Overview
ISO 9312:2013 covers insulated pins used to pin parts in the secondary circuit of resistance welding equipment or other live equipment that must be insulated from each other. This second edition (2013) is a minor revision of the original 1990 publication and provides clear requirements for designation, material selection, dimensions and finishing to ensure safe, repeatable use in electrode back-ups.
The standard is practical and concise: dimensions are given by figure and table references, materials are specified by reference to established insulating laminate types, and tolerances follow general ISO guidance.
Key Topics
- Scope and applicability: Pins intended for the secondary circuit of resistance welding equipment or other live assemblies that require electrical insulation between parts.
- Designation: A clear naming convention is specified. Example: "Fiche isolée ISO 9312 - 8" designates an insulated pin with diameter d = 8 mm.
- Materials: Insulating materials must be rigid fabric laminates in accordance with IEC/CEI 60893-3-4 (PF CC 201 or PF CC 202), providing electrical insulation and mechanical stability.
- Dimensions: Standard dimensions are provided in Figure 1 and Table 1. Typical standardized diameters and associated lengths include:
- d = 6 mm → l = 30 mm
- d = 8 mm → l = 40 mm
- d = 10 mm → l = 50 mm
- d = 12 mm → l = 60 mm
(Table 1 also includes associated detail dimensions such as fillet radii and shoulder lengths.)
- Finishing and tolerances: Dimensional tolerances for unspecified features follow ISO 2768-1 class "moyenne" (ISO 2768-m). Surface state indications refer to ISO 1302 where applicable.
Applications
ISO 9312:2013 is intended to support manufacturers, machine builders, procurement specialists and maintenance personnel involved with resistance welding equipment. Practical uses include:
- Standardizing electrode back-up components to ensure interchangeability and safe electrical isolation.
- Specifying material and dimensional requirements for procurement and quality control.
- Guiding maintenance and replacement of insulated pins used in production welding cells.
Benefits include improved safety, consistent assembly performance, simplified inventory management and clearer supplier specifications.
Related Standards
The standard references and aligns with several international documents that are important for implementation:
- ISO 2768-1 - General tolerances for linear and angular dimensions (class ISO 2768-m)
- ISO 5827 - Resistance welding machines - lower equipment and clamping assemblies (application example)
- IEC/CEI 60893-3-4 - Insulating laminates (PF CC 201 / PF CC 202 material specifications)
- ISO 1302 - Indication of surface texture in technical product documentation
Use ISO 9312:2013 as a concise technical reference when specifying insulated pins for electrode back-ups to ensure conformity, safety and compatibility in resistance welding systems.