There are many national standards regarding V-belts.
"Classical V-belt for general drive" (GB/T 1171-2006) was implemented on June 1, 2007, replacing GB/T 1171-1996.
"Narrow V-belt for general drive" (GB/T 12730-2008) was implemented on September 1, 2008, replacing GB/T 12730-2002.
"Belt drives - Classical and narrow V-belts - Dimensions (system based on datum width)" (GB/T 11544-2012) "Belt drives - Classical and narrow V-belts - Dimensions (system based on datum width)" was implemented in 2012.
Classical and narrow V-belt drives - Part 1: System based on datum width was implemented on March 1, 2009, replacing GB/T 13575.1-1992.
"Classical and narrow V-belt drives - Part 2: Effective system" (GB/T 13575.2-2008) was implemented on March 1, 2009.
"Variable-speed V-belts for agricultural machinery" (GB/T 14829-2007) was implemented on June 1, 2008, replacing GB/T 14829-1993.
The "Variable-speed-changers wide V-belts for industry" (GB/T 15327-2007) was implemented on June 1, 2008, replacing GB/T 12733-1994 and GB/T 15327-1994.
"V-belt and V-ribbed belt for agricultural machines - Dimensions" was implemented on February 1, 2009, replacing GB/T 10821-1993.
Automotive V-belts (GB 12732-2008) were implemented on October 1, 2008, replacing GB 12732-1996.
Fire-resistant V-belts (GB 12731-2014) were implemented on July 1, 2015 to replace GB 12731-2003.