The Nissan 620 Pickup uses an H5001 bulb size for high beam headlights and an H5006 bulb size for low beam headlights. The replacement chart covers 1972 to 1974 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Nissan 620 Pickup uses the H5001 sealed beam unit for high beam headlights across the 1972-1974 model years.
The H5001 is a 4-inch square sealed beam unit operating at 12V, conforming to ANSI standards for the US and Canadian markets.
Low beam headlights on the 1972-1974 620 Pickup use the H5006 sealed beam unit, which is a 5.75-inch round format also rated at 12V and built to the same ANSI standard.
Both the H5001 and H5006 are sealed beam units, meaning the lens, reflector, and filament form a single assembly. When the filament fails, the entire unit requires replacement rather than an internal bulb swap.
The high beam and low beam units are not interchangeable with each other, as they differ in shape and physical size, with the H5001 being square and the H5006 being round.
The ANSI standardization of both units means they conform to a defined specification shared across the US and Canadian markets, which generally allows equivalent sealed beams from different manufacturers to serve as direct replacements provided they carry the same H-code designation.