This part of ISO 11901 specifies the dimensions (in millimetres), nominal initial forces and types of gas springs.It is applicable to gas springs with increased spring force and compact built height of type 1 700 to 200 000, pressurized with nitrogen with a nominal initial force of between 1 700 N ± 5 % and 200 000 N ± 5 %, for use in press tools.It also specifies marking, technical delivery conditions and designation.NOTE Specifications of mounting accessories for gas springs are given in ISO 11901-2.