Just putting this up to show how simple it is to make adequate light-duty T-nuts quickly – in fact just using an entire coach bolt of close suitable size. A small reduction in head diameter on two opposite sides fits the T-slot base width – and then often the square under the head fits into the t-slot top width, if same as main thread dia. May not be necessary to machine the domed head if it fits already. This example was modifying bolts to suit a mini 4″ rotary table. Quick and adequate!
( www.oldmansshop.com/ )
With a less cold shop, we tackled this small task. Don’t laugh — it’s only a humble nut! Needed a particular size to suit an old UK thread (3/8″ x 20 TPI BSF). The process, for something so simple, is a bit tedious due to the several stages. The ‘quick fix’ is to find a nut close enough in size, and drill it out and tap it! Here we did the slow way, working from solid with a piece of 3/4″ hex, which happened to be pretty hard material. Oh for CNC!