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CMAA Crane Duty Classifications

Crane Classification Typical Installation # Lifts per/hr. Average Lift Shift Typical Workload Key Points
Class A Standby or Infrequent Service Power Houses Public Utilites Turbine Rooms Motor Rooms Transformer Stations 0 - 2 10 ft. Single Shift Operation
  • Precise handling at slow speeds with idle periods between lifts
  • Capacity loads may be handled for intial installation of equipment and for infrequent maintenance
  • H1 Hoist
  • Maintenace crane in machine house
  • Used only occasionally
Class B Light Service Repair Shops Light Assembly Operations Light Warehousing 2 - 5 10 ft. Single Shift Operation
  • Loads vary from no load to occasional full rated loads
  • H2 Hoist
  • Light service requirements
  • Slow speed
Class C Moderate Service Machine Shops Paper Mills Machine Rooms 5 - 10 15 ft. Single Shift Operation
  • Average load is 50% of rated load
  • 50% of less of the lifts are at the rated capacity
  • H3 Hoist
  • Minimum 1.15 service factor on bridge motion
  • 5,000 L-10 bearing life
Class D Heavy Service Heavy Machine Shops Foundries Fabricating Plants Steel Warehouses Container Yards Lumber Mills Stanadard Duty Bucket & Magnet Operations 10 - 20 15 ft. 1 - 2 Shift Operation
  • Average loads approaching 50% are continuously handled
  • 50% of less of the lifts are at the rated capacity
  • H4 Hoist
  • Minimum 1.3 service factor on bridge motion
  • 10,000 L-10 bearing life
  • Lift the maximum capacity with 30% frequency
  • Typically faster speeds over Class C

A Built-Up Hoist is typically used in this type of application and is tailored towards a specific application with a heavy duty cycle to handle demanding needs.

Class E Severe Service Magnet Bucket Magnet/Bucket Combo Scrap Yards Cement Mills Lumber Mills Fertilizer Plans Container Handling 20+ 20+ ft. 24/7 Continuously
  • Continuous use at/or near capacity
  • H4+ Hoist
  • Minimum 1.75 service factor on bridge motion
  • 20,000 L-10 bearing life
  • Continuously lifts at the maximum capacity
  • Typically faster speeds over Class C and D

A Built-Up Hoist is typically used in this type of application and is tailored towards a specific application with a heavy duty cycle to handle demanding needs.

Hoist Classification Corresponding Crane Class Corresponding Crane Class
FEM HMI ISO CMAA DIN 15018 & SIM. EXAMPLE
1Cm H1 M2 CLASS A H1/B2
  • Maintenace crane in machine house
  • Used only occasionally
1Bm H2 M3 CLASS B H1/B2
  • Light duty work shop crane
  • Single shift operation
  • Low average loads
  • Maximal load lifted occasionally
1Am H3 M4 CLASS C H2/B3
  • Light/Med duty work shop crane
  • Single shift operation
  • Medium average loads
  • Occasionally lifting of max load
2m H4 M5 CLASS D H2/B3
  • Heavy duty crane, 2 shift operation
  • 1 or 2 shift operation
  • Regular medium and heavy loads
3m H4 M6 CLASS D H2/B3
or
H3/B4
  • Med/heavy duty work shop crane
  • Nominal load regularly lifted
  • Traverse or other dead loads below the hook
4m H4 or H5 M7 CLASS D or CLASS E H3/B4 or H4/H6
  • Very heavy duty crane
  • 2 - 3 shift operation
  • Grab or magnet below the hook
  • Regular heavy loads
Key
FEM - Federation Europeenne de la Manutention
(European Federation of Material Handling)

HMI - Hoist Manufacturers Institute

ISO - International Organization for Standardization

CMAA - Crane Manufacturers Association of America

DIN - Federation Europeenne de la Manutention
(German Institute for Standardization)

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