BUSHES
Bushes are made to achieve high wear resistance and are press-fitted to the link plates, or with locating shoulders providing a bearing surface for pin rotation
ROLLERS
Rollers are free to rotate over the bushings. When the chain engages with the sprocket, the rollers work as bearings and serve to reduce shock and wear.
When the chain is running on rails or wear strips, the rollers reduce rolling running friction on the chain
PINS
Pins are made to exact specifications for high strength, sturdiness and wear resistance and rigidly press-fitted to the link plates.
Pins resist shearing force through chain tension and rotate in the bushings, providing bearing surfaces when the chain articulates over a sprocket.
LINKS
Link plates are the component part receiving chain tension. The holes for press-fitted pins or bushings are accurately punched to maintain uniform pitch.