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V Belt Sizes And Codes

How To Read V-Belt Numbers. Automotive belts start with either 4L (12.5mm wide) or 3L (9.5mm). The number following it is the outside length of the belt in tenths of inches. The inside length of the belt is typically 2" less for a 4L belt, and 1-1/2” less for a 3L belt. An example would be 4L460, which would be 46" long outside, 44" inside.

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