Sain Smart T-nuts

Just a quick share as the T-nuts and clamps that come with the Sain Smart 3018-Pro are ok and functional, but only just. First though, notice that I’ve turned the height adjusting bolt upside-down. My basic idea was to use the head of the countersunk bolt to increase the area and so reduce the damage to the table.

These clamps though don’t have T-nuts as they are just using the hexagon head of an M6 bolt. My issue is the head will over time damage the underside of the grooves and make placement more difficult. Also, the heads don’t sit that well on the underside of the groove.

My thought is to make 4 T-nuts with M6 threads and maybe some nice wing nuts.

machining square section from 3/4 inch mild steel

I didn’t have any 14mm square material in steel or brass in the box and so had to go for mild steel 3/4 inch round bar.

Setup in the bottom of the machine vice and machining 2.25mm down from each surface.

I use an engineers square to set the first machined face at right angles to the table and then machine the next face.

square to one edge
square section from round section

Hence I soon get to a square bar.

After a bit more machining and tapping I end up with six T-nuts.

six 6mm thread T-nuts

The T-nuts are 14.4mm across, the square nut is 6mm high and has an 8mm diameter boss protruding 2mm from the top. The nut is threaded 6x1mm. They are threaded the whole way through the nut.

mild steel T-nut

The nuts fit into the extrusion with a small amount of play.

blackened T-nuts

The final task was to chemically blacken the T-nuts. This can make them go slightly rusty and so I just dry them thoroughly and then apply a small amount of furniture wax.

The final image shows the Sain Smart T-nuts in use.

T-nut clamp

2 thoughts on “Sain Smart T-nuts”

    • Hi Dave, just a quick look and a piece of 1/4″ x 1/2″ mild steel will go into the T-slot. A 12″ length would be easy as you could cut it into 1″ lengths or even 1/2″ and then drill and tap 6mm – EKP is a good online store for buying this type of material. Just a thought, but if you made them 1″ long you could tap them 6mm at one end and 4mm at the other. Would give you some scope for different fixings. Best regards, Nigel


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