Aftermarket Classical V-Belt A23.5 Replacement 1/2" X 25-1/2" Belt 5/16" DepthOne New Aftermarket Replacement Classical V Belt A23. 5 1 2" x 25 1 2" This A section classical V belt is a standard industrial power transmission belt used in a wide range of agricultural, lawn and garden, and general purpose drive applications. The trapezoidal A section profile seats firmly into matching sheave grooves, with a 40 degree wedge angle that increases grip as load increases. Commonly used as a drive belt in tillers, walk behind mowers,