Application dependant. Rolled threads are WAAAAAY stronger, if done cold rolled, than a single pointed, stamped, or cast thread. The reason is that with rolled threads instead of cutting through longitudinal grains in the metal you end up rearranging them so that they make nice reinforcements for the actual threads sticking up from the minor diameter so that the shear strength is better. Instead of shearing along intergrain boundaries the shear failure has to cut across if that makes sense?Which is better and why? How much strength difference is there?
Rolling Threads Has Advantages : Modern Machine ShopHow exactly are rolled threads made?
I'm going to use the same system for my biplane wings, like many other designs; threaded rods passing throuigh the spars, secured and tensioned by nuts. Turnbuckle prices have reached insane levels and rods tend to require far less periodic adjustment, if any. I'll cut my own threads unless I can find a shop that will roll threads cheaply for me. Strength is dependent on whatever root diameter you're left with. I'll add a little diameter for peace of mind.I'm thinking male threads here. I'm considering the different approaches to drag/anti-drag wires inside a wing. Some use a turnbuckle system while others use a threaded rod going through the spar. I like the threaded rod going through the spar approach for simplicity but am unsure of the strength differences to adjust for. How exactly are rolled threads made?
Those are cool tools, but they only seem to be available in metric threads. Kind of pricey too. I'll have to look around and see if any come with standard sizes at a reasonable price.Why not just roll your own threads?
Thread repair, thread making & thread rolling with SilberTool hand tools
Never used one but they look interesting. May have to get one just to play with.
Different tool, but the same idea.
YouTube - CYCLO Tools Spoke Thread Rolling Machine