>>1831787>>1831776Shimano "6/7/8" speed hg-71 chain is 7.3mm (7 speed size according to that chart). SRAM 8-speed-only pc-850 chain is 7.1mm (though often sold as 6/7/8 by third party sellers). Also SRAM sells a separate 7 speed quicklink because its 7.1mm 8 speed one is slightly too tight for shimano 6/7/8 speed chains.
https://www.sram.com/en/sram/models/cn-850-a1