Overview
ISO 12667:1993 defines the nominal dimensions and tolerances that affect interchangeability of type T cross-tooth propeller shaft flanges used on commercial vehicles and buses. The standard establishes clear rules for designation, dimensioning and surface requirements to support consistent manufacturing, maintenance and spare-part interchangeability across suppliers and vehicle builders.
Key points from the standard include: figures and tables that show the nominal dimensions and tolerances that affect interchangeability, reference to mating-part requirements in ISO 8667, and a prescribed designation format (for example: ISO 12667 - T 150). Dimensions are given in millimetres and surface roughness values in micrometres. The document also references related technical drawing guidance such as ISO 13715.
Key Topics
- Nominal dimensions and tolerances: Defines the dimensional parameters and tolerance limits that determine interchangeability of type T propeller shaft flanges.
- Designation: Specifies how flanges conforming to the standard shall be identified (reference to ISO 12667, type code T and size d).
- Reference to mating parts: Mating gearbox flange dimensions and tolerances are specified separately in ISO 8667, ensuring both sides of the joint are standardized.
- Manufacturing and inspection cues: Figures and tables in the standard include guidance on surface roughness and permissible pitch errors to support quality control.
Applications
ISO 12667:1993 is intended for use by:
- Vehicle manufacturers and suppliers producing drive-shaft components for commercial vehicles and buses.
- Maintenance and overhaul facilities that require standardized spare parts to ensure proper fit and safe operation.
- Procurement and quality teams who need a clear, internationally recognized basis for specifying flange interchangeability.
Benefits of applying the standard:
- Interchangeability between flanges from different manufacturers, reducing stocking complexity.
- Improved safety and reliability through consistent dimensional and surface-quality requirements.
- Streamlined procurement by using a recognized designation format and referenced specifications.
Related Standards
- ISO 8667 - Cross-tooth gearbox flanges, type T (mating parts dimensions and tolerances).
- ISO 13715 - Technical drawings - corners and indication on drawings (referenced for drawing practices).
Applying ISO 12667:1993 helps ensure that propeller shaft flanges meet internationally accepted dimensional and tolerance criteria, enabling interchangeable, reliable drive-shaft connections on commercial vehicles and buses while simplifying supplier and maintenance workflows.