Reading a Cummins supersession chain

Cummins retires part numbers and issues replacements all the time. The catalog behind this site holds 12,815 such records. Here is how to read them, and what to order.

What a supersession is

When Cummins changes a part — a new material, a design fix, a consolidated variant — it usually gives the new part a new number and marks the old number as superseded by it. The old part is not recalled: whatever is already on shelves keeps its old number and stays saleable. From that date on, factories ship only the new number.

Reading the chain

Every part page here shows the chain newest first. The top number is the one that ships today. Each line below it shows a number that was replaced and the date it was replaced, from Cummins supersession records. A page can also list several older numbers that were all merged into one new part.

1. 5581141Latest number
2. 3646323Superseded 22 March 2023
3. 3646321Superseded 28 March 2014
4. 3646325Superseded 28 March 2014
5. 3646326Superseded 28 March 2014
6. 3811988Superseded 28 March 2014
7. … and 4 older numbers on the part page

Which number to order

• Quote the number you have. We map it to the chain and tell you what ships today.
• Both numbers may exist in stock. If the old number is still on a shelf, we say so; the price and the fit are the same unless the record says otherwise.
• A superseded number is not a wrong number. Old numbers on invoices, drawings and parts books remain the right way to identify the part.

What a supersession does not tell you

Supersession records say which number replaced which, and when. They do not say why, and they do not say whether the old part is still made. When a chain ends in a number that is itself out of production, we say so in the quote rather than guess.

Have a number that is not on the site? Request a quote and we look it up by hand.