
Timing belt Optibelt 25 / 5M 4000 AFX
- Brand
- OPTIBELT
- Category
- Power transmission
- Subcategory
- Timing belts
- Series
- Alpha Flex
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Description
OPTIBELT 25 / 5M 4000 AFX 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 25 / 5M 4000 AFX and any equivalents.
This Optibelt Alpha Flex timing belt is identified by the code 25 / 5M 4000 AFX. It has an HTD 5M profile, a 4000 mm length and a 5 mm pitch. Use these three values to confirm fit before ordering.
Timing belts in this profile are common on drives where the belt must mesh with a toothed pulley and maintain synchronization. Because the belt is defined by profile, length and pitch, the most reliable way to confirm a match is to read the marking on the back of the belt you are replacing and compare it directly to 25 / 5M 4000 AFX.
If the old marking is worn or missing, measure the belt length and count the teeth, then compare the profile to an HTD 5M pulley. A belt with the correct profile but the wrong length will not tension correctly. When you request a quote, send the part number and, if possible, a photo of the old belt marking.
We carry the Optibelt Alpha Flex line and can help confirm the right belt or suggest an equivalent. Provide the part number 25 / 5M 4000 AFX, the application details, and the pulley tooth count so we can check the profile and length against your drive.
Dimensions
- Profile
- HTD 5M
- Pitch
- 5mm
- Length
- 4000mm
Frequently asked questions
- How do I confirm that this belt fits my drive?
- Read the marking on the back of the belt you are replacing. It should show the profile, length and pitch. Compare those to HTD 5M, 4000 mm and 5 mm pitch. If the marking is unreadable, measure the length and check the pulley profile.
- What information should I send with my quote request?
- Send the part number 25 / 5M 4000 AFX and, if possible, a photo of the old belt marking. Include the pulley tooth count and the drive application so we can help confirm the profile and length.
- Can you help if I am not sure about the profile?
- Yes. Send the old belt marking or a photo, along with the pulley details. We can help confirm whether the HTD 5M profile and 4000 mm length match your drive, or suggest an equivalent.

