Of all the components that make up this Kurbelwelle & Kolben the Nut(2rh) has the lowest price.
A sample from the products for the Kurbelwelle & Kolben include: Pin, Clevis(30x), Pin, Dowel (5h0), Washer, Plate(4gy), Gear, Drive.
In this schematic the "Spring, Compression (5y1)" is used most often.