The Hino SG3323 high beam headlight uses an H4651 bulb size while low beam headlight applications require either H4656 or H4652 bulb sizes. The replacement chart covers vehicle production years spanning 1993 to 1995 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 H4651 and H4656 are the most frequently specified bulb types across the Hino SG3323 headlight positions, each appearing in two of the three model years covered.
Both the H4651 and H4656 conform to ANSI standards recognized in the United States and Canada, and both are 4x6-inch rectangular sealed beam units operating at 12V.
The H4652, specified for the 1994 low beam position, is an ANSI-standard 4x6-inch rectangular sealed beam unit and is described as a variant of the H4651.
All three bulb types, H4651, H4656, and H4652, are sealed beam units, meaning the lens, reflector, and filament form a single assembly that is replaced as a whole rather than as an individual bulb.
The high beam position on the Hino SG3323 uses the H4651 consistently across 1993-1995, while the low beam position varies, with the H4656 specified for 1993 and 1995 and the H4652 specified for 1994.
Because the H4652 is a variant of the H4651 rather than an identical unit, substituting one for the other in the low beam position warrants attention to ANSI variant distinctions, as sealed beam variants within the same family can differ in filament placement or light distribution patterns.