The 6.5-4-1891-1 yoke is part of the 1810 series, designed for heavy-duty applications. It features a spline count of 16 and a spline diameter of 2.350 inches. The hub diameter measures 2.875 inches, with a through hole of 2.750 inches. The centerline to end distance is 5.500 inches. This yoke comes in an HR style and is manufactured by Spicer, ensuring reliability in demanding conditions.