Glossary of Terms

Denier: A measure of weight of a reinforcing cord equal to grams per 9000 meters

Durometer: A common measure of hardness for plastics. Typically reported as Shore A or Shore D

Kevlar®: DuPont's™ tradename for their aramid fiber. This reinforcement is used in belting applications due to its high modulus (high strength, low elongation)

Z or S Twist: The direction that a cord is twisted (right or left hand). Gates Mectrol alternates S and Z reinforcing cords to eliminate tracking problems

Zero Backlash Pulley: A pulley machined with a tooth profile that minimizes the play when a timing belt is in mesh

DuPont™ and KEVLAR® are trademarks or registered trademarks of E.I. du Pont de Nemours and Company