Article C5.4.11
Piston pin diameter
Technical Regulations
Article C5.4.11
Piston pin diameter
Chapter: C5
In Simple Terms
The piston pin is a small metal rod that connects the piston to the connecting rod inside an F1 engine. The regulation specifies that this pin must have a diameter between 18.0 and 19.0mm to ensure consistency and prevent unfair performance advantages across all teams.
- Piston pin diameter must be between 18.0mm and 19.0mm
- The piston pin connects the piston to the connecting rod
- This specification ensures all teams use similar engine components
- Compliance is checked during technical inspections
Official FIA Text
The piston pin diameter must lie between 18.0 and 19.0mm.
piston pindiameterengine componenttechnical regulationsf1 engine
2026 Season Regulations