There are SMA connectors to fit RG-58 (RG-141 in teflon) and maybe RG-223 (RG-142) double shielded coax. That's the fundamental size of SMA. The original SMA males actually used UT-141 rigid .141 coax for the center and shield contacts. The "connector" consisted only of a ring and nut. 73, Jerry, K0CQ