International HX520 Back Up Light Bulb Size

The International HX520 back up light requires a 3157 bulb size for proper installation and function. Data for the specified lighting component covers the range from 2018 to 2019.

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

Bulb Size by Year Range

Years	Bulb Size
2018-2019	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The 3157 is the specified back up light bulb size for the International HX520 across the 2018-2019 model years.
The 3157 bulb follows the ANSI standard, which governs its electrical and physical specifications for use in the United States and Canada.
As a dual-filament bulb, the 3157 carries two separate filaments within a single housing, operating at 27W on the high-filament circuit and 7W on the low-filament circuit.
The 3157 is a T25 wedge-type bulb, meaning it uses a plastic wedge base rather than a metal bayonet or screw base for socket retention.
The bulb operates on a 12-volt electrical system, consistent with standard automotive DC voltage.
The T25 designation refers to the bulb's body shape classification, with the numeric portion indicating the body width in eighths of an inch.
Because the 3157 is a dual-filament type, single-filament substitutes such as the 3156 are not interchangeable without functional loss, as the 3156 omits the secondary filament circuit entirely.