If it says it is ( hand quilting) thread it should not be used in a machine, those have a wax coating. If it is simply a heavy weight thread it is OK to use. Is there any weight info on the spool ends? It might just be heavy, strong, utility thread. Often used to stitch heavy projects ( Denim jeans....) As long as it is not waxed it is fine to use in your machine for whatever you want to use it for.