Cone Crusher Cone Crusher is used for crushing of ores and rocks, the advantages are reliable structure, high efficiency, easy-to-adjust and economical. The safety spring system is the overload protection device, which makes foreign material Improves servicing of the cone crusher head. This means less downtime, greater cost efficiency and increased safety for those performing the task. Jack screw locking nut. Designed specifically with maintenance and safety in mind, the jack screw lock nut simplifies the task of replacing the mantle of your crusher. Feb 19, 2017 Cone Crusher MANTLE. The Mantalloy head mantle of this cone crusher is a replaceable wearing surface. It is made of alloyed manganese steel, and is held in place with a self-tightening head nut. On the 51-in. Hydrocone crushers and larger, the bottom portion of the mantle is ground to gauge to fit the head center, and the top portion is zinced.