640-8M-50 DD Dunlop Double-Sided Timing Belt
- D8M
- 80 teeth
- 640mm pitch length
- 50mm wide
640-8M-50 DD Dunlop Double-Sided Timing Belt is backordered and will ship as soon as it is back in stock.
Measuring Your Belt
Measuring Your Belt
Check the markings first. Most belts have their size printed on the back, for example A24, SPZ1000 or 8PK1200. Type that code into the search bar to find the exact match.
Markings worn off? Measure across the top of the belt for the width, and its depth. For the length, wrap a piece of string round the belt, mark where it meets, then lay the string flat and measure it.
Timing or ribbed belt? Count the teeth or ribs, and measure the gap between them.
Full step-by-step guide: How to measure your belt →
Still not sure? Call 020 8138 2848 and we’ll identify it for you.
Delivery and Shipping
Delivery and Shipping
We ship across the UK and worldwide. Choose an economical service if you can wait a few days, or express if the machine is stood still until the belt arrives. Delivery costs are worked out at checkout based on the weight of your order and where it's going. More Shipping Information
640-8M-50 DD Dunlop Double-Sided Timing Belt
The Dunlop 640-8M-50 DD is a double-sided 8M HTD-profile timing belt with a 8mm pitch, a 640mm pitch length, 80 teeth on each side and a width of 50mm. It runs on standard HTD 8M pulleys from either face, so one belt can drive shafts turning in opposite directions.
Dunlop rubber timing belts are made of chloroprene rubber with a glass-fibre tension cord and nylon fabric on the teeth on both sides. They’re maintenance-free, keep exact timing with no slip, and are an economical choice for general industrial drives.
Specification
| Brand | Dunlop |
|---|---|
| Profile | D8M (double-sided) |
| Tooth pitch | 8mm |
| Pitch length | 640mm |
| Number of teeth | 80 each side |
| Width | 50mm |
| Construction | Chloroprene, glass-fibre cord, nylon facing |
Check it’s the right belt
- The old belt should be marked 640-8M-50 DD (or 640 8M 50). 640 is the pitch length in mm, 8M the profile and 50 the width in mm.
- If the marking has worn off, count the teeth on one side: this belt has 80. Multiply by 8mm to get the pitch length.
- Other brands mark this size D8M 640 50 or 640-D8M-50. They’re interchangeable.
Not quite the right size? The nearest sizes in this width are 632-8M-50 DD and 680-8M-50 DD. Not sure? Call 020 8138 2848 and we’ll help you find the right belt.
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Payment & Security
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