Connecting Rods

What Is a Connecting Rod?

A connecting rod is the part of an engine that connects a piston to the crankshaft and transfers force from the former’s up-and-down motion into the rotational motion of the latter. At either end, connecting rods are bored to connect to their related components. At the top, the smaller bore connects the rod to the piston. At the bottom, the larger bore can be split in half to attach to the crankshaft.

There are four types of connecting rod:

• I-Beam: Widely used across production, I-beam rods are the most common type and feature high-strength steel while remaining light.
• H-Beam: Capable of withstanding bending and compressions, H-beam rods are used for high-power, low-speed engines that require durability.
• X-Beam: Lightweight and resistant to cracking, X-beam rods feature some of the traits of both I-beam and H-beam rods, ideal for racing.
• A-Beam: Strong and reliable, A-beam rods are commonly used for diesel engines thanks to their ability to withstand high torque.

Where Is the Connecting Rod in an Engine?

In an engine, the connecting rod can be found inside the engine block, located between the crankpin and the crosshead. Each cylinder in an engine has its own connecting rod. 

What Materials Are Connecting Rods Made Of?

Connecting rods are made from a variety of materials, including titanium, steel, and aluminium alloys. Most connecting rods are made of heat-treated steel to provide strength, with alloys such as carbon steel and microalloyed steel.

Aluminium alloys are typically used for applications that require a reduced weight, and titanium has high strength while being lightweight.

Get in Touch

If you want to find out more about Matara’s range of connecting rods in the UK, contact one of our experts or visit our handy technical hub for more information.