a metal rod with a circular or rectangular cross-section a central hub that connects the axle to the wheel a hub bearing to reduce friction a mounting plate to attach the axle to the vehicle frame lug nuts to secure the wheel to the axle
axle which is a metal rod with a circular or rectangular cross-section axle which is a central hub that connects the axle to the wheel axle which is a hub bearing to reduce friction axle which is a mounting plate to attach the axle to the vehicle frame axle which has lug nuts to secure the wheel to the axle