The INFINITI M35 front and rear turn signal bulbs both utilize a 7440NA bulb size. The replacement chart covers vehicle production spanning 2006 to 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Infiniti M35 uses the 7440NA bulb for both the front and rear turn signals across the 2006-2010 model years.
The 7440NA is a single-filament wedge bulb built to the T20 form factor, rated at 12 volts and 21 watts.
The "NA" suffix in the 7440NA designation indicates natural amber glass, meaning the amber color comes from the glass envelope itself rather than from a tinted lens or coating.
The 7440NA conforms to ANSI standards, making it a regulated specification recognized across the United States and Canada.
A single-filament design means the 7440NA serves one lighting function per socket, which is consistent with its dedicated turn signal application in the Infiniti M35.
The T20 wedge base requires no locking tabs or bayonet pins for retention, as the wedge-style base is held in place by friction within the socket.
The standard 7440 bulb uses a clear glass envelope, so the 7440NA is not a direct interchangeable substitute in applications where the housing relies on a clear bulb to produce amber light through a colored lens.
At 21 watts, the 7440NA falls within the typical power range for automotive turn signal bulbs, which is relevant when considering compatibility with a vehicle's turn signal flasher relay, as relay timing is often calibrated to a specific load.