Timing belt Optibelt 10 AT3 / 639

OPTIBELT 10 AT3 / 639 belongs to timing 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 10 AT3 / 639 and any equivalents.

The Optibelt 10 AT3 / 639 is an Alpha Torque timing belt with an AT3 profile, a 639 mm length and a 3 mm pitch. When you need to replace a timing belt, the marking on the back of the old belt is the most reliable starting point. This page covers what that marking tells you and how to use it to request the correct belt.

The marking on the back of a timing belt typically includes the profile and the length. For this belt, the profile is AT3 and the length is 639 mm. The pitch, which is the distance between tooth centers, is 3 mm. These three values identify the belt's tooth geometry and overall length. If the old belt is worn or dirty, clean the back with a cloth and read the characters carefully; the profile and length are the key fields to match.

Once you have the marking, compare it to the belt you need to order. The Optibelt 10 AT3 / 639 is a timing belt in the Alpha Torque series. If the marking on your old belt reads AT3 and 639 mm, this belt matches those specifications. If the marking is different, note the profile and length from the old belt and send them to us. We carry Optibelt timing belts and can help confirm the right belt for your drive.

To request a quote, send the part number 10 AT3 / 639 by WhatsApp or email. If you do not have the part number, send a photo of the marking on the old belt along with the profile and length. Our team replies promptly and can help confirm the right belt or suggest an equivalent. For drives with multiple belts, it is good practice to inspect all belts and replace them as a set when needed.