What is rkm in yarn?

RKM is the short expression for “Reisskilometer” – “Breaking-kilometer”, which is an unit out of date. how to calculate rkm of yarn ? Best Answer This can be expressed by the “Length of yarn in km” at which yarn will break of its own weight”. RKM & Minimum RKM in yarn - Spinning - Ramakant Dubey Textile Technoz. Export Yarns: Practically all European countries except U. RKM = Tenacity (CN/tex) X 1.