Overview - ISO 8843:2005 (Aircraft crimp-removable contacts identification system)
ISO 8843:2005 specifies a standardized identification system for crimp‑removable contacts used in aircraft electrical connectors. The system uses colour bands (and, for thermocouple or high‑temperature contacts, additional letters or colour points) applied to the external diameter of the crimp barrel to identify contact mating size and the conductor sections the crimp accepts. The standard is intended for ISO standard contacts and is recommended for both preferred and non‑preferred contact types.
Key topics and technical requirements
- Two colour bands: nominal width 1 mm each.
- Band No. 1 identifies the contact active (mating) size and indicates the insertion/extraction tool and crimping locator to use.
- Band No. 2 identifies the range of conductor cross‑sectional areas accommodated by the crimp barrel.
- Single band alternative: preferred‑type contacts may be marked with a single band (min. 1 mm) when both characteristics are the same.
- Thermocouple identification: either a letter code placed forward of the retention device (CR, AL, FE, CN) or a colour point indicating thermocouple type.
- High‑temperature contacts: identified by a colour point (e.g., 260 °C class indicated in the standard).
- Manufacturer marking: contacts must also carry a manufacturer identifier in a non‑active area.
- Colour reference: colours used shall comply with IEC 60062 requirements.
- Scope notes: the system does not preclude additional markings for parameters such as cable size or material. Table mappings (colour ↔ contact size / AWG / mm²) are provided in the standard.
Practical applications and users
ISO 8843:2005 is useful for:
- Aircraft and aerospace manufacturers specifying connector and contact identification for wiring harnesses.
- Electrical connector and contact manufacturers implementing consistent marking schemes.
- Harness assemblers and crimping technicians selecting correct tools, crimp locators and wire sizes.
- Maintenance, inspection and avionics engineers for rapid identification during troubleshooting and repair.
- Procurement and quality assurance to verify correct contact selection and traceability in the supply chain.
Benefits include reduced assembly errors, faster maintenance, clear identification of thermocouple and high‑temperature contacts, and compatibility across suppliers.
Related standards
- ISO 2635 - conductor dimensions and characteristics for aircraft electrical cables (referenced for conductor section data).
- IEC 60062 - colour codes and marking requirements for electronic components (used as the colour specification reference).
Keywords: ISO 8843:2005, crimp‑removable contacts, electrical connectors, aircraft contact identification, colour bands, thermocouple contacts, high‑temperature contacts, wire gauge, crimp barrel.