![]() A flat washer for a 25.4 mm bolt with an outside diameter of 63.5 mm (2.5") works well with standard step blocks. The washer assures stability of the block when it straddles a T-slot. When using a clamp setup consisting of a clamp with one end resting on a standard 25.4-mm-thick step block, employing a large-diameter flat washer under the step block is convenient. Step blocks are available with thicknesses of 25.4 mm (1"), 38.1 mm (1.5") or 50.8 mm (2"). T-slot nuts are applied with studs of varying length or T-slot bolts of varying length with clamps and step blocks to set the clamp at the appropriate height for the workpiece. The clamps are different lengths and are used with riser blocks that have steps to allow the clamps to be positioned at assorted heights from the machine table surface. Standard sets include studs of various lengths with special nuts that fit into milling machine table T-slots and heavy-duty hex nuts to hold down the associated clamps. These clamps generally are used to clamp a workpiece to a machine table for machining. Besides clamping, these clamps can be used to set up work stops and fixturing, which I’ll get to in this article. T-slot clamps are tried-and-true accessories for milling applications - so much so that if you have a milling machine, chances are that you have a set of T-slot clamps.
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