Source for longer ACME rod

Is there a source for a longer ACME screw rod? I’m planning on increasing the Z-travel as much as I can (within reason). They have it in different materials and lengths.

SDP and Roton both have them. The specsheet says 3/8-12, 2G fit. SDP are that grade, I didn’t look at Roton.

Thanks for the useful responses. I have access to a lathe so I guess I’ll have to turn down the end of the rod to fit into the bearing and add the M6 thread myself (?)

We prototyped the design with a female thread because it was easier for us on a small lathe. We just drilled and tapped the end. We switched to a male thread because it is faster on a production machine.