HTD vs GT2 Timing Belts

Two Curvilinear Profiles, Two Different Jobs

HTD and GT2 belts both use rounded, curvilinear teeth — but they sit at opposite ends of the motion-control spectrum. GT2 is a fine-pitch belt built for light, high-resolution motion. HTD is a torque belt built for power transmission. The difference in pitch is the whole story: GT2’s 2 mm pitch buys resolution; HTD’s 5-14 mm pitch buys load capacity.

The Quick Comparison

	GT2 / 2GT	HTD 5M	HTD 8M	HTD 14M
Tooth pitch	2 mm	5 mm	8 mm	14 mm
Typical width	6 mm	6-30 mm	9-50 mm	20-85 mm
Torque capacity	Light	Medium	Medium-high	High
Resolution	Highest	High	Medium	Low
Typical use	3D printers, CNC, small stages	Actuators, small conveyors	Packaging, general drives	Heavy industrial drives
Belt material	Polyurethane	PU or rubber	PU or rubber	Rubber standard
Common form	Open-ended	Open-ended + endless	Endless + open-ended	Endless

What the Tooth Profiles Do Differently

Both profiles are curvilinear, meaning the tooth face curves into the pulley groove. But:

GT2 teeth are smaller and closer together. More teeth in engagement on a small pulley means finer positioning resolution and lower vibration at light loads.
HTD teeth are deeper and larger. Each tooth engages a bigger pulley surface, so the belt transmits more torque before the teeth shear or skip.

A GT2 belt on an HTD pulley (or the reverse) will not work: the pitches do not match, and the teeth will skip within a few revolutions.

Application Fit: Which Belt Where

3D Printers and Laser Cutters: GT2

Cartesian printers move light carriages at moderate speeds with high repeatability. A 6 mm GT2 belt over a 20-tooth pulley gives the resolution that keeps print layers aligned. Layer shift on a printer is almost always a worn GT2 belt or a loose one.

Linear Actuators and Gantries: GT2 or HTD 5M

Light gantries and desktop actuators run GT2. Heavier gantries and industrial actuators step up to HTD 5M with steel tension members — the extra width and deeper teeth carry the moving mass without stretch.

Packaging and General Power Transmission: HTD 8M

When the job is transmitting power — packaging machines, conveyors, pumps — HTD 8M is the default. It carries real torque, runs quiet, and never needs lubrication. If you are converting a chain or V-belt drive, 8M is the usual starting point.

Heavy Industrial Drives: HTD 14M

Pumps, compressors, large conveyors, and 24/7 lines use 14M. At this scale the belt replaces chains and gears with a maintenance-free synchronous drive.

Which Belt Is “Better”?

Neither is better — they are sized for different jobs. The practical question is what the drive needs:

Load: If the belt is under-sized, the teeth skip or the cords stretch. Match torque capacity to the load.
Resolution: If positioning accuracy matters, smaller pitch (GT2) wins where load allows.
Existing drive: If you are replacing a belt, match the existing pitch exactly. That is the only rule that is not a trade-off.
Environment: Polyurethane for wash-down and food, rubber for hot service — independent of pitch.

Can I Replace a GT2 Belt with HTD or Vice Versa?

No. The tooth pitch and profile must match the pulley. A GT2 pulley has 2 mm grooves; an HTD 5M pulley has 5 mm grooves. Changing pitch means changing both pulleys and the belt — and usually the center distance too.

Buying Advice

For printers and light axes: stick with GT2, 6 mm wide, fiberglass core. Match the belt length to your axis (measure center-to-center and add the wrap allowance).
For actuators and light industrial: HTD 5M, 15-25 mm wide, steel core for precision or fiberglass for economy.
For power transmission: HTD 8M or 14M, width sized to the motor power. Send us the motor specs and we will size it.

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