H 300 timing pulleys (3" belt)

H 300 timing pulleys are the widest pulleys of the H profile, designed for belts with a pitch of 1/2" (12.7 mm) and a width of 3" (76.2 mm). They provide the highest load capacity in this profile and run in the heaviest drives with an H belt.

H 300 timing pulleys - high torque on the widest H belt

The widest H belt lets you transmit high torque without moving to a larger profile and without changing pulley diameters - you keep the existing drive layout. The long hub guides the wide pulley stably on the shaft. Smaller pulleys are made of C45 steel, and larger ones of grey cast iron, which dampens vibration well.

H 300 synchronous pulleys: pilot bore and for longer Taper-Lock bushes

H 300 pulleys in the Pilot bore and Taper-Lock subgroups. Due to their large width, the Taper-Lock pulleys have seats for longer bushes, which guide the pulley better. Dimensions are given on the product page.

Questions and answers: H 300 timing belt pulleys

What if H 300 is not enough?

For even higher loads, consider the XH profile with a 7/8" pitch, which has much larger teeth. This requires replacing the pulleys and the belt.

Why are the smallest pulleys available only with a pilot bore?

A seat for a taper bush needs a sufficiently large pulley diameter. The smallest H 300 pulleys can therefore be found in the Pilot bore group.