BS ISO 3601-3:2005+A1:2018 defines the quality acceptance criteria of O-rings used in fluid systems, the dimensions of which are standardized in ISO 3601-1, ISO 16031-1 and ISO 16031-2. The ISO 3601 series of standards basically addresses O-rings with moulded cross-sections without a radial joint.Cross References:ISO 16031-2ISO 16031-1ISO 5598ISO 3601-1Incorporates the following:Amendment, December 2018