ISO 11901-2:2018

Overview

ISO 11901-2:2018 - Tools for pressing - Gas springs - Part 2: Specification of accessories defines standardized mounting accessories for gas springs used in press tooling. The document specifies all relevant dimensions in millimetres, material guidance and a designation system for mounting base plates, two-part mounting clamps, flange mounts, front end supports and rectangular flange mounts intended to be used with gas springs covered by ISO 11901‑1, ISO 11901‑3 and ISO 11901‑4.

Key topics and requirements

• Dimensions and tolerances: All sizes are given in millimetres with general tolerances class m (ISO 2768‑1). Certain fits use tolerance grade h10 where indicated. Detailed figures and tables provide dimensional data for each accessory type.
• Accessory types: The standard covers:
  • Type A - Mounting base plates (A1 two‑hole, A2 four‑hole)
  • Type B - Two‑part mounting clamps
  • Type C - Flange mounts (C1 cylindrical, C2 square)
  • Type D - Front end supports (D1, D2)
  • Type E - Rectangular flange mounts
• Size range: Tables include dimensions for gas spring cylinder diameters commonly used in press tooling (from small sizes up to larger cylinders shown in the tables, e.g., nominal diameters in the ISO series).
• Material: Recommended material is steel E 355 C (per ISO 630‑1) or an equivalent material with comparable mechanical characteristics.
• Designation rules: A clear naming convention is specified (e.g., “Mounting base plate ISO 11901‑2 – A1 – 50” for an A1 plate for a 50 mm cylinder).

Applications and users

ISO 11901-2:2018 is practical for:

• Tooling designers and press tool engineers specifying gas spring mounts for dies and punches.
• Gas spring and accessory manufacturers ensuring interchangeability and conformity.
• OEMs, maintenance teams and procurement specialists who require standardized mounting hardware to simplify spare parts and reduce downtime.
• CAD/model libraries and component suppliers that need precise dimensional data for part modeling and BOMs.

Benefits include improved interoperability of gas springs and mounts, easier supplier communication, and reduced redesign risk when replacing components.

Related standards

• ISO 11901‑1 - General specifications for gas springs (series parent)
• ISO 11901‑3 and ISO 11901‑4 - Gas springs with increased spring force / compact heights
• ISO 630‑1 - Structural steels (material reference)
• ISO 2768‑1 - General tolerances for linear and angular dimensions

Keywords: ISO 11901-2:2018, gas springs, mounting accessories, flange mounts, mounting base plates, two-part mounting clamps, front end supports, press tooling, dimensions in millimetres.