DLE222 Prop bolts

This is the prop bolts for the DLE 222 twin, a large-displacement two-stroke petrol twin for very large scale models.

The part itself is the propeller bolts that clamp the propeller to the hub.

Why it is replaced: these are safety-critical fasteners that are subject to the full propeller load; they are replaced when corroded, stretched or if the threads are damaged.

Fitting note: Use a calibrated torque wrench, torque in a diagonal sequence and check the torque again before flight.