Typical Bearing Life in Hours

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Typical Bearing Life in hours for Various Design Applications

Application	Design life hours
Agricultural equipment	3000 – 6000
Aircraft equipment	500 – 2000
Automotive
Race car	500 – 800
Light motor cycle	600 – 1200
Heavy motor cycle	1000 – 2000
Light cars	1000 – 2000
Heavy cars	1500 – 2500
Light trucks	1500 – 2500
Heavy trucks	2000 – 2500
Buses	2000 – 5000
Electrical
Household appliances	1000 – 2000
Motors ≤ 1⁄2 hp	1000 – 2000
Motors ≤ 3 hp	8000 – 10000
Motors, medium	10000 – 15000
Motors, large	20000 – 30000
Elevator cables sheaves	40000 – 60000
Mine ventilation fans	40000 – 50000
Propeller thrust bearings	15000 – 25000
Propeller shaft bearings	> 80000
Gear drives
Boat gearing units	3000 – 5000
Gear drives	> 50000
Ship gear drives	20000 – 30000
Machinery for 8 hour service which are not always fully utilized	14000 – 20000
Machinery for 8 hour service which are fully utilized	20000 – 30000
Machinery for continuous 24 hour service	50000 – 60000

Application	Design life hours
Gearing units
Automotive	600 – 5000
Multipurpose	8000 – 15000
Machine tools	20000
Rail Vehicles	15000 – 25000
Heavy rolling mill	> 50000
Machines
Beater mills	20000 – 30000
Briquette presses	20000 – 30000
Grinding spindles	1000 – 2000
Machine tools	10000 – 30000
Mining machinery	4000 – 15000
Paper machines	50000 – 80000
Rolling mills
Small cold mills	5000 – 6000
Large multipurpose mills	8000 – 10000
Rail vehicle axle
Mining cars	5000
Motor rail cars	16000 – 20000
Open–pit mining cars	20000 – 25000
Streetcars	20000 – 25000
Passenger cars	26000
Freight cars	35000
Locomotive outer bearings	20000 – 25000
Locomotive inner bearings	30000 – 40000
Machinery for short or intermittent operation where service interruption is of minor importance	4000 – 8000
Machinery for intermittent service where reliable operation is of great importance	8000 – 14000
Instruments and apparatus in frequent use	0 – 500