spherical
  • Equal Opposing Parallel Surfaces

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Cylindrical

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Spherical

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Parallel Opposing Sides

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Caliper Test

Features of size must first pass the caliper test.

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See Tec-Ease, Inc:

http://www.tec-ease.com/gdt-tips-view.php?q=132

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2009 Change

Features of size can be treated as individuals (above) or as irregular (groups).

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See: http://gdtseminars.com/blog/2009/11/11/a-new-feature-of-the-2009-gdt-standard/

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http://www.etinews.com/blog/2010/12/20/whats-new-in-asme-y14-5-2009-definition-of-feature-of-size/