Z-42150 Clevis

Common Faults During Long-Term Service & Root Causes
Field operation records show three typical failure modes of Z-42150 clevis：
Fatigue cracks & sudden fracture
Alternating tension from wind, ice and line vibration creates cyclic loads on the bracket. Micro fatigue cracks gradually expand over years of operation, and continuous use will eventually lead to complete breakage;
Permanent plastic deformation
Long-term high-temperature exposure weakens the mechanical performance of steel substrates. When sustained heavy load acts on the softened plate, irreversible bending deformation occurs;
Electrochemical galvanic corrosion
When the clevis contacts dissimilar metal fittings, galvanic cells form at contact surfaces. The zinc coating acts as a sacrificial anode and corrodes first, accelerating rust damage to the whole fitting

Outstanding Product Advantages for Heavy-Duty & Corrosive Projects
Super high 420kN breaking load for ultra-high voltage lines
This is our top-load Z series clevis, perfectly matched for large cross-section conductors on ±800kV DC and 1000kV AC tension towers. It bears combined loads from heavy ice and strong wind, becoming the primary hardware choice for UHV transmission projects;
Thickened anti-corrosion zinc layer ≥86 μm
Compared with standard thin galvanized fittings, the dense 86μm+ zinc alloy layer provides outstanding salt fog resistance, fully adapting to coastal, chemical industrial and other highly corrosive working zones

Wide universal matching performance
Standard slot interface fits all national standard bowl-head hangers and insulator string sets; two bolt matching options (M22 / M42 high-strength bolts) satisfy both medium-voltage and UHV heavy-load assembly demands

Low-Temperature Usage Solution (Minus 40°C Extreme Cold Environment)
Under normal ambient temperature, carbon steel Z-42150 works stably. At -40°C, steel tensile and yield strength rise while ductility drops sharply, greatly increasing brittle fracture risk, so standard carbon steel versions are not recommended for frigid plateau zones;
If your project must deploy fittings under -40°C low temperature, we provide customized 35CrMo low-temperature alloy structural steel. After professional heat treatment, this material gains higher fatigue resistance and low-temperature impact toughness to avoid cold brittle cracking

Standard Installation Guidelines to Avoid Eccentric Load Damage
Eccentric load caused by improper assembly is the most frequent trigger of plate deformation and cracks. Follow these two key rules during installation：
Confirm force bearing direction
The two right-angle sides of the clevis correspond to longitudinal tension direction and transverse fixed direction separately. Check flatness of matched insulator and clamp contact surfaces;grind off bumps and deformations before assembly to eliminate uneven stress points

Strict three-dimensional alignment control
Horizontal angular deviation ≤0.5°, vertical angle kept at 90° ±0.5°. Ensure all hole axes are fully aligned to prevent bolts from bearing offset side force and causing concentrated stress on hole walls