Timing belt Optibelt 300 / H 3940 AFX

OPTIBELT 300 / H 3940 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 300 / H 3940 AFX and any equivalents.

The Optibelt 300 / H 3940 AFX is an Alpha Flex timing belt with an H profile and a length of 10007.6 mm. It is a synchronous belt intended for drives where tooth engagement and length must match the original specification. Before fitting it, inspect the drive and sheaves so the new belt runs correctly.

Start with the sheaves. Check the tooth grooves for wear, buildup or damage, and confirm the sheave teeth match the H profile. A worn or mismatched sheave can shorten belt life even when the replacement is correct. Verify that the shafts are aligned and that the sheaves are secure before the belt is installed.

Measure the old belt and compare the marking on its back with the required part. The 300 / H 3940 AFX is identified by the H profile and the 10007.6 mm length. If the drive uses more than one belt, replace the set together so the load is shared evenly. After fitting, check tension and recheck alignment.

MR Industrial Accessories supplies this Optibelt Alpha Flex timing belt to maintenance, engineering and purchasing teams across the United States, Canada, Mexico and South America. Send the part number 300 / H 3940 AFX by WhatsApp or email to request a quote. If you need help confirming the belt or an equivalent, include the drive details with your message.