Single-axis trackers rotate day and night to follow the sun, lifting yield by about 15%–25%, but their pivot and torque-tube joints endure repeated cyclic loads that are fatigue weak points for fasteners.
Trackers start, stop and reverse many times daily; bolts under alternating shear and bending easily relax and fail by fatigue. Lost preload degrades tracking accuracy and causes structure noise.
FASTKING supplied fatigue-resistant serrated flange bolts and lock nuts for pivot and torque-tube joints. The serrated flange forms a mechanical lock on the mating face; set torque plus thread adhesive suppress micro-loosening. Products were bench-validated for the fatigue condition across millions of cycles.
Trackers kept tracking accuracy and quiet operation for the whole life, with no re-torquing at critical joints and lower O&M cost.
Serrated flange bolt, lock nut, torque-tube joint bolt.