ISO 8430-2:2016

Overview

ISO 8430-2:2016 - Resistance spot welding - Electrode holders - Part 2: Morse taper fixing - specifies the dimensions, tolerances and designation rules for a class of resistance spot welding electrode holders (type B) that are non‑offset, include provisions for cable clamping, and use a male Morse taper to fix the holder directly to the welding cylinder in multipoint welding equipment. This second edition (2016) replaces the 1988 edition and updates material references and drawing style.

Key topics and technical requirements

• Scope and type: Applies to type B electrode holders without offset, intended for multiple spot welding systems with direct fixation to a welding cylinder via a male Morse taper (Figure 1 shows Morse taper no. 3 as an example).
• Dimensions and tolerances: Detailed in Figure 1 and Table 1 of the standard - reference diameters, total lengths, cooling tube interfaces and associated dimensional data are specified in millimetres.
• Designation and marking: A standardized designation format is required: description block, reference to ISO 8430-2, type (B), reference diameter, total length (l), and material (per ISO 5182). Example: Spot welding electrode holder ISO 8430-2‑B‑16 × 103‑A 2/1 Marking on parts uses the condensed form (e.g. B‑16 × 103‑A 2/1).
• Materials and insulation: Electrode holder materials shall comply with ISO 5182 (preferably group A, type 2). Insulation materials must be suitable for the application.
• Delivery and protection: Fixings shall be protected against damage during delivery (for example, by a synthetic resin coating).
• Surface finish: Surface roughness indications follow ISO 1302 where applicable.
• Compatibility: Interfaces and assemblies reference related components - electrode adaptors, cooling tubes, secondary cables and welding cylinders - to ensure interchangeability and correct assembly.

Applications and who uses this standard

• Manufacturers of electrode holders, adaptors and multipoint resistance welding equipment.
• Welding equipment designers and mechanical engineers specifying Morse taper interfaces and cooling/cable connections.
• Quality assurance, procurement, and maintenance teams ensuring interchangeability, fit and traceability of welding consumables and components.
• Test labs and certification bodies assessing dimensional conformity and marking.

Related standards (normative references)

• ISO 5182 - Materials for electrodes and ancillary equipment
• ISO 5183-1 - Electrode adaptors, male taper (conical fixing)
• ISO 1302 - Surface texture indication
• ISO 5821 / ISO 5822 / ISO 5828 - Electrode caps, taper gauges, secondary cables
• ISO 7285 - Pneumatic cylinders for mechanized multiple spot welding
• ISO 9313 - Cooling tubes

Using ISO 8430-2:2016 helps ensure mechanical compatibility, safer assembly, and standardized identification of Morse‑taper electrode holders in resistance spot welding systems.