
Timing belt Optibelt 6 AT3 / 639 AP
- Brand
- OPTIBELT
- Category
- Power transmission
- Subcategory
- Timing belts
- Series
- Alpha Torque
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Description
OPTIBELT 6 AT3 / 639 AP 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 6 AT3 / 639 AP and any equivalents.
When you need to replace a timing belt, the marking on the back of the old belt is your most reliable reference. This page covers the Optibelt 6 AT3 / 639 AP from the Alpha Torque series, a timing belt with an AT3 profile, a 639 mm length, and a 3 mm pitch. Use those markings to confirm you are specifying the same belt.
The Optibelt 6 AT3 / 639 AP is a timing belt in the Alpha Torque series. Its profile is AT3, its length is 639 mm, and its pitch is 3 mm. These three values, profile, length, and pitch, are what you match when reading the old belt. If your current belt is marked 6 AT3 / 639 AP, this is the correct replacement.
If the marking is worn or unreadable, measure the old belt and note the profile and length. The AT3 profile and 639 mm length are the key identifiers. We carry the Optibelt 6 AT3 / 639 AP and can help you confirm it is the right belt for your drive. Send the part number and any photos of the old marking for a prompt quote.
Dimensions
- Profile
- AT3
- Pitch
- 3mm
- Length
- 639mm
Frequently asked questions
- What should I look for on the old belt?
- Check the back of the belt for the part number. For this belt, you are looking for 6 AT3 / 639 AP. The AT3 indicates the profile, and 639 indicates the length in millimeters. The pitch is 3 mm.
- Can you help if the marking is unreadable?
- Yes. Send us the part number if you have it, or the profile, length, and pitch you measure from the old belt. We will confirm whether the Optibelt 6 AT3 / 639 AP matches your application.
- How do I request a quote?
- Send the part number 6 AT3 / 639 AP by WhatsApp or email. Our team replies promptly and can confirm the belt or suggest an equivalent if needed.

