t6slotT-slot aluminum is used for a wide variety of framing applications. T-slots are structural aluminum extrusions that permit modular construction and can be used to construct any imaginableEngineering 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