Overview
ISO 16915:2003 - Tools for moulding - Sprue pullers - defines the main dimensions, tolerances, material, hardness and designation for sprue pullers used primarily in injection moulds for plastics and rubbers. The standard specifies dimensions in millimetres, gives general tolerances, and includes an example application showing the sprue puller in a mould assembly. ISO 16915:2003 ensures interchangeability and consistent quality for sprue pullers used in moulding tools.
Key Topics
- Primary scope: Main dimensions and tolerances of sprue pullers for injection moulds (plastics and rubbers).
- Dimensions and fits: Detailed dimensional table and recommended fits are provided (with general tolerances per ISO 2768‑1, tolerance class m). Chamfering is left to the manufacturer’s discretion.
- Material: Sprue pullers shall be made from tool steel in accordance with ISO 4957.
- Hardness: Minimum hardness requirement is 50 HRC, ensuring wear resistance and durability in repeated moulding cycles.
- Designation and ordering: Standardized designation format (example):
- Sprue puller ISO 16915 - 12×50
This includes the reference to ISO 16915 and the sprue puller’s diameter (D) and length (l) in millimetres.
- Illustration and application: Example assembly in the standard shows the sprue puller interacting with ejector pins, sprue bushes and locating rings to clarify practical mounting.
Applications
Who uses ISO 16915:2003 and why:
- Toolmakers and mould designers: Select and specify correct sprue puller sizes and fits to ensure proper ejection and long service life.
- Plastics and rubber moulding manufacturers: Ensure component interchangeability across moulds and suppliers, reducing downtime and simplifying maintenance.
- Procurement and quality engineers: Use the designation and material/hardness requirements for supplier specifications, incoming inspection and traceability.
- Maintenance teams: Replace worn sprue pullers with correctly specified parts to maintain mould performance.
Practical benefits:
- Improved compatibility between mould components (sprue bush, locating rings, ejector system)
- Predictable wear characteristics due to specified material and minimum hardness
- Streamlined ordering and inventory through a standardized designation format
Related Standards
Keywords: ISO 16915:2003, sprue pullers, tools for moulding, injection moulds, dimensions, tolerances, tool steel, 50 HRC, mould design.
