Hino 338 Turn Signal Bulb Size

The Hino 338 front turn signal bulb uses a 4157NA size bulb for this model. The replacement chart covers vehicle production spanning 2005 to 2014.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
2005-2014	4157NA

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	4157NA

The 4157NA is the specified front turn signal bulb for the Hino 338 across all listed model years, spanning 2005-2014.
The 4157NA follows the ANSI standard, meaning it conforms to a standardized specification recognized across the United States and Canada.
The bulb carries a T25 designation, which refers to its tubular glass envelope size, expressed in units of one-eighth of an inch.
The 4157NA is a dual-filament bulb, operating at 27W on its primary filament and 7W on its secondary filament, allowing it to serve both turn signal and parking light functions within a single housing.
The natural amber glass of the 4157NA produces its amber output through the color of the glass itself rather than through a coated or painted lens, which is the defining characteristic of the "NA" suffix in the bulb designation.
The bulb operates on a 12V electrical system, consistent with standard automotive voltage.
The 4157NA is not interchangeable with a standard 4157 bulb in applications requiring amber output from the bulb itself, since the non-NA variant uses clear glass and relies on an external amber lens to produce the correct signal color.