V-belt Mitsuboshi B 121

MITSUBOSHI B 121 belongs to v-belt, part of our Power transmission range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for B 121 and any equivalents.

This page covers the Mitsuboshi B 121, a classical V-belt with a B profile. It is used in industrial drives where a dependable, standard-profile belt is required. The B 121 is identified by its part number and profile, not by a length in millimeters.

The B 121 has a top width of 17 mm, a height of 11 mm and a 40° angle. These dimensions match the B profile, which is common on drives that use classical V-belts rather than narrow wedge belts. When you replace a belt on a B-profile drive, confirm that the old belt is marked B 121 or that the drive accepts a B-profile belt with these dimensions.

To confirm fit, read the marking on the back of the old belt and compare it to B 121. Also check the pulley groove width and the belt's cross-section. If the old belt is worn or the marking is unreadable, measure the top width and height with a caliper and compare to 17 mm and 11 mm. The 40° angle is the standard included angle for this profile.

If you need help identifying the correct belt, send the part number B 121 and the drive details by WhatsApp or email. The team can confirm the profile and dimensions and suggest an equivalent where one exists. For drives with multiple belts, replace all belts at the same time to keep the load evenly distributed.