Wire Rope Tensile Grades 1770, 1960 and 2160 Explained

Understand steel wire rope tensile grades 1770, 1960 and 2160 N/mm2, how they determine breaking force and fatigue resistance, and how CML SARL in Douala supplies certified ropes matching your equipment specification.

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When ordering or inspecting steel wire rope in Cameroon, one of the most critical figures on the mill test certificate is the nominal tensile grade of the outer and inner wires. Expressed in megapascals (MPa) or newtons per square millimetre (N/mm²), common rope grades include 1770, 1960 and 2160. Selecting the right tensile grade is a precise engineering balance between ultimate breaking strength, wire ductility, bending fatigue endurance and sheave wear. At CML SARL (Cameroon Maritime Logistics), we supply certified steel wire ropes across Cameroon and Central Africa manufactured to international standards such as EN 12385 and ISO 2408. Understanding wire tensile grades ensures your maintenance team never compromises on crane safety or operational lifespan. ### What Does the Tensile Grade Represent? The tensile grade denotes the nominal tensile strength of the cold-drawn high-carbon steel wires that compose the strands. A grade 1960 rope uses wire with an average tensile strength around 1960 N/mm² (approximately 200 kg/mm²). High tensile strength is achieved through precise metallurgy—typically carbon content between 0.65% and 0.85%—followed by patenting heat treatment and progressive cold drawing through tungsten carbide dies. Standards specify both the nominal grade and acceptable tolerance bands for individual wire tensile tests before stranding. ### Comparison of Wire Rope Tensile Grades | Tensile Grade | Typical Strength (N/mm²) | Key Characteristics | Common App...