The first synchronous belts had a trapezoidal tooth profile and are often called timing belts. Synchro-Cog® timing belts are an excellent choice for energy efficient, low maintenance performance on positive drive applications. Synchro-Cog® provides a wide range of load capacities and speeds. Belts are oil, heat and abrasion resistant. No lubrication is required so you can enjoy clean, maintenance free performance. Synchro-Cog® is ideal for use in positioning applications or on inaccessible drives where maintenance is difficult. Synchro-Cog® eliminates lubrication and re-tensioning and provides a long service life. Timken Belts Synchro-Cog® Timing Gearbelt, Light, 50 Teeth, 3/8 in Pitch, 3/4 in Width