Need a nut for 3/4” shaft

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I’m wondering if anyone could tell me what size nut I’d need to fit on a 3/4” threaded jackshaft, I’m custom ordering a 3/4” shaft but it needs specs to be right before I order

gonna do a 16” x 3/4” shaft, both ends threaded about 4-1/2” long with a 3/16” key way also 4-1/2” long but I’ll need to know what size nut to fit on for securing a driven pulley and I’m getting better but still not a pro at bolt/nut sizes
 
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