This heavy-duty recoil tension spring is tailored for the 85-ton CAT E385C large excavator. Made of premium high-tensile steel with professional heat treatment, it delivers ultra-strong elasticity and excellent anti-fatigue capacity. It steadily buffers severe walking shocks, maintains accurate track tension and prevents track loosening or derailment. Adhering to OEM standards, it supports easy installation and customizable sizes for mining heavy-duty operations.