CMAA Crane Duty Classifications explained

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CMAA Crane Duty Classifications explained

Here’s what you need to know about CMAA crane classifications in Canada.

CMAA is the Crane Manufacturers Association of America, Inc., an independent trade association affiliated with the Material Handling Industry. CMAA traces its roots to the Electric Overhead Crane Institute, known as EOCI, which was founded in 1927 by leading crane manufacturers of that time to promote the standardization of cranes as well as uniform quality and performance. The voluntary association was incorporated as the Crane Manufacturers Association of America, Inc. in 1955. Member Companies, representing the industry leaders in the overhead crane industrycome from the United States, Canada, and Mexico.

CMAA has set up a standard for crane classifications that are used to help define the use of a crane. These standards are based on capacity and usage and help us to select the right hoist and crane for your operations. Accepted as the industry norm in Canada, US, and Mexico they help to insure standards are in place across manufacturer’s and installers, which ensures that the end user has a crane lifting system that matches their needs.

CMAA_Crane Service Classes tearsheet download.

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

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

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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