What is hoist duty? The ASME Hoist Duty Classification is a rating system to make sure a hoist is suitable for the application. It’s based on a combination of how often the hoist is used and how much of its capacity is used.
Find a listing of ASME Duty Classes here and below, including service descriptions and a table of usage times.
Most hoists purchased for commercial or industrial use have an H3 or H4 duty rating. If you need an H5 rated hoist, please contact us about your application.
What's the toughest duty for a hoist? Read our blog post to learn more. See also: The Top Hoist Purchasing Mistakes to Avoid.
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ASME Duty Classes
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Service Classification
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Description
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H1
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Infrequent or Standby
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Idle 1-6 months, used for installation and/or maintenance
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H2
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Light
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Light maintenance, fabrication; capacity loads infrequently handled; randomly distributed loads; low running time
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H3
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Standard
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General machining; randomly distributed loads; total running time ≤ 25% of working period
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H4
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Heavy
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High volume handling of heavy loads near rated capacity; steel warehousing, machining, foundries; total running time ≤ 50% of working period
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H5
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Severe
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Bulk material handling with attachments; approach continuous operation
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