Home Products agricultural chain weld on sprockets hubs spline bore w series w series Hub Series A B C W 1-5/8" 1-13/16" 1-7/16" 3 Available Products SALE W11806P - Weld-On Hub 1-1/8" x 6 spline bore. ... SALE W13806P - Weld-On Hub 1-3/8" x 6 spline bore. ... SALE W13821P - Weld-On Hub 1-3/8" x 21 spline bore. ... 3 Available Products