Overview
ISO 11900-2:2008 - Tools for pressing: Ball-lock punch retainers - Part 2: Types C and D, reduced for light duty - specifies the detailed dimensions, tolerances and basic material/hardness guidance for reduced ball‑lock punch retainers (types C and D) and their backing plugs used in light‑duty punching of steel sheets. The standard’s primary purpose is to ensure interchangeability and reliable retention of ball‑lock punches used in accordance with ISO 10071-1.
Key topics and requirements
- Scope: Dimensions and tolerances in millimetres for reduced ball‑lock retainers (type C and D) and backing plugs for light‑duty applications. Main use is retention of ball‑lock punches when punching holes in steel sheets.
- Dimensional data: Exact sizes and forms are given in the standard’s figures and tables for each nominal diameter and type. (See ISO 11900-2 for the full dimension tables and drawings.)
- General tolerance: For dimensions not individually toleranced the general tolerance is ±0.25 mm.
- Material and hardness: Material choice is by the manufacturer; recommended hardness is 46 ± 3 HRC for ball‑lock punch retainers and 55 ± 5 HRC for backing plugs.
- Functional features: Provision for dowel‑pin holes (per ISO 8735), counterbores for fastening (per ISO 273) and screw heads (per ISO 4762) are specified or referenced.
- Designation format: Retainers are designated with the format: “Ball‑lock retainer ISO 11900‑2 - [Type] - [Diameter]” (example: Ball‑lock retainer ISO 11900‑2 - C - 10).
- Normative references: The standard references ISO 10071-1 (ball‑lock punches), ISO 8735, ISO 273 and ISO 4762 among others.
Applications
- Standardizes components used in light‑duty press tooling for sheet metal punching operations.
- Ensures interchangeability of ball‑lock punch retainers in:
- Sheet metal fabrication and stamping shops
- Toolmaking and die‑making workshops
- Maintenance and procurement of press tool components
- Useful where precision retention of ball‑lock punches is required for accurate hole punching in steel sheets.
Who should use this standard
- Toolmakers, die designers and press tool engineers specifying punch retention components.
- Production engineers and maintenance technicians in stamping and metal‑forming industries.
- Purchasing/specification teams procuring replacement retainers and backing plugs.
- Quality and inspection personnel validating tolerances and hardness of retainers.
Related standards
Keywords: ISO 11900-2, ball-lock punch retainers, types C and D, reduced for light duty, dimensions, tolerances, backing plug, hardness, ISO 10071-1, press tooling, sheet metal punching.