t6slotEngineering 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-SlotsChoose from our selection of T-slots, including T-slotted framing rails, T-slotted framing structural brackets, and more. Same and Next Day Delivery.