t6slotAluminum 6063 T-slot Extrusions offer several advantages over other materials such as steel or ey are lhtweht, durable, and resistant to corrosion, making them ideal for use inEngineering Hardware Standards. Dimension Table for T-Slots, Bolts, and Nuts per. American National Standard T-Slots ANSIASME B5.1M-1985. 1. Width of tongue used with the T-Slots