The INFINITI M35h uses a 7440NA bulb size for both front and rear turn signal applications. Replacement chart data covers 2012 to 2013 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440NA is the sole bulb type listed across all turn signal positions on the INFINITI M35h for the 2012-2013 model years.
The 7440NA is a single-filament wedge bulb built to the T20 form factor, operating at 12 volts and rated at 21 watts.
The "NA" suffix in the 7440NA designation denotes natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-tinted lens or housing.
The 7440NA conforms to ANSI standards as applicable in the United States and Canada, indicating it meets the photometric and dimensional requirements set by that standardization body for the North American market.
Because the 7440NA is a single-filament bulb, it serves a dedicated switching function and is not shared with a braking or running light circuit within the same bulb.
The front and rear turn signal positions on the M35h use the identical 7440NA specification for both covered model years, meaning the same bulb type is interchangeable across all four turn signal sockets on the vehicle.
The T20 wedge base of the 7440NA is not compatible with bayonet-style or pin-type sockets, so substitution with physically similar but differently based bulbs would result in a fitment mismatch.
The standard 7440, which shares the same T20 wedge base and 21-watt rating, uses a clear glass envelope rather than natural amber glass. Installing a clear 7440 in place of the 7440NA would alter the emitted light color unless the housing itself provides amber filtration.