Use the following Service Factor Tables to determine the appropriate service factor based on operating conditions, specific application, or type of motor used. Once you have determined the appropriate service factor you can then return to your previous page to select your chosen service factor in the drop box provided.
| Service Factor | Operating Conditions |
|---|---|
| 1.00 | Moderate Shock - not more than 15 minutes in 2 hours Uniform Load - not more than 10 hours per day |
| 1.25 | Moderate Shock - not more than 10 hours per day Uniform Load - more than 10 hours per day |
| 1.50 | Heavy Shock - not more than 15 minutes in 2 hours Moderate Shock - more than 10 hours per day |
| 1.75 | Heavy Shock - not more than 10 hours per day |
| 2.00 | Heavy Shock - more than 10 hours per day |
| Duration of Service (Hours per Day) | Uniform Load | Moderate Shock | Heavy Shock | Extreme Shock |
|---|---|---|---|---|
| Occasional 1/2 Hour | - | - | 1.00 | 1.25 |
| Less than 3 Hours | 1.00 | 1.00 | 1.25 | 1.50 |
| 3-10 Hours | 1.00 | 1.25 | 1.50 | 1.75 |
| Over 10 Hours | 1.25 | 1.50 | 1.75 | 2.00 |
| Application | Additional Details | Up to 3 hrs/day | 3-10 hrs/day | Over 10 hrs/day |
|---|---|---|---|---|
| Agitators (Mixers) | Pure Solids | NA | 1.00 | 1.25 |
| Liquids and Solids | Liquids-Variable Density | 1.00 | 1.25 | 1.50 |
| Blowers | Centrifugal | 1.00 | 1.25 | NA |
| Blowers | Lobe | 1.00 | 1.25 | 1.50 |
| Blowers | Vane | NA | 1.00 | 1.25 |
| Brewing and Distilling | Bottling Machinery | NA | 1.00 | 1.25 |
| Brewing and Distilling | Brew Kettles, Continuous Duty | NA | 1.00 | 1.25 |
| Brewing and Distilling | Cookers, Continuous Duty | NA | 1.00 | 1.25 |
| Brewing and Distilling | Mash Tubs, Continuous Duty | NA | 1.00 | 1.25 |
| Brewing and Distilling | Scale Hopper, Frequent Starts | 1.00 | 1.25 | 1.50 |
| Can Filling Machines | NA | 1.00 | 1.25 | |
| Car | Dumper | 1.25 | 1.50 | 1.75 |
| Car | Puller | 1.00 | 1.25 | 1.50 |
| Clarifiers | NA | 1.00 | 1.25 | |
| Classifiers | 1.00 | 1.25 | 1.50 | |
| Clay Working Machinery | Brick Press | 1.25 | 1.50 | 1.50 |
| Clay Working Machinery | Briquette Machine | 1.25 | 1.50 | 1.50 |
| Clay Working Machinery | Pug Mill | 1.00 | 1.25 | 1.50 |
| Compactors | 1.50 | 1.75 | 2.00 | |
| Compressors | Centrifugal | NA | 1.00 | 1.25 |
| Compressors | Lobe | 1.00 | 1.25 | 1.50 |
| Compressors | Reciprocating, Multi-Cylinder | 1.00 | 1.25 | 1.50 |
| Compressors | Reciprocating, Single-Cylinder | 1.25 | 1.50 | 1.75 |
| Conveyors - General Purpose | Uniformly Loaded or Fed | NA | 1.00 | 1.25 |
| Conveyors - General Purpose | Not Uniformly Fed | 1.00 | 1.25 | 1.50 |
| Conveyors - General Purpose | Reciprocating or Shaker | 1.25 | 1.50 | 1.75 |
| Cranes - Dry Dock | Main Hoist | 1.25 | 1.50 | 1.75 |
| Cranes - Dry Dock | Auxilliaryt | 1.25 | 1.50 | 1.75 |
| Cranes - Dry Dock | Boom Hoist | 1.25 | 1.50 | 1.75 |
| Cranes - Dry Dock | Slewing Drive | 1.25 | 1.50 | 1.75 |
| Cranes - Dry Dock | Traction Drive | 1.50 | 1.75 | 2.00 |
| Container | Main Hoist | See Technical Services | ||
| Container | Boom Hoist | See Technical Services | ||
| Container | Trolly Drive | See Technical Services | ||
| Mill Duty | Main Hoist | See Technical Services | ||
| Mill Duty | Auxilliary | See Technical Services | ||
| Mill Duty | Bridge and Trolley Travel | See Technical Services | ||
| Industrial Duty | Main Hoist | 1.00 | 1.25 | 1.50 |
| Industrial Duty | Auxilliary | See Technical Services | ||
| Industrial Duty | Bridge and Trolley Travel | See Technical Services | ||
| Crusher | Stone or Ore | 1.50 | 1.75 | 2.00 |
| Dredges | Cable Reels | 1.00 | 1.25 | 1.50 |
| Dredges | Conveyors | 1.00 | 1.25 | 1.50 |
| Dredges | Cutter Head Drives | 1.25 | 1.50 | 1.75 |
| Dredges | Pumps | 1.00 | 1.25 | 1.50 |
| Dredges | Screen Drives | 1.25 | 1.50 | 1.75 |
| Dredges | Stackers | 1.00 | 1.25 | 1.50 |
| Dredges | Winches | 1.00 | 1.25 | 1.50 |
| Elevators | Bucket | 1.00 | 1.25 | 1.50 |
| Elevators | Centrifugal Discharge | - | 1.00 | 1.25 |
| Elevators | Escalators | See Technical Services | ||
| Elevators | Freight | See Technical Services | ||
| Elevators | Gravity Discharge | - | 1.00 | 1.25 |
| Extruders | General | 1.25 | 1.25 | 1.25 |
| Extruders | Plastics - Variable Speed Drive | 1.50 | 1.50 | 1.50 |
| Extruders | Plastics - Fixed Speed Drive | 1.75 | 1.75 | 1.75 |
| Extruders | Rubber- Continuous Screw Operation | 1.50 | 1.50 | 1.50 |
| Extruders | Rubber- Intermittent Screw Operation | 1.75 | 1.75 | 1.75 |
| Fans | Centrifugal | - | 1.00 | 1.25 |
| Fans | Cooling | See Technical Services | ||
| Fans | Forced Draft | 1.25 | 1.25 | 1.25 |
| Fans | Induced Draft | 1.00 | 1.25 | 1.50 |
| Fans | Industrial and Mine | 1.00 | 1.25 | 1.50 |
| Feeders | Apron | - | 1.00 | 1.25 |
| Feeders | Belt | 1.00 | 1.25 | 1.50 |
| Feeders | Disk | - | 1.00 | 1.25 |
| Feeders | Reciprocating | 1.25 | 1.50 | 1.75 |
| Feeders | Screw | 1.00 | 1.25 | 1.50 |
| Food Industry | Cereal Cooker | - | 1.00 | 1.25 |
| Food Industry | Dough Mixer | 1.00 | 1.25 | 1.50 |
| Food Industry | Meat Grinders | 1.00 | 1.25 | 1.50 |
| Food Industry | Slicer | 1.00 | 1.25 | 1.50 |
| Generators and Exciters | - | 1.00 | 1.25 | |
| Hammer Mills | 1.50 | 1.50 | 1.75 | |
| Hoists | Heavy Duty | 1.25 | 1.50 | 1.75 |
| Hoists | Medium Duty | 1.00 | 1.25 | 1.50 |
| Hoists | Skip Hoist | 1.00 | 1.25 | 1.50 |
| Laundry | Tumbler | 1.00 | 1.25 | 1.50 |
| Laundry | Washer | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Barkers - Spindle Feed | 1.25 | 1.25 | 1.25 |
| Lumber Industry | Barkers - Main Drive | 1.50 | 1.50 | 1.75 |
| Lumber Industry | Conveyors - Burner | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Conveyors - Main or Heavy Duty | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Conveyors - Main Log | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Conveyors - Re-Saw, Merry-Go-Round | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Conveyors - Slab | 1.50 | 1.50 | 1.75 |
| Lumber Industry | Conveyors - Transfer | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Chains - Floor | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Chains - Green | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Feeds - Edger | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Feeds - Gang | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Feeds - Trimmer | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Log Deck | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Log Haul - Incline - Well Type | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Log Turning Device | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Planer Feed | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Planer Tilting Hoists | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Rolls - Live - Off Brg. - Roll Cases | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Sorting Table | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Tipple Hoist | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Transfers - Chain | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Transfers - Causeway | 1.50 | 1.50 | 1.50 |
| Lumber Industry | Transfers - Tray Drives | 1.25 | 1.25 | 1.50 |
| Lumber Industry | Veneer Lathe Drives | See Technical Services | ||
| Metal Mills | Draw Bench Carriage & Main Drive | 1.00 | 1.25 | 1.50 |
| Metal Mills | Runout Table | 1.00 | 1.25 | 1.50 |
| Metal Mills | Non-Reversing Group Drives | 1.00 | 1.25 | 1.50 |
| Metal Mills | Non-Reversing Individual Drives | 1.50 | 1.50 | 1.75 |
| Metal Mills | Reversing | 1.50 | 1.50 | 1.75 |
| Metal Mills | Slab Pushers | 1.25 | 1.25 | 1.50 |
| Metal Mills | Shears | 1.50 | 1.50 | 1.75 |
| Metal Mills | Wire Drawing | 1.00 | 1.25 | 1.50 |
| Metal Mills | Wire Winding Machine | 1.00 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Bridles | 1.25 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Coilers & Uncoilers | 1.00 | 1.00 | 1.25 |
| Metal Strip Processing Machinery | Edge Trimmers | 1.00 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Flatteners | 1.00 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Loopers (Accumulators) | 1.00 | 1.00 | 1.00 |
| Metal Strip Processing Machinery | Pinch Rolls | 1.00 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Scrap Choppers | 1.00 | 1.25 | 1.50 |
| Metal Strip Processing Machinery | Shears | 1.50 | 1.50 | 1.75 |
| Metal Strip Processing Machinery | Slitters | 1.00 | 1.25 | 1.50 |
| Mills-Rotary Type | Ball & Rod | 1.50 | 1.50 | 1.75 |
| Mills-Rotary Type | Spur Ring Gear | 1.50 | 1.50 | 1.50 |
| Mills-Rotary Type | Helical Ring Gear | 1.50 | 1.50 | 1.50 |
| Mills-Rotary Type | Direct Connected | 1.50 | 1.50 | 1.75 |
| Mills-Rotary Type | Cement Kilns | 1.50 | 1.50 | 1.50 |
| Mills-Rotary Type | Dryers & Coolers | 1.50 | 1.50 | 1.50 |
| Mixers | Concrete | 1.00 | 1.25 | 1.50 |
| Paper Mills | Agitator (Mixer) | 1.50 | 1.50 | 1.50 |
| Paper Mills | Agitator for Pure Liquids | 1.25 | 1.25 | 1.25 |
| Paper Mills | Barking Drums | 1.75 | 1.75 | 1.75 |
| Paper Mills | Barkers - Mechanical | 1.75 | 1.75 | 1.75 |
| Paper Mills | Beater | 1.50 | 1.50 | 1.50 |
| Paper Mills | Breaker Stack | 1.25 | 1.25 | 1.25 |
| Paper Mills | Colander | 1.25 | 1.25 | 1.25 |
| Paper Mills | Chipper | 1.75 | 1.75 | 1.75 |
| Paper Mills | Chip Feeder | 1.50 | 1.50 | 1.50 |
| Paper Mills | Coating Rolls | 1.25 | 1.25 | 1.25 |
| Paper Mills | Conveyors - Chip, Bark, Chemical | 1.25 | 1.25 | 1.25 |
| Paper Mills | Conveyors - Log (Including Slab) | 1.75 | 1.75 | 1.75 |
| Paper Mills | Couch Rolls | 1.25 | 1.25 | 1.25 |
| Paper Mills | Cutter | 1.75 | 1.75 | 1.75 |
| Paper Mills | Cylinder Molds | 1.25 | 1.25 | 1.25 |
| Paper Mills | Dryers - Paper Machine | 1.25 | 1.25 | 1.25 |
| Paper Mills | Dryer - Conveyor Type | 1.25 | 1.25 | 1.25 |
| Paper Mills | Embosser | 1.25 | 1.25 | 1.25 |
| Paper Mills | Extruder | 1.50 | 1.50 | 1.50 |
| Paper Mills | Fourdrinier Rolls (Including Lump Breaker, Dandy Roll, Wire Turning, and Return Rolls) | 1.25 | 1.25 | 1.25 |
| Paper Mills | Jordan | 1.25 | 1.25 | 1.25 |
| Paper Mills | Kiln Drive | 1.50 | 1.50 | 1.50 |
| Paper Mills | Mt. Hope Roll | 1.25 | 1.25 | 1.25 |
| Paper Mills | Paper Rolls | 1.25 | 1.25 | 1.25 |
| Paper Mills | Platter | 1.50 | 1.50 | 1.50 |
| Paper Mills | Presses- Felt & Suction | 1.25 | 1.25 | 1.25 |
| Paper Mills | Pulper | 1.50 | 1.50 | 1.75 |
| Paper Mills | Pumps - Vacuum | 1.50 | 1.50 | 1.50 |
| Paper Mills | Reel (Surface Type) | 1.25 | 1.25 | 1.50 |
| Paper Mills | Screens - Chip | 1.50 | 1.50 | 1.50 |
| Paper Mills | Screens - Rotary | 1.50 | 1.50 | 1.50 |
| Paper Mills | Screens - Vibrating | 1.75 | 1.75 | 1.75 |
| Paper Mills | Size Press | 1.25 | 1.25 | 1.25 |
| Paper Mills | Super Colander | 1.25 | 1.25 | 1.25 |
| Paper Mills | Thickener - AC Motor | 1.50 | 1.50 | 1.50 |
| Paper Mills | Thickener - DC Motor | 1.25 | 1.25 | 1.25 |
| Paper Mills | Washer - AC Motor | 1.50 | 1.50 | 1.50 |
| Paper Mills | Washer - DC Motor | 1.25 | 1.25 | 1.25 |
| Paper Mills | Wind & Unwind Stand | 1.00 | 1.00 | 1.00 |
| Paper Mills | Winders - Surface Type | 1.25 | 1.25 | 1.25 |
| Paper Mills | Yankee Dryers | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Priming Processing | Intensive Internal Mixers - Batch Mixers | 1.75 | 1.75 | 1.75 |
| Plastics Industry - Priming Processing | Intensive Internal Mixers - Continuous Mixers | 1.50 | 1.50 | 1.50 |
| Plastics Industry - Priming Processing | Batch Drop Mill - 2 Smooth Rolls | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Priming Processing | Continuous Feed, Holding & Blend Mill | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Priming Processing | Compounding Mills | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Priming Processing | Colanders | 1.50 | 1.50 | 1.50 |
| Plastics Industry - Secondary Processing | Blow Molders | 1.50 | 1.50 | 1.50 |
| Plastics Industry - Secondary Processing | Coating | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Secondary Processing | Film | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Secondary Processing | Pipe | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Secondary Processing | Pre-Plasticizers | 1.50 | 1.50 | 1.50 |
| Plastics Industry - Secondary Processing | Rods | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Secondary Processing | Sheet | 1.25 | 1.25 | 1.25 |
| Plastics Industry - Secondary Processing | Tubing | 1.25 | 1.25 | 1.50 |
| Pullers | Barge Haul | 1.00 | 1.50 | 1.75 |
| Pumps | Centrifugal | - | 1.00 | 1.25 |
| Pumps | Proportioning | 1.00 | 1.25 | 1.50 |
| Pumps | Single Acting, 3 or more cylinders | 1.00 | 1.25 | 1.50 |
| Pumps | Double Acting, 2 or more cylinders | 1.00 | 1.25 | 1.50 |
| Pumps | Rotary - Gear Type | - | 1.00 | 1.50 |
| Pumps | Rotary - Lobe | - | 1.00 | 1.25 |
| Pumps | Rotary - Vane | - | 1.00 | 1.25 |
| Rubber Industry | Intensive Internal Mixers - Batch Mixers | 1.50 | 1.50 | 1.75 |
| Rubber Industry | Intensive Internal Mixers - Continuous Mixers | 1.25 | 1.50 | 1.50 |
| Rubber Industry | Mixing Mill - 2 Smooth Rolls (if corrugated rolls are used, then use the same service factors that are used for a Cracker-Warmer) | 1.50 | 1.50 | 1.50 |
| Rubber Industry | Batch Drop Mill - 2 Smooth Rolls | 1.50 | 1.50 | 1.50 |
| Rubber Industry | Cracker Warmer - 2 Roll: 1 Corrugated Roll | 1.75 | 1.75 | 1.75 |
| Rubber Industry | Cracker- 2 Corrugated Rolls | 1.75 | 1.75 | 1.75 |
| Rubber Industry | Holding, Feed & Blend Mill - 2 Rolls | 1.25 | 1.25 | 1.25 |
| Rubber Industry | Refiner - 2 Rolls | 1.50 | 1.50 | 1.50 |
| Rubber Industry | Colanders | 1.50 | 1.50 | 1.50 |
| Sand Miller | 1.00 | 1.25 | 1.50 | |
| Sewage Disposal Equipment | Bar Screens | - | 1.00 | 1.25 |
| Sewage Disposal Equipment | Chemical Feeders | - | 1.00 | 1.25 |
| Sewage Disposal Equipment | Dewatering Screens | 1.00 | 1.25 | 1.50 |
| Sewage Disposal Equipment | Scum Breakers | 1.00 | 1.25 | 1.50 |
| Sewage Disposal Equipment | Slow or Rapid Mixers | 1.00 | 1.25 | 1.50 |
| Sludge Collectors | 1.00 | 1.00 | 1.25 | |
| Thickner | 1.00 | 1.25 | 1.50 | |
| Vacuum Filters | 1.00 | 1.25 | 1.50 | |
| Screens | Air Washing | - | 1.00 | 1.25 |
| Screens | Rotary - Stone or Gravel | 1.00 | 1.25 | 1.50 |
| Screens | Traveling - Water Intake | - | 1.00 | 1.25 |
| Sugar Industry | Beet Slicer | 1.50 | 1.50 | 1.75 |
| Sugar Industry | Cane Knives | 1.50 | 1.50 | 1.50 |
| Sugar Industry | Crusher | 1.50 | 1.50 | 1.50 |
| Sugar Industry | Mills - Low Speed End | 1.50 | 1.50 | 1.50 |
| Textile Industry | Batchers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Calenders | 1.00 | 1.25 | 1.50 |
| Textile Industry | Cards | 1.00 | 1.25 | 1.50 |
| Textile Industry | Dry Cans | 1.00 | 1.25 | 1.50 |
| Textile Industry | Dryers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Dyeing Machinery | 1.00 | 1.25 | 1.50 |
| Textile Industry | Looms | 1.00 | 1.25 | 1.50 |
| Textile Industry | Mangles | 1.00 | 1.25 | 1.50 |
| Textile Industry | Nappers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Pads | 1.00 | 1.25 | 1.50 |
| Textile Industry | Slashers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Soapers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Spinners | 1.00 | 1.25 | 1.50 |
| Textile Industry | Tenter Frames | 1.00 | 1.25 | 1.50 |
| Textile Industry | Washers | 1.00 | 1.25 | 1.50 |
| Textile Industry | Winders | 1.00 | 1.25 | 1.50 |
