One of the most frequently asked questions for me is ”what are stub axle nuts and why have I been charged for them on my service”? Stub axle nuts are also often referred to as ‘one shot’ nuts.
Stub axle nuts hold the drum to the axle (not the wheel to the drum). They are oliptical in shape to lock on to the axle with the correct torque. Once fitted they should never be used again hence ”one shot”.
The two most common types of stub axle nuts on UK caravans are the Alko and the BPW types.