BS ISO 2861:2020 pdf free.Vacuum technology - Dimensions of clamped-type quick-release couplings. BS ISO 2861 This document specifies the dimensions of the clamped-type quick-release couplings used in vacuum technology, as well as those of the O-rings and their carriers associated with these couplings, used to ensure vacuum tightness. NOTE The dimensions retained for the coupling diameter ensure the compatibility of...