Clamping Workholding and Positioning - Milling M in the Machining category from GoVets is the perfect place to find the products you need to complete your project. Milling Machine T-Slot Nuts are used to secure a workpiece in place on a milling machine table. They are designed to fit into the slots on the table and are tightened with a screw or bolt to hold the workpiece in place. Shop today for the best selection of Milling Machine T-Slot Nuts and other Clamping Workholding and Positioning - Milling M products.