The standard applies to steel cable sockets for general use. The standard does not automatically apply to steel cable socks that are used under extreme conditions such as high or low temperatures and chemical influences and that are attached to steel cables that are used with a very low usage factor. In this situation, adjustments to the material and/or design should be considered.
NEN 2729-1989 history
1989NEN 2729-1989 Sockets for steel wire ropes (new series)