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Belt type 5mm section V-belts

5mm wide · 3mm deep · Optibelt quality

5mm section belts are the smallest classical V-belts, made for light-duty drives where space is tight, such as small machine tools, sewing and textile machines, office and laboratory equipment, and hobby and model machinery. These belts are made by Optibelt, our premier brand, for smooth, quiet running and long life. Search by the size on the old belt, or use the filters to narrow it down by length.

Finding the right 5mm belt

Reading the sizeA size like 5 x 500 Li means a 5mm section belt with a 500mm inside length. Some sizes are given as the datum length (Ld) instead, which is a little longer, so check which one your belt shows.

Measuring a small beltIf the size has worn off, wrap a piece of string round the inside of the belt, mark it and measure the string. That gives you the inside length.

Check the sectionMeasure the top width and depth. A 5mm section belt is 5mm wide and 3mm deep. If yours is wider, see our 6mm and 8mm sections, or Z section at 10mm.

Tip: if a small belt stretches or slips quickly, check the pulleys for wear and the tension. A worn pulley groove will wear out a new belt fast.
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