This document specifies the dimensions, in millimetres, nominal initial forces and type of gas springs. It applies to gas springs of type 900 to 100 000, pressurized with nitrogen with a nominal initial force of between 900 N ± 5 % and 100 600 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.