The Hino SG3320 high beam headlight uses an H4651 bulb size while low beam headlights require either H4656 or H4652 bulb sizes. The replacement chart covers vehicle production years spanning 1993 to 2004 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 Hino SG3320 uses H4651 sealed beam units for the high beam headlight across all listed model years from 1993 to 2004, making it the most consistently specified bulb type in these specifications.
The H4651, H4656, and H4652 are all ANSI-standardized 4x6-inch rectangular sealed beam units rated at 12V. In each case, the entire unit is replaced rather than an internal filament or capsule.
The H4652, used in the low beam position on the 1994 and 1995 model years, is a variant of the H4651. Despite their shared form factor, H4652 and H4651 are distinct part numbers and are not interchangeable without confirming the specific beam function each is designed to serve.
The low beam headlight position on the Hino SG3320 uses two different sealed beam types depending on the model year. The 1993 and 1998-2004 model years specify the H4656, while the 1994-1995 model years specify the H4652 instead.
The H4651 and H4656 share the same ANSI form factor, voltage rating, and physical housing size, but they are designated for different beam functions. Substituting one for the other would not conform to the original fitment specifications.
Because all three bulb types are sealed beam units, the optical element, reflector, and lens are integrated into a single assembly. Damage to any part of the unit requires full replacement of the sealed beam rather than a component-level repair.
The ANSI 4x6-inch rectangular sealed beam format is a standardized size used across multiple vehicle manufacturers, meaning physically compatible units from various brands may exist, though electrical and photometric conformance to the original specification should be confirmed before substitution.