Straight side plate chain is a type of roller chain that is commonly used in industrial applications such as conveyors, processing equipment, and automotive assembly lines. It is called "straight side plate" because the plates that connect the rollers are flat and parallel to each other, as opposed to having angled or curved sides.

This type of chain is designed to transmit power and motion efficiently and reliably, even under heavy loads and high speeds. It consists of a series of rollers connected by side plates, which are in turn connected to each other by pins. The rollers engage with teeth on sprockets, transmitting rotational power from one shaft to another.

Straight side plate chain comes in various sizes and configurations to accommodate different loads and speeds. It may be made of various materials such as carbon steel, stainless steel, or plastic, depending on the application requirements.