Key, Steel, (60 mm Long), Pfeiffer, DUO, Part# 220006

This is a small, rectangular piece of steel. Its part number is 220006. It measures 60 mm in length. In mechanical engineering, this is called a “machine key” or simply a “key” .

Think of it like a small block that fits into special grooves. One groove is on a rotating shaft. Another groove is on a wheel, gear, or other part that needs to spin with that shaft. You place the key in between, and it locks the two parts together.

This steel key is made specifically for one pump model:

• Pfeiffer DUO 255M (Index C) 

If you own this pump and are doing any repair work that involves the rotating assembly, you may need this key. It is a critical part of the drive train.