How much torque and power can a timing belt drive transmit?

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Direct answer: There is no single number: capacity is set by pitch, width, pulley diameter and speed together. Small pitches transmit a few kilowatts, mid pitches tens of kilowatts, and wide 8M to 14M industrial belts can reach into the hundreds of kilowatts. Correct sizing always goes through the rating tables of the specific belt type, corrected by a service factor.An H-pitch belt like 400H-225 sits in the classic tens-of-kilowatts industrial range.What actually sets the capacityPitch and tooth form: a bigger pitch means longer teeth in contact and more torque carried per tooth.Belt width: capacity scales close to linearly with width, which is why width is the usual sizing lever once the pitch is chosen.Pulley diameter: larger pulleys wrap more teeth and bend the belt less, so they allow more power per unit width.Speed: transmitted power rises with speed at first, then centrifugal effects and heat build-up limit further gains.Duty conditions: shock loads, frequent starts, high ambient temperature and backside idlers all reduce the usable rating.Wide 8M belts such as 8M-2320-35 are the workhorses of heavy industrial drives.Typical industrial power ranges by pitch familyPitch familyTypical useRough power range at moderate speedMXL, XL, LOffice machines, small appliances, light conveyorsFractions of a kW up to roughly 10 kWH, XHIndustrial machinery, pumps, compressorsRoughly 10 kW up to around 100 kW3M to 5MCompact drives, power tools, small equipmentFractions of a kW up to around 20 kW8MHeavy industrial drivesTens of kW up to roughly 150 kW14MLarge high-power drivesHundreds of kW in wide buildsS8M-984-50: the S8M family is common in high-torque industrial drives. These ranges are for orientation only. Final sizing uses the rating tables of the actual belt type, corrected with a service factor for the driven machine, start frequency and ambient conditions. Guessing a width without the service factor is the fastest route to premature tooth shear.Have us size the driveEmail sales@goodlybelts.com with the motor power, speed ratio, centre distance and duty cycle, or use the enquiry form. We will propose pitch, width and pulley sizes and confirm the rating against the actual belt data.Size my drive

How much torque and power can a timing belt drive transmit?

What actually sets the capacity

Typical industrial power ranges by pitch family

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Pitch family	Typical use	Rough power range at moderate speed
MXL, XL, L	Office machines, small appliances, light conveyors	Fractions of a kW up to roughly 10 kW
H, XH	Industrial machinery, pumps, compressors	Roughly 10 kW up to around 100 kW
3M to 5M	Compact drives, power tools, small equipment	Fractions of a kW up to around 20 kW
8M	Heavy industrial drives	Tens of kW up to roughly 150 kW
14M	Large high-power drives	Hundreds of kW in wide builds