The TB Wood's 3V4121 is a Narrow (Ultra-V) single groove sheave designed for 3V section V-belts, featuring a 4.12" outside diameter and a 0.69" face width. Constructed from fine grain, high tensile cast iron, this sheave ensures maximum performance and longevity. It utilizes a Sure-Grip‚ Quick Detachable (QD) bushing system, allowing for easy installation and removal without the need for special tools. The sheave accommodates bore diameters ranging from 1/2" to 1-5/8" and is suitable for use with 8V/8VX cross-section V-belts. Its precision engineering minimizes vibration and ensures smooth operation, making it ideal for applications requiring reliable power transmission. The 3V4121 sheave is part of TB Wood's extensive range of sheaves and V-belt drives, all engineered for durability and efficiency.