tslot

A T-slot is a machined groove used on machine tool tables, jigs, fixtures, and extrusion profiles. The cross-section forms a T shape: a wider top opening that accepts a T-nut, and a narrower stem that carries the nut into the deeper part of the slot. This configuration lets a bolt tighten against the nut and clamp a workpiece.

In traditional machine tables, T-slots are cut into a flat surface and then milled to form the T-shape, typically using cast iron or steel tables. In modular aluminum extrusion systems, the T-slot is built into the profile, with a slot and a matching T-nut that slides along the groove.

Applications include securing workpieces for milling, drilling, or assembly; mounting vises, clamps, stops, and fixtures; and assembling modular fixtures for automation. Accessory hardware includes T-slot nuts, bolts, clamps, and special fasteners designed to operate within the slot. To install: slide a T-nut into the slot, position the clamp or workpiece, then tighten the bolt to pull the nut into a secure engagement against the slot walls.

Slot dimensions vary by manufacturer and standard, so compatible hardware must be used. Users should inspect for burrs or wear, avoid overtightening, and regularly maintain the slot to preserve clamping accuracy. T-slots provide rapid reconfiguration, repeatable positioning, and versatile mounting for fixtures, jigs, and automation installations.