Flange Yok and Holders Casting

The castings in the image are flange yokes and cross holders, which are components of a universal joint assembly. 

These parts are crucial in power transmission systems, particularly in automotive and heavy machinery, where they connect shafts that are not in perfect alignment. The flange yoke has a flat, disc-like flange with bolt holes for secure mounting to other drivetrain components like a differential or transmission. The yoke itself is a U-shaped design that connects to a cross holder. 

The cross holder, often called a cross or spider, has four arms (trunnions) that are fitted with needle bearings and connect the two yokes, enabling the flexible movement required to transmit torque at an angle. These components are typically made from durable materials like high-strength steel or cast iron to withstand mechanical stress and high torque loads. 

The cross holders are mainly cast inEN 19 steel, as it is a high-quality, chromium-molybdenum alloy steel known for its high tensile strength, toughness, and good shock and abrasion resistance. This makes it a suitable material for manufacturing components for the automotive industry, heavy machinery, and general engineering purposes.