HTD single sided timing belts have a Curvilinear tooth profile for improved stress distribution, reduced tooth jump due to deeper tooth design. They have high efficiency due to positive engagement between belt teeth and the pulley grooves. No re-tensioning required. - Free from maintenance. - Increased power transmission capacity. No high tension required. Supplied in one of the following brands: Dunlop, Challenge, Medway, Trans-flex, Megadyne.