DIN 3861:2016 is Non-soldering compression fittings - Compression rings - Design standard.
It is assembly with compression union nut DIN 3870, connect to ISO 8434-1 24 deg cone connector ends(same to DIN 2353 standard).
Cutting ring dimension drawings as follows:
Types_schneidring_DIN_3861_cutting_ring
Dimensions_DIN_3861_compression_ring
