'ACME' is often a phrase that refers to a particular thread variety. All ACME screws also are lead screws but not all lead screws are ACME screws. The ACME thread standard is accompanied by unique courses like 2G, 3G, 2C etcetera. The number of types of screws are there? Though https://typesoflogsiding73951.newsbloger.com/29900826/examine-this-report-on-what-is-lead-in-lead-screw