Locking devices and components for wear assemblies for securing a wear part to the blade or lip of an excavator. The wear part will usually be a tooth adaptor, and when placed on the blade both parts determine a channel where the locking device is placed. The locking device will usually include a C-clamp member for mounting in the rearward of the channel, a front structure to engage to the frontward of the channel and a wedge structure placed between the C-clamp member and the front structure.