Overview
ISO 8694:2011 specifies the dimensional, material and marking requirements for shouldered ejector pins with a cylindrical head used in compression and injection moulds and in die-casting dies. This third edition is a minor revision of the 1998 edition and updates surface-texture indications in line with ISO 1302:2002. The standard ensures consistent interchangeability, improved durability and clear designation for tooling components.
Key Topics
- Scope and purpose: Defines dimensions and tolerances in millimetres for shouldered ejector pins used in mould tooling and die casting.
- Dimensions and tolerances: Dimensioning follows the indications given in the standard (see Figure 1 and Table 1). The standard covers key geometric parameters (D, D1, D2, L, H, R) and associated tolerances to ensure proper fit and function.
- Surface finish: Surface roughness recommendations are provided in the figure key. Typical guidance includes Ra 0.8 µm for hot-worked steel and Ra 0.4 µm for alloyed cold-worked steel, with allowances for alternate finishes or small diameter variations over defined lengths.
- Concentricity: A concentricity tolerance of 0.05 mm is specified and measured over a maximum distance of 10 mm immediately after the radius joining the shoulder diameters.
- Materials and hardness: The standard permits either hot-worked steel or alloyed cold-worked steel. Hardness requirements are indicated in the standard, with typical values including a minimum hardness for hot-worked/hot-forged material and specified HRC ranges for different material options. The point of hardness measurement is left to the manufacturer's discretion.
- Designation rules: Clear designation format is specified to standardize ordering and documentation.
Applications
ISO 8694:2011 is primarily used by:
- Toolmakers and mould designers specifying ejector pins for injection, compression and die-casting tooling
- Production engineers ensuring component interchangeability across dies and moulds
- Purchasing and quality teams requiring unambiguous designation and acceptance criteria
Benefits include:
- Interchangeability of ejector pins across compatible tooling
- Improved lifecycle and reliability through specified hardness and surface requirements
- Reduced ambiguity in procurement via a standardized designation format
Related Standards
Use ISO 8694:2011 when specifying shouldered ejector pins to align dimensions, surface finish, material and hardness with internationally accepted tooling practice, and to ensure clear, consistent designation in technical documentation and procurement.
