Editing Screw thread (section)

===ISO standard threads===
{{Main|ISO metric screw thread}}

The most common threads in use are the [[ISO metric screw thread]]s (M) for most purposes, and [[British standard pipe thread|BSP threads]] (R, G) for pipes.

These were standardized by the [[International Organization for Standardization]] (ISO) in 1947. Although metric threads were mostly unified in 1898 by the International Congress for the standardization of screw threads, separate metric thread standards were used in France, Germany, and Japan, and the Swiss had a set of threads for watches.