ISO 8694:2011

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

• ISO 1302:2002 - referenced for surface-texture indication updates
• ISO 6751 - ejector pins with cylindrical head
• ISO 8693 - flat ejector pins

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.