A roller link constitutes the inner assembly of a chain, composed of two bushings press-fit into each of the link plates. In instances where rollers are present, they are included as part of the assembly. Notably, roller links are universal and are utilized for both single and multiple strand chains, regardless of their configuration.

Offset links, also referred to as ½ links or crank links, serve the purpose of adjusting the length of a chain to an odd number of pitches, often utilized for shortening a chain by one pitch. These links come in two primary configurations:

1. **Single-Pitch Offset Links (Slip-Fit Type):** These links are provided with a slip-fit pin that comes unassembled in the linkplates. A flat is milled on one end of the pin to prevent it from turning in the linkplate once installed. This design allows for flexibility in installation and adjustment.

2. **Two-Pitch Offset Links (Press-Fit Type):** This type of offset link consists of an offset link and a roller link assembled together. The assembly is constructed with a press-fit mechanism, significantly enhancing its structural rigidity, reliability, and durability compared to the single-pitch offset. The press-fit construction ensures a secure and stable connection between the link and the chain.

Although the two-pitch offset assembly offers superior performance and durability due to its press-fit construction, it’s worth noting that the use of offset links, regardless of type, is not recommended in performance-oriented drives due to the potential reduction in the chain’s working capacity. Offset links are typically employed in situations where precise length adjustments are necessary rather than in applications where maximum performance is paramount.

Connecting links serve the essential function of joining the two ends of a chain together, and they come in two primary configurations tailored to specific applications:

1. **Slip-Fit Links:** These are the most common and widely used connecting links. They facilitate easy assembly by allowing the cover plate to slip over the pin ends. However, this slip-fit construction does not offer the same level of integrity as an assembled chain. Consequently, it can reduce the working load capacity of the chain by up to 30%. Slip-fit links are typically employed in general chain applications where ease of assembly is prioritized over maximum load capacity.

2. **Press-Fit Connecting Links:** This configuration is utilized when the integrity of the connecting link must match that of the base chain. The design involves pitch holes in the cover plate that are slightly smaller than the chain pins, requiring the user to press the cover plate onto the pins before installing the spring clip or cotter. While this type of connection is more challenging to install, it provides the highest load-carrying capability and ensures the reliability and durability of the chain assembly. Press-fit connecting links are preferred in applications where maximum load capacity is essential and where the integrity of the connection must be maintained under rigorous operating conditions.

Riveted chain is constructed using pins that extend through the plate on each side and are then riveted, or sidemashed, on their ends to add some additional strength to the hold between the pin and plate. Note: the riveting, or sidemashing, is NOT what holds the pin and plate together. The interference fit between the plate hole size and the pin diameter hold the two together.
Cottered chain is constructed using pins that extended through one plate and are sidemashed and through the second side a further distance than through the first plate, with a cross-drilled hole for inserting a cotter pin. Note: cottered chain is also manufactured using an interference fit between the plate hole size and pin diameter. However, the plate is easier to remove following removal of the cotter, because grinding of the riveted pin end is not necessary.