The International C112 uses a 198 bulb size for both front and rear turn signal applications. The replacement chart covers 1961 to 1962 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 International C112 uses the 198 bulb for both the front and rear turn signals across the 1961-1962 model years.
The 198 is an ANSI-standardized bulb type, meaning its specifications conform to a defined North American standard recognized in both the United States and Canada.
The 198 bulb follows a T5 form factor, which refers to a tubular miniature wedge-base design approximately 5/8 of an inch wide at its widest point.
A wedge-base bulb relies on the tension of the socket contacts gripping the glass base directly, rather than using a separate metal cap or bayonet pins for retention.
The 198 bulb operates at 12 volts, consistent with the standard electrical system voltage found in most automotive applications of that era.
At a rated output of 2 watts, the 198 is a low-power bulb, reflecting its role as a signaling light rather than an illumination source.
The Light Duty designation in the specifications indicates these fitments apply to the lighter-weight configuration of the C112, as opposed to heavier-duty variants.
The uniform use of the 198 bulb across both the front and rear turn signal positions means a single bulb type serves all four turn signal sockets on the vehicle.