This is a list of the most common Caterpillar original part numbers in ascending order, and their corresponding aftermarket equivalent. Please note, most engine anodes are produced in zinc.
This is a brass plug with hex head and 1/4″ GAS or BSP thread. Fits pencils with 1/4″UNC thread
This is a brass plug with square head and thread 1/2″ GAS or BSP. Fits anodes with 3/8″ UNC thread
This is a brass plug with square head and 3/8″ GAS or BSP thread. Fits pencils with thread 5/8″UNF
This is a square head brass plug with 3/8″ GAS or BSP thread. Fits pencil anodes with 3/8″ UNC thread
This is a square head brass plug with 3/8″ BSPT thread. Fits pencil anodes with 7/16″ UNC thread
6L2281 is our part 02027 or 02029
02027 is a zinc pencil with 3/8″ UNC thread so if you have existing plugs please check if it needs 3/8″ UNC or the older type with 7/16″ UNC.
02029 is a zinc pencil with 7/16″ UNC. Length 38mm
This is a brass plug with square head and 1/4″ BSPT thread. Fitz pencils with thread 1/4″ UNC
Brass plug with square head and 1-1/4″ BSPT. Fits zinc pencil with thread 3/4″ UNC
Caterpillar Engine Guides
We have collated lists of anodes required for certain model types. Please note that while we’ve taken care to verify these with as many customers as possible, there is always the odd one with a slightly different configuration, so it’s always best to check against your manual or against the physical engine wherever possible.