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 same built height of type 10 000 to 95 000, pressurized with nitrogen with a nominal initial force of between 10 000 N ± 5 % and 95 000 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.