1.2GT Timing Belt system is an extension of the HTD system with greater load-carrying capacity. HTD develope for high torque drive applications, but is not acceptable for most precision indexing or registration applications.
2.As smaller diameter pulleys are used, the clearance required to operate properly is increased. HTD drive clearance, using small diameter pulleys, is approximately four times greater than an equivalent GT2 timing belt drive.
3.circular arc tooth profile, tooth space is small, suitable for straight line driving.