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ASME Classifications
The ASME Hoist Duty Classification is a rating system to make sure a hoist is suitable for the application. It is based on a combination of how often the hoist is used and how much of its capacity is used.
| ASME Duty Classes | Service Classification | Description |
| H1 | Infrequent or Standby | Idle 1-6 months, used for installation and/or maintenance |
| H2 | Light | Light maintenance, fabrication; capacity loads infrequently handled; randomly distributed loads; low running time |
| H3 | Standard | General machining; randomly distributed loads; total running time ≤ 25% of working period |
| H4 | Heavy | High volume handling of heavy loads near rated capacity; steel warehousing, machining, foundries; total running time ≤ 50% of working period |
| H5 | Severe | bulk material handling with attachments; approach continuous operation |