The TB Wood's 1VP65138 is a variable pitch sheave designed to accommodate 4L, 5L, A, B, and 5V belt sections, featuring a 1-3/8" bore and a 6-1/2" outside diameter. This sheave offers a range of pitch diameters, from 5.98" to 4.80" for 4L or A belts, and from 6.45" to 5.24" for 5L or B belts, providing flexibility in adjusting the speed ratio to meet specific operational requirements. The sheave's construction from fine grain, high tensile cast iron ensures durability and reliable performance in demanding industrial applications. Its design includes a 1 groove configuration, with a sheave thickness of 1-21/32" and a side groove thickness of 7/16", suitable for face widths ranging from 7/8" to 1-1/4". This versatility allows for compatibility with various belt types and sizes, making it a valuable component in belt drive systems that require precise speed adjustments and robust construction.